FLUKE AUTORANGING COMBISCOPE PM3370A (02) PDF MANUAL

These servicing instructions are for use by qualified personnel only. To reduce the risk of electric shock do not perform any servicing other than that contained in the operating instructions unless you are fully qualified to do so.

For measurements in the primary circuit, the use of an isolating transformer is strongly recommended. If no isolating transformer is used, all measurements in the primary circuit must be carried out with floating measuring instruments.

Before starting any test procedure, perform the following preliminary checks and settings:

1. Read the Safety chapter.

2. Disconnect all probes and cables from the instrument.

3. Connect the instrument to the mains, using a three-wire mains cord and switch on the instrument.

4. Press AUTOSET.

5. Select ANALOG mode by pressing the most right softkey and then softkey A. Display: ANALOG.

6. Press CAL SETUPS, and then select DEFAULT SETTINGS. Press RETURN.

7. Press DISPLAY, select VECTORS DOTS, then DOTS JOIN OFF. Press RETURN.

8. For digital mode: Press ACQUIRE and select ENVELOPE OFF.

1. Check the input voltage selector setting (if fitted).

2. Connect the instrument to the specified mains voltage.

3. Measure the mains voltage at the instrument and check that the mains voltage variation is within the specified limits.

1. Apply a signal of 1 Vpp, 1 kHz via a 50 Ohm coax cable to CH1.

2. Press AUTOSET.

3. Check: the instrument should display a stable trace.

4. Remove the signal from CH1 and apply it to CH2.

5. Press AUTOSET.

6. Check: the instrument should display a stable trace.

7. For 4-channel instruments: Repeat steps 4 through 6 for CH3 and CH4.

1. Center the trace with the POSITION controls.

2. Check that the horizontal trace is parallel with the horizontal graticule lines (within 0.1 div).

3. Apply a signal of 5 Vpp, 100 kHz to CH1.

4. Adjust the AMPL/DIV and POSITION controls for a display of 8 divisions.

5. Check that the vertical trace is parallel with the vertical graticule lines (within 0.1 div).

1. Center the trace with the POSITION controls.

2. Use the POSITION controls to move the trace over the full screen area.

3. Check that the trace remains parallel to the horizontal center line within 0.1 div and that trace thickness variation is minimal.

1. Apply a calibrated voltage from the calibrator unit set to 2mV DC to CH1.

2. Select CH1, 2mV/div.

3. Select GND coupling.

4. Center the trace on the horizontal center line using the position control.

5. Select DC coupling.

6. Check: The deflection should be 1.0 div +/- 0.03 div (1.5%).

7. Repeat steps 1 to 6 for the settings listed in the table below, using the appropriate CH1 settings and calibrator output.

8. Repeat steps 1 to 7 for CH2.

9. For 4-channel instruments: Repeat steps 1 to 7 for CH3 and CH4.

Calibrator Output	AMPL/DIV Setting	Required Deflection
2 mV DC	2 mV/div	1.0 div +/- 0.03 div
5 mV DC	5 mV/div	1.0 div +/- 0.03 div
10 mV DC	10 mV/div	1.0 div +/- 0.03 div
20 mV DC	20 mV/div	1.0 div +/- 0.03 div
50 mV DC	50 mV/div	1.0 div +/- 0.03 div
0.1 V DC	0.1 V/div	1.0 div +/- 0.03 div
0.2 V DC	0.2 V/div	1.0 div +/- 0.03 div
0.5 V DC	0.5 V/div	1.0 div +/- 0.03 div
1 V DC	1 V/div	1.0 div +/- 0.03 div
2 V DC	2 V/div	1.0 div +/- 0.03 div
5 V DC	5 V/div	1.0 div +/- 0.03 div

1. Apply a DC voltage from the calibrator unit of 5 V to CH1.

2. Select CH1, 5V/div.

3. Select GND coupling.

4. Center the trace on the horizontal center line using the position control.

5. Select DC coupling.

6. Check: The deflection should be 1.0 div +/- 0.03 div.

7. Press VERT MENU and select VAR ON.

8. Rotate the VAR knob fully counterclockwise.

9. Check: The deflection must be less than 0.4 div (factor 2.5 attenuation).

10. Repeat steps 1 to 9 for CH2.

11. For 4-channel instruments: Repeat steps 1 to 9 for CH3 and CH4.

1. Apply a DC voltage from the calibrator unit of 5 V to CH1.

2. Select CH1, 5V/div.

3. Select DC coupling.

4. Center the trace on the horizontal center line using the position control.

5. Check: The deflection should be 1.0 div +/- 0.03 div.

6. Select AC coupling.

7. Check: The trace must return to the horizontal center line +/- 0.1 div.

8. Repeat steps 1 to 7 for CH2.

9. For 4-channel instruments: Repeat steps 1 to 7 for CH3 and CH4.

1. Apply a DC voltage from the calibrator unit of 5 V to CH1.

2. Select CH1, 1V/div.

3. Select DC coupling.

4. Center the trace on the horizontal center line using the position control.

5. Select GND coupling.

6. Press CURSORS, select HORIZ ON, and then select CH1.

7. Using the POS knob corresponding to CH1, position the upper cursor on the trace (0V).

8. Select DC coupling.

9. Using the POS knob corresponding to CH1, position the lower cursor on the trace (5V).

10. Check: The readout ΔV should be 5.00 V +/- 0.18 V (3% of 6 div + 0.1% of 5V).

11. Repeat steps 1 to 10 for CH2.

12. For 4-channel instruments: Repeat steps 1 to 10 for CH3 and CH4.

1. Apply a sinusoidal signal of 6 div, 50 kHz from the generator via a 50 Ohm load to CH1.

2. Select CH1, AC coupling, 50 Ohm input impedance.

3. Adjust the AMPL/DIV setting to obtain exactly 6 div deflection.

4. Change the generator frequency to the specified bandwidth (e.g., 100 MHz for PM338xA/9xA). Do not change the generator output level.

5. Check: The deflection must be greater than 4.2 div (-3 dB).

6. Select 1 MOhm input impedance. Remove the 50 Ohm load.

7. Apply a sinusoidal signal of 6 div, 50 kHz from the generator to CH1.

8. Adjust the AMPL/DIV setting to obtain exactly 6 div deflection.

9. Change the generator frequency to the specified bandwidth. Do not change the generator output level.

10. Check: The deflection must be greater than 4.2 div (-3 dB).

11. Repeat steps 1 to 10 for CH2.

12. For 4-channel instruments: Repeat steps 1 to 10 for CH3 and CH4.

1. Apply a sinusoidal signal of 6 div, 50 kHz from the generator to CH1.

2. Select CH1, AC coupling.

3. Adjust the AMPL/DIV setting to obtain exactly 6 div deflection.

4. Change the generator frequency to 5 Hz. Do not change the generator output level.

5. Check: The deflection must be greater than 4.2 div (-3 dB).

6. Repeat steps 1 to 5 for CH2.

7. For 4-channel instruments: Repeat steps 1 to 5 for CH3 and CH4.

Test at 15/25/50 MHz:

1. Apply a sinusoidal signal of 8 div, 50 kHz from the generator to CH1.

2. Select CH1, AC coupling, 5mV/div.

3. Center the signal vertically.

4. Set the frequency to the specified value (15 MHz for PM3370A, 25 MHz for PM3380A/90A, 50 MHz for PM338xA/9xA).

5. Check: The signal displayed should be free of visible distortion and have an amplitude of at least 8 div.

6. Repeat steps 1 to 5 for CH2.

7. For 4-channel instruments: Repeat steps 1 to 5 for CH3 and CH4.

Test at 60/100/200 MHz:

1. Apply a sinusoidal signal of 8 div, 50 kHz from the generator to CH1.

2. Select CH1, AC coupling, 10mV/div.

3. Center the signal vertically.

4. Set the frequency to the specified value (60 MHz for PM3370A, 100 MHz for PM3380A/90A, 200 MHz for PM338xA/9xA).

5. Check: The signal displayed should be free of visible distortion and have an amplitude of at least 8 div.

6. Repeat steps 1 to 5 for CH2.

7. For 4-channel instruments: Repeat steps 1 to 5 for CH3 and CH4.

1. Select CH1, GND coupling.

2. Center the trace on the horizontal center line.

3. Use the POSITION control to shift the trace fully upwards and downwards.

4. Check: The trace position range must be at least +/- 4 div from the center line for 2mV/div to 0.2V/div settings, and +/- 8 div from the center line for 0.5V/div to 5V/div settings.

5. Repeat steps 1 to 4 for CH2.

6. For 4-channel instruments: Repeat steps 1 to 4 for CH3 and CH4.

1. Apply a sinusoidal signal of 8 div at the specified frequency (60 MHz for PM3370A, 100 MHz for PM3380A/90A, 200 MHz for PM338xA/9xA) to CH1.

2. Select CH1 and CH2, 10mV/div, AC coupling.

3. Use POSITION controls to superimpose the traces.

4. Set CH1 to OFF.

5. Check: The amplitude of the signal displayed on CH2 must be less than 0.16 div (2%).

6. Repeat steps 1 to 5 for CH1 caused by CH2.

7. For 4-channel instruments: Repeat for all channel combinations (CH1/CH3, CH1/CH4, CH2/CH3, CH2/CH4, CH3/CH4 and vice versa).

Test at 1 MHz:

1. Apply a sinusoidal signal of 1 Vpp, 1 MHz from the generator to both CH1 and CH2 via two matched 10:1 probes.

2. Select CH1 and CH2, 50mV/div, DC coupling.

3. Press VERT MENU, select ADD ON.

4. Check: The amplitude of the displayed signal must be less than 1 div (CMRR > 20 dB or 10:1).

5. For 4-channel instruments: Repeat steps 1 to 4 for CH3 and CH4.

Test at 50 MHz:

1. Apply a sinusoidal signal of 1 Vpp, 50 MHz from the generator to both CH1 and CH2 via two matched 10:1 probes.

2. Select CH1 and CH2, 50mV/div, DC coupling.

3. Press VERT MENU, select ADD ON.

4. Check: The amplitude of the displayed signal must be less than 1 div (CMRR > 20 dB or 10:1).

5. For 4-channel instruments: Repeat steps 1 to 4 for CH3 and CH4.

1. Apply a signal from the LF linearity generator (e.g., Tektronix TG501 staircase output) to CH1.

2. Select CH1, DC coupling.

3. Adjust AMPL/DIV and POSITION controls for a display amplitude of 8 div, centered vertically.

4. Check: The steps must be equally spaced within 0.1 div.

5. Repeat steps 1 to 4 for CH2.

6. For 4-channel instruments: Repeat steps 1 to 4 for CH3 and CH4.

1. Apply a fast-rise pulse signal (Tr < 2 ns) of approx. 4 div amplitude from the pulse generator via a T-adaptor to CH1 and EXT trigger input.

2. Select CH1, trigger source EXT, DC coupling.

3. Adjust AMPL/DIV, TIME/DIV, trigger LEVEL, and POSITION controls for a stable display showing the leading edge.

4. Check: The leading edge must be clearly visible before the trigger point (approx. 1 div).

5. Repeat steps 1 to 4 for CH2.

6. For 4-channel instruments: Repeat steps 1 to 4 for CH3 and CH4.

1. Select CH1, GND coupling.

2. Center the trace.

3. Set AMPL/DIV to 2mV/div.

4. Check: Any baseline instability (noise, ripple, drift) must be less than 0.4 div.

5. Repeat steps 1 to 4 for CH2.

6. For 4-channel instruments: Repeat steps 1 to 4 for CH3 and CH4.

1. Apply a fast-rise pulse signal (Tr < 2 ns) via a power splitter and two matched cables to CH1 and CH2.

2. Select CH1 and CH2, DC coupling, 10mV/div.

3. Select TIME/DIV 1ns/div.

4. Press MAGNIFY and center the leading edges horizontally.

5. Superimpose the two traces vertically.

6. Check: The time difference between the 50% points of the leading edges must be less than 2ns (2 div at 1ns/div).

7. For 4-channel instruments: Repeat steps 1 to 6 for channel combinations CH1/CH3, CH1/CH4, CH2/CH3, CH2/CH4.

1. Select CH1, GND coupling.

2. Center the trace vertically and horizontally.

3. Press DELAYED TB, select DTB ON.

4. Use the POS control for the MTB trace and the DELAY control for the DTB trace to position the MTB trace 2 divisions above the center line and the DTB trace 2 divisions below the center line.

5. Check: Trace separation must be at least 4 div.

6. Press DELAYED TB, select MAIN TB.

Via CH1:

1. Select ANALOG mode.

2. Press DISPLAY, select XY MODE ON.

3. Apply a DC voltage of 1 V from the calibrator to CH1.

4. Select CH1, GND coupling.

5. Center the dot horizontally.

6. Select DC coupling.

7. Check: The horizontal deflection must be 10 div +/- 0.5 div (5%).

Via Line:

1. Select ANALOG mode.

2. Press TRIGGER, select SOURCE LINE.

3. Press DISPLAY, select XY MODE ON.

4. Check: The horizontal deflection must be > 4 div.

1. Apply time marks of 1 ms from the time mark generator to CH1.

2. Select CH1, trigger source CH1, trigger coupling DC.

3. Set TIME/DIV to 1ms/div.

4. Adjust trigger LEVEL for a stable display.

5. Center the display horizontally.

6. Check: The distance between time marks must be 1.0 div +/- 0.03 div (3%).

7. Repeat steps 3 to 6 for all TIME/DIV settings using the appropriate time marks as listed in the table below.

Time Marks	TIME/DIV Setting	Required Distance
1 s	1 s/div	1.0 div +/- 0.03 div
0.5 s	0.5 s/div	1.0 div +/- 0.03 div
0.2 s	0.2 s/div	1.0 div +/- 0.03 div
0.1 s	0.1 s/div	1.0 div +/- 0.03 div
50 ms	50 ms/div	1.0 div +/- 0.03 div
20 ms	20 ms/div	1.0 div +/- 0.03 div
10 ms	10 ms/div	1.0 div +/- 0.03 div
5 ms	5 ms/div	1.0 div +/- 0.03 div
2 ms	2 ms/div	1.0 div +/- 0.03 div
1 ms	1 ms/div	1.0 div +/- 0.03 div
0.5 ms	0.5 ms/div	1.0 div +/- 0.03 div
0.2 ms	0.2 ms/div	1.0 div +/- 0.03 div
0.1 ms	0.1 ms/div	1.0 div +/- 0.03 div
50 us	50 us/div	1.0 div +/- 0.03 div
20 us	20 us/div	1.0 div +/- 0.03 div
10 us	10 us/div	1.0 div +/- 0.03 div
5 us	5 us/div	1.0 div +/- 0.03 div
2 us	2 us/div	1.0 div +/- 0.03 div
1 us	1 us/div	1.0 div +/- 0.03 div
0.5 us	0.5 us/div	1.0 div +/- 0.03 div
0.2 us	0.2 us/div	1.0 div +/- 0.03 div
0.1 us	0.1 us/div	1.0 div +/- 0.03 div
50 ns	50 ns/div	1.0 div +/- 0.03 div
20 ns	20 ns/div	1.0 div +/- 0.03 div
10 ns	10 ns/div	1.0 div +/- 0.03 div
5 ns	5 ns/div	1.0 div +/- 0.03 div

1. Apply time marks of 1 ms from the time mark generator to CH1.

2. Select CH1, trigger source CH1, trigger coupling DC.

3. Set TIME/DIV to 1ms/div.

4. Adjust trigger LEVEL for a stable display.

5. Center the display horizontally.

6. Press TIME/DIV, select VAR ON.

7. Rotate the VAR knob fully counterclockwise.

8. Check: The distance between time marks must be < 0.4 div (attenuation > 2.5).

1. Apply time marks of 1 ms from the time mark generator to CH1.

2. Select CH1, trigger source CH1, trigger coupling DC.

3. Set TIME/DIV to 1ms/div.

4. Adjust trigger LEVEL for a stable display.

5. Press CURSORS, select VERT ON, select TRACK ON.

6. Using the X POS knob, position the left cursor on the third time mark from the left.

7. Using the DELAY knob, position the right cursor on the eighth time mark from the left (5 marks difference).

8. Check: The readout Δt must be 5.00 ms +/- 0.18 ms (3% of 6 div + 0.1% of 5ms).

1. Apply time marks of 10 ns from the time mark generator to CH1.

2. Select CH1, trigger source CH1, trigger coupling DC.

3. Set TIME/DIV to 5ns/div.

4. Press DELAYED TB, select DTB ON.

5. Set DTB speed using the TIME/DIV knob to 5ns/div.

6. Adjust trigger LEVEL and DELAY controls for a stable display of the delayed trace.

7. Center the display horizontally.

8. Check: The distance between time marks on the DTB trace must be 2.0 div +/- 0.08 div (4%).

9. Repeat step 5 to 8 for all DTB TIME/DIV settings using the appropriate time marks (use 2 div distance).

1. Apply time marks of 1 ms from the time mark generator to CH1.

2. Select CH1, trigger source CH1, trigger coupling DC.

3. Set MTB TIME/DIV to 1ms/div.

4. Press DELAYED TB, select DTB ON.

5. Set DTB speed using the TIME/DIV knob to 0.1ms/div.

6. Adjust trigger LEVEL for a stable display.

7. Set the DELAY control so that the first time mark is intensified or displayed on the DTB trace at the first vertical graticule line.

8. Read the delay time from the display (e.g., Td1).

9. Rotate the DELAY control so that the 10th time mark is positioned at the first vertical graticule line.

10. Read the delay time from the display (e.g., Td2).

11. Check: The difference Td2 – Td1 must be 9 ms +/- 0.27 ms (3%).

1. Apply a signal of 10 MHz from the generator to CH1.

2. Select CH1, trigger source CH1, trigger coupling DC.

3. Set MTB TIME/DIV to 1us/div.

4. Press DELAYED TB, select DTB ON.

5. Set DTB speed using the TIME/DIV knob to 20ns/div.

6. Adjust trigger LEVEL and DELAY controls for a stable display of the delayed trace.

7. Set DELAY control fully clockwise (maximum delay).

8. Check: Horizontal jitter on the DTB trace must be less than 0.1 div (1:20,000).

1. Apply a sinusoidal signal of 6 div, 50 kHz from the generator to CH1.

2. Select CH1, AC coupling.

3. Press DISPLAY, select XY MODE ON.

4. Adjust Y position and X gain (via AMPL/DIV CH1) for a horizontal display length of 10 div.

5. Set the generator frequency to 3 MHz.

6. Check: The horizontal display length must be > 7 div (-3 dB).

1. Apply a sinusoidal signal of 150 kHz from the generator via a power splitter and two matched cables to CH1 and CH2.

2. Select CH1 and CH2, AC coupling.

3. Press DISPLAY, select XY MODE ON (Y=CH2, X=CH1).

4. Adjust AMPL/DIV controls for CH1 and CH2 to obtain a Lissajous figure approximately 6 div high and 6 div wide.

5. Check: The phase shift (opening of the Lissajous ellipse) must be less than 3 degrees.

For PM3390A/3392A/3394A:

1. Apply a 50 kHz signal from the generator to CH1.

2. Select CH1, trigger source CH1, trigger coupling DC.

3. Set AMPL/DIV to 5mV/div.

4. Adjust generator output for a signal amplitude of 0.5 div.

5. Adjust trigger LEVEL for a stable trace.

6. Increase generator frequency to 50 MHz.

7. Check: The trace must remain stable.

8. Increase generator frequency to 300 MHz.

9. Adjust generator output for a signal amplitude of 2.0 div.

10. Adjust trigger LEVEL for a stable trace.

11. Check: The trace must remain stable.

12. Repeat steps 1-11 for CH2, CH3, CH4, and EXT (using EXT input).

For PM3370A/3380A/3382A/3384A:

1. Apply a 50 kHz signal from the generator to CH1.

2. Select CH1, trigger source CH1, trigger coupling DC.

3. Set AMPL/DIV to 5mV/div.

4. Adjust generator output for a signal amplitude of 0.5 div.

5. Adjust trigger LEVEL for a stable trace.

6. Increase generator frequency to 30 MHz.

7. Check: The trace must remain stable.

8. Increase generator frequency to 150 MHz.

9. Adjust generator output for a signal amplitude of 2.0 div.

10. Adjust trigger LEVEL for a stable trace.

11. Check: The trace must remain stable.

12. Repeat steps 1-11 for CH2, CH3, CH4, and EXT (using EXT input).

1. Apply a TV test signal (composite video) from the TV generator to CH1.

2. Select CH1, trigger source CH1.

3. Press TRIGGER, select TVL trigger.

4. Adjust AMPL/DIV to 0.2V/div.

5. Adjust generator output for a signal amplitude of 0.5 div (top sync to bottom video).

6. Check: The trace must be stable.

7. Press TRIGGER, select TVF trigger.

8. Check: The trace must be stable.

9. Repeat steps 1-8 for DELAYED TB trigger (Press DELAYED TB, select DTB TRIG ON, repeat TVL/TVF selection within DELAYED TB menu).

For PM3390A/92A/94A:

1. Apply a 50 kHz signal from the generator to CH1.

2. Select CH1, trigger source CH1, trigger coupling DC.

3. Press DELAYED TB, select DTB TRIG ON, select source CH1, coupling DC.

4. Set AMPL/DIV to 5mV/div.

5. Adjust generator output for a signal amplitude of 0.5 div.

6. Adjust DTB trigger LEVEL for a stable DTB trace.

7. Increase generator frequency to 50 MHz.

8. Check: The DTB trace must remain stable.

9. Increase generator frequency to 300 MHz.

10. Adjust generator output for a signal amplitude of 2.0 div.

11. Adjust DTB trigger LEVEL for a stable DTB trace.

12. Check: The DTB trace must remain stable.

13. Repeat steps 1-12 for CH2, CH3, CH4, and EXT (using EXT input).

For PM3370A/80A/82A/84A:

1. Apply a 50 kHz signal from the generator to CH1.

2. Select CH1, trigger source CH1, trigger coupling DC.

3. Press DELAYED TB, select DTB TRIG ON, select source CH1, coupling DC.

4. Set AMPL/DIV to 5mV/div.

5. Adjust generator output for a signal amplitude of 0.5 div.

6. Adjust DTB trigger LEVEL for a stable DTB trace.

7. Increase generator frequency to 30 MHz.

8. Check: The DTB trace must remain stable.

9. Increase generator frequency to 150 MHz.

10. Adjust generator output for a signal amplitude of 2.0 div.

11. Adjust DTB trigger LEVEL for a stable DTB trace.

12. Check: The DTB trace must remain stable.

13. Repeat steps 1-12 for CH2, CH3, CH4, and EXT (using EXT input).

1. Apply a TTL level signal (0V to +5V) from the logic generator to CH1, CH2, CH3, CH4.

2. Select CH1, CH2, CH3, CH4. Set AMPL/DIV for all channels to 1V/div, DC coupling.

3. Press TRIGGER, select LOGIC trigger, select PATT ON.

4. Set pattern to HHHH (High for all channels).

5. Adjust POSITION controls to display all four traces.

6. Adjust trigger LEVEL for a stable display (should trigger on all high).

7. Check: The trigger should be stable.

8. Change the pattern to LLLL (Low for all channels).

9. Adjust trigger LEVEL for a stable display (should trigger on all low).

10. Check: The trigger should be stable.

11. Experiment with other patterns (e.g., HLHL, XHXH where X is don’t care) and check for stable triggering according to the set pattern.

1. Apply a TTL level signal (0V to +5V) from the logic generator to CH1 and CH2.

2. Select CH1 and CH2. Set AMPL/DIV for both channels to 1V/div, DC coupling.

3. Press TRIGGER, select LOGIC trigger, select PATT ON.

4. Set pattern to HH (High for both channels).

5. Adjust POSITION controls to display both traces.

6. Adjust trigger LEVEL for a stable display (should trigger on both high).

7. Check: The trigger should be stable.

8. Change the pattern to LL (Low for both channels).

9. Adjust trigger LEVEL for a stable display (should trigger on both low).

10. Check: The trigger should be stable.

11. Experiment with other patterns (e.g., HL, LH, XH, LX where X is don’t care) and check for stable triggering according to the set pattern.

1. Apply a square wave signal of 5 Vpp, 1 kHz from the generator to the Z-MOD input on the rear panel.

2. Select CH1, GND coupling.

3. Set TIME/DIV to 1ms/div.

4. Adjust INTENSITY control for a clearly visible trace.

5. Check: The trace should be intensity modulated (blanked during one half of the cycle).

6. Reduce the generator output level.

7. Check: Modulation should still be visible at 2.5 Vpp.

1. Connect the Probe Adjust output to CH1 using a 1:1 probe or coax cable.

2. Select CH1, DC coupling.

3. Press AUTOSET.

4. Check: The displayed signal should be a square wave.

5. Use cursors (Vertical and Time) to measure the amplitude and frequency.

6. Check: Amplitude must be 600 mVpp +/- 3%. Frequency must be 2 kHz +/- 1%.

1. Apply a signal of 1 Vpp, 1 kHz to CH1.

2. Select CH1.

3. Press AUTO RANGE (next to AMPL/DIV knob).

4. Check: The AUTO indicator should light up, and the display amplitude should remain relatively constant while varying the generator output between approx. 0.1 Vpp and 10 Vpp.

5. Press AUTO RANGE again to disable.

6. Press AUTO RANGE (next to TIME/DIV knob).

7. Check: The AUTO indicator should light up, and the number of displayed periods should remain relatively constant while varying the generator frequency between approx. 100 Hz and 1 MHz.

8. Press AUTO RANGE again to disable.

1. Switch on the instrument and allow 30 minutes for warm-up.

2. Press CAL SETUPS, then DEFAULT SETTINGS, then RETURN.

3. Press UTILITY, SERVICE, CALIBRATE. Enter the password (default is 3300). Press ENTER.

4. Follow the on-screen instructions for each calibration step (Dark Level, Trace Rotation, Horiz Gain/Offset, Text Stability, Vert Gain/Offset, Horiz Vector Gain/Offset, Vert Vector Gain/Offset, Astigmatism, Autocal, LF Square Wave Responses, HF Square Wave Response, HF Response DSO, Trigger Delay).

5. Use the specified input signals and make adjustments using the indicated controls (usually softkeys or POS knobs) as prompted by the calibration routine.

6. After completing all steps, select SAVE CAL DATA and press ENTER to store the new calibration constants.

7. Select TEST PERFORMANCE to verify calibration or EXIT SERVICE to return to normal operation.

1. Access the Calibration menu (UTILITY -> SERVICE -> CALIBRATE -> Enter password).

2. Select DARK LEVEL CRT.

3. Follow the on-screen instructions: Adjust using the softkeys until the trace is just visible.

4. Press DONE.

1. Access the Calibration menu.

2. Select TRACE ROTATION.

3. A horizontal trace appears.

4. Adjust the TRACE ROTATION trimmer on the front panel until the trace is parallel with the horizontal graticule lines.

5. Press DONE.

1. Access the Calibration menu.

2. Select HORIZ GAIN CRT and HORIZ OFFSET CRT.

3. Follow the on-screen instructions: Adjust using softkeys to align the trace ends/markers with the specified graticule lines.

4. Press DONE.

1. Access the Calibration menu.

2. Select TEXT STAB CRT and X OFFSET CRT.

3. Follow the on-screen instructions: Adjust using softkeys to center the text/marker horizontally.

4. Press DONE.

1. Access the Calibration menu.

2. Select VERT GAIN CRT and VERT OFFSET CRT.

3. Follow the on-screen instructions: Adjust using softkeys to align the trace ends/markers with the specified graticule lines.

4. Press DONE.

1. Access the Calibration menu.

2. Select HORIZ GAIN VECT, HORIZ OFFSET VECT, VERT GAIN VECT, VERT OFFSET VECT.

3. Follow the on-screen instructions for each: Adjust using softkeys to align the vector display/markers as indicated.

4. Press DONE after each adjustment.

1. Access the Calibration menu.

2. Select ASTIGMATISM.

3. Follow the on-screen instructions: Adjust using softkeys for the sharpest possible trace over the entire screen area, especially focusing on the center and corners.

4. Press DONE.

1. Access the Calibration menu.

2. Select AUTOCAL.

3. The instrument will automatically perform internal adjustments. This takes several minutes.

4. Wait until the procedure completes. A confirmation message will appear.

5. Press DONE.

1. Access the Calibration menu.

2. Connect the PROBE ADJUST output to the respective channel input (CH1, CH2, CH3, CH4) using a 1:1 probe.

3. Select the corresponding LF SQUARE WAVE RESPONSE adjustment (e.g., LF RESP CH1).

4. Follow the on-screen instructions: Adjust the corresponding trimmer capacitor (C4004 for CH1, C4034 for CH2, C4064 for CH3, C4104 for CH4) on the Signal Unit A1 for the flattest possible square wave top.

5. Repeat for EXT TRIG (LF RESP EXT TRIG) using trimmer C4134, connecting PROBE ADJUST to the EXT TRIG input.

6. Press DONE after each adjustment.

1. Access the Calibration menu.

2. Apply a 1 MHz square wave signal, approx. 6 div amplitude, to CH1.

3. Select HF RESP FINAL Y.

4. Follow the on-screen instructions: Adjust trimmer capacitor C1011 on the Final XYZ Amplifier unit A2 for optimal square wave response (minimal overshoot/undershoot, fast rise time).

5. Press DONE.

1. Access the Calibration menu.

2. Apply a 10 MHz square wave signal, approx. 6 div amplitude, to CH1.

3. Select HF RESP DSO MODE.

4. Select CH1 using softkeys.

5. Follow the on-screen instructions: Adjust using softkeys (UP/DOWN) for the flattest possible square wave top in the digital display mode.

6. Repeat steps 4-5 for CH2, CH3, and CH4.

7. Press DONE.

1. Access the Calibration menu.

2. Apply a fast-rise pulse (<1ns), approx. 4 div amplitude, to CH1.

3. Select TRIGGER DELAY.

4. Follow the on-screen instructions: Adjust using softkeys (UP/DOWN) until the trigger point aligns precisely with the start of the displayed pulse’s rising edge.

5. Press DONE.

1. After completing all necessary adjustments in the Calibration menu.

2. Select SAVE CAL DATA.

3. Press ENTER or the corresponding softkey to confirm.

4. Wait for the confirmation message that the data has been saved.

1. After saving calibration data, remain in the Calibration menu.

2. Select TEST PERFORMANCE.

3. Follow the on-screen instructions and connect signals as prompted. The instrument will perform a series of checks based on the new calibration data.

4. Observe the results displayed on screen. Address any failures by re-calibrating the specific failed parameter.

5. Alternatively, exit the service menu and perform the relevant checks from the Performance Test procedure (Section 6).

General Information:

Ensure the instrument is disconnected from the mains supply before removing any covers.

Be aware of static-sensitive components.

Removing the cabinet and carrying handle:

1. Place the instrument face down on a protective surface.

2. Remove the screws securing the rear feet/cabinet.

3. Remove the screws securing the handle stops.

4. Carefully slide the cabinet off towards the rear.

5. The carrying handle can be removed by detaching it from its mounting points.

Electronic components can be damaged by static discharges. Observe the following precautions when handling components and units:

1. Work in a static-safe environment.

2. Use a conductive wrist strap connected to earth.

3. Use conductive mats on benches and floors.

4. Handle PCBs by their edges.

5. Store and transport sensitive components in conductive bags or containers.

6. Use an ionized air blower if available.

7. Avoid touching component leads or PCB tracks.

1. Use a temperature-controlled soldering iron set to the appropriate temperature (typically 300-350°C for lead-based solder).

2. Keep the soldering iron tip clean and tinned.

3. Heat the component lead and PCB pad simultaneously.

4. Apply solder to the heated joint, not directly to the iron tip.

5. Use only enough solder to form a clean, shiny fillet.

6. Remove the iron quickly once the solder flows.

7. Allow the joint to cool without disturbance.

8. Clean flux residues if necessary.

9. Use appropriate desoldering tools (pump, braid) for component removal.

1. Use a soldering iron with a fine tip (e.g., 0.5mm to 1mm).

2. Exercise extreme caution regarding static discharge.

3. Use fine-gauge solder (e.g., 0.5mm).

4. Minimize heating time to avoid damaging the component (typically 2-3 seconds per lead).

5. Use magnification (e.g., magnifying lamp or microscope) to ensure proper alignment and solder joint quality.

6. For surface mount devices (SMDs), use appropriate techniques like hot air rework stations or specialized soldering tweezers if available.

7. Ensure correct orientation before soldering.

Gently pull the knobs straight off their shafts. Some knobs may have two parts (inner and outer) that need to be removed separately. Do not use excessive force or tools that could damage the knobs or front panel.

1. Identify the type of connector.

2. For connectors with locking levers/tabs: Gently release the levers or tabs on the sides of the connector housing.

3. For friction-fit connectors: Carefully pull the cable connector straight out of the socket, ensuring even pressure to avoid bending pins.

4. Note the orientation of the cable (usually indicated by a colored stripe or keying) for correct reassembly.

5. Do not pull on the ribbon cable itself, only the connector housing.

1. Remove the instrument cabinet.

2. Disconnect all relevant ribbon cables and coaxial connectors linking A1 to other units (A2, A3, A4, A6, A10).

3. Remove the screws securing the A1 unit shield or frame to the main chassis.

4. Carefully lift the A1 unit out of the chassis, being mindful of any remaining connections or obstructions.

1. Remove the instrument cabinet.

2. Discharge the CRT safely if necessary.

3. Disconnect the cable(s) connecting A2 to the CRT socket board (A2 sub-unit).

4. Disconnect ribbon cables connecting A2 to A1 and A3.

5. Remove the screws securing the A2 unit to the chassis or heat sink.

6. Carefully detach the A2 unit, noting the connection to the CRT socket.

This typically refers to the CRT socket PCB, which is part of the A2 unit.

1. Ensure the CRT high voltage is safely discharged.

2. Disconnect the cable linking the socket board to the main A2 board.

3. Carefully unplug the socket board straight off the CRT base pins. Avoid tilting or bending the pins.

Warning: Risk of implosion and high voltage. Only qualified personnel should perform this.

1. Safely discharge the CRT anode cap and any stored charge on the neck pins.

2. Remove the CRT socket board (A2 sub-unit).

3. Disconnect the anode high-voltage lead.

4. Remove the front bezel/graticule assembly.

5. Loosen and remove the CRT mounting clamps or straps securing the tube to the chassis.

6. Carefully slide the CRT out from the front or rear (depending on chassis design), supporting its weight. Handle with extreme care.

1. Remove the instrument cabinet.

2. Disconnect all ribbon cables connecting A3 to other units (A1, A2, A4, A6, A8, A10, options).

3. If present, disconnect the battery backup connection.

4. Remove the screws securing the A3 unit (often in a shielded enclosure) to the chassis.

5. Lift the A3 unit out.

A4 (Front Unit) and A5 (CRT Controls Unit):

1. Remove the instrument cabinet.

2. Remove all front panel rotary knobs.

3. Disconnect ribbon cables connecting A4 and A5 to A3 and A1.

4. Remove screws securing the front frame assembly to the main chassis.

5. Carefully detach the front frame assembly.

6. A4 and A5 are typically mounted within this frame. Remove screws securing the individual PCBs (A4, A5) to the front frame.

1. Remove the instrument cabinet.

2. Disconnect the mains input connector cable from A6.

3. Disconnect the output power cables/connectors linking A6 to other units (A1, A2, A3, etc., often via A10).

4. Remove the screws securing the A6 unit (usually enclosed in a metal shield) to the chassis floor or rear panel.

5. Lift the A6 unit out.

1. Remove the instrument cabinet.

2. Disconnect ribbon cables connecting A8 to A1 and A3.

3. Remove the screws securing the A8 unit (often in a shielded enclosure) to the chassis.

4. Lift the A8 unit out.

Use the original packaging material if available. If not, use a strong cardboard box with sufficient internal padding (foam, bubble wrap) to prevent movement and absorb shocks during transit. Ensure the front panel and CRT are well-protected. Seal the box securely.

1. Visual Inspection: Check for obvious damage, loose connections, burnt components, or blown fuses.

2. Power Supply Checks: Verify all supply voltages are present and within specification at various test points.

3. Signal Tracing: Use a known good oscilloscope or DMM to trace signals through the suspected faulty section, comparing with expected waveforms or voltages shown in circuit diagrams.

4. Unit Substitution: If available, swap suspect units (PCBs) with known good ones.

5. Built-in Diagnostics: Utilize the instrument’s self-tests and diagnostic routines (see Section 8.11).

6. Check Settings: Ensure user settings are not causing the apparent fault (e.g., trigger level, intensity, display mode).

7. Refer to Service Manual: Use schematics, signal lists, and descriptions in the PDF to understand circuit operation and identify test points.

1. Check the mains fuse located on the rear panel.

2. Verify mains voltage is reaching the input rectifier (V1001-V1004).

3. Check the DC voltage across the main filter capacitors C1008/C1009 (approx. 100-380V DC, depending on mains input). Warning: High voltage!

4. Check if the converter is oscillating. Look for switching waveforms on the primary side (e.g., at V1019 collector) or check for presence of secondary output voltages.

5. If no output voltages: check startup components (R1007, R1008), control circuit (V1016, V1019, V1014), and switching transistor V1019.

6. If output voltages are incorrect: check regulation feedback loop (opto-isolator H1046, voltage references, error amplifiers N1236, N1251), secondary rectifier diodes, and filter components.

7. Check protection circuits: Over/under-voltage (V1241, N1236), temperature (R1231, N1236), trigger thyristor V1213.

8. Check the EHT converter section (T1002, V1108, V1109, N1101) if CRT high voltages are missing or incorrect.

9. Check the +5V post-regulator (N1251, V1251, V1252, L1271).

Power-up test:

The instrument automatically performs a basic self-test upon power-up. Error messages may be displayed if critical failures are detected.

Introduction to diagnostic tests:

Access the service menu: Press UTILITY -> SERVICE -> (Enter password, default 3300) -> ENTER.

SELFTESTS:

Select SELFTESTS from the service menu. Choose the desired test category (e.g., RAM, ROM, Display, ADC, DAC, Keyboard). Follow any on-screen instructions. Results (PASS/FAIL) are typically displayed.

Repair tools:

Select REPAIR TOOLS from the service menu. This may offer options like displaying specific patterns, forcing outputs, or looping tests to aid in component-level troubleshooting. Follow on-screen instructions for the selected tool.

After any repair or maintenance involving the primary circuit, perform the following safety checks:

1. General Directions: Ensure all shields, covers, and safety components are correctly reinstalled.

2. Safety Components: Visually inspect all safety-critical components (fuse, mains input filter, isolation barriers, grounding connections) for damage or incorrect replacement.

3. Checking Protective Ground: Measure the resistance between the mains plug ground pin and exposed metal parts of the chassis using an Ohmmeter. Resistance should be very low (typically < 0.1 Ohm).

4. Checking Insulation Resistance: Measure the insulation resistance between the mains input lines (L and N tied together) and the protective ground pin, and between the mains input lines and accessible low-voltage secondary circuits/metal parts. Use a high-voltage insulation tester (Megohmmeter) set typically to 500V DC. Resistance should be very high (typically > 2 MOhm, consult specific standards).

5. Checking Leakage Current: Measure the leakage current from the mains input to ground using a specialized leakage current tester, under various fault conditions (e.g., open neutral) as specified by safety standards (e.g., IEC 60950, IEC 61010). Current limits are typically low (e.g., < 0.5 mA or < 3.5 mA depending on standard and equipment class).

6. Voltage Test (Hipot): Perform a high-voltage dielectric strength test between primary circuits and protective earth, and between primary and secondary circuits, according to relevant safety standards. Apply the specified AC or DC voltage (e.g., 1500V AC) for the specified time (e.g., 1 minute) and check for breakdown. Warning: High Voltage! Only perform if properly equipped and trained.

The calibration adjustment procedure can be split into two main types:

1. Manual adjustment: Requires external calibration equipment, protected by a keyword and seal, and should be performed by qualified personnel after 2000 service hours or once a year.

2. Automatic calibration (AUTOCAL): Activated by the front panel CAL key, requires no external equipment, and should generally be used once a week or after warming up in extreme conditions for maximum accuracy. AUTOCAL relies on correct manual adjustments.

All calibration should be done with the oscilloscope’s cabinet closed to eliminate inaccuracies due to temperature changes.

The calibration adjustment should be started after a warming-up time of 30 minutes. For the most accurate adjustments, use a well-focused low intensity display.

Calibration parameters are saved automatically after power-down if the memory back-up batteries are installed. Additionally, they can be saved into the instrument’s non-volatile memory by pressing the softkey ‘save calibr data’ and then activating the pin hole key. Note that the number of times this save action can be performed is limited (typically 10 times). When the memory is full, it needs to be cleared; refer to chapter 8 (corrective maintenance) for the procedure.

1. Press the STATUS and TEXT OFF keys simultaneously to set a defined instrument position.

2. Adjust MTB/VAR to 1.00 ms/div.

3. Select the key sequence ‘UTILITY > MAINTENANCE > ENTER KEYWORD’.

4. Enter the five-digit keyword ‘3 2 4 1 5’. If correct, it returns to the UTIL MAINTENANCE menu.

5. Press softkey MANUAL CALIBR.

6. Select ‘dark’ with the TRACK rotary.

7. Press softkey ‘analog’: the Δ sign appears behind ‘analog’.

8. Put the TRACE INTENSITY rotary in the minimal intensity position.

9. Adjust the Δ rotary so that the dot at the beginning of the CH1 trace is just invisible. Use X POS to move the trace start away from the ground level indicator.

10. Press softkey ‘digital’: the Δ sign appears behind ‘digital’.

11. Press the front panel key ‘ANALOG’ (message DIGITAL MODE appears briefly); the oscilloscope switches to digital mode.

12. Put the TRACE INTENSITY rotary in the minimal intensity position.

13. Adjust the Δ rotary so that the CH1 trace is just invisible.

14. Put TRACE INTENSITY rotary in a normal intensity position again.

15. Press softkey RETURN to go to the UTIL MAINTENANCE MENU.

1. Press the ANALOG key (message ANALOG MODE appears briefly) to switch the oscilloscope to analog mode.

2. Adjust the INTENS TRACE rotary for a well-visible horizontal trace on the screen.

3. Align the CH1 trace exactly parallel with the horizontal graticule lines using the screwdriver-operated TRACE ROT rotary.

1. Press softkey SCREEN CALIBR. This activates the UTIL SCREEN CALIBR CRT menu.

2. Select ‘x-gain’ with the softkeys.

3. Adjust the TRACK (gain) and Δ (offset) rotary so that the two vertical lines displayed coincide exactly with the 3rd and 9th vertical graticule lines.

1. Select ‘x-text’ with the softkeys (menu header should be UTIL SCREEN CALIBR CRT).

2. Adjust the TRACK rotary for maximum stability of the displayed text.

3. Adjust the Δ rotary so that the vertical line displayed is exactly in the middle of the graticule.

1. Select ‘y-gain’ with the softkeys (menu header should be UTIL SCREEN CALIBR CRT).

2. Adjust the TRACK (gain) and Δ (offset) rotary so that the two horizontal lines displayed coincide exactly with the 2nd and 8th horizontal graticule lines.

3. Select ‘y-offs’ with the softkeys.

4. Adjust the TRACK rotary so that the horizontal line displayed is exactly in the middle of the graticule.

1. Push the second softkey again to obtain ‘x-gain’ (menu header changes to UTIL SCREEN CALIBR VECTOR).

2. Adjust the TRACK rotary for minimal over- or undershoot in the horizontal direction of the test pattern.

3. Select ‘x-offs’ with the softkeys.

4. Adjust the TRACK rotary so that the lines of the test pattern coincide exactly with the graticule in the horizontal direction.

1. Select ‘y-gain’ with the softkeys (menu header should be UTIL SCREEN CALIBR VECTOR).

2. Adjust the TRACK rotary for minimal over- or undershoot in the vertical direction of the test pattern.

3. Select ‘y-offs’ with the softkeys.

4. Adjust the TRACK rotary so that the lines of the test pattern coincide exactly with the graticule in the vertical direction.

5. Press softkey ‘accept’ if the screen calibrations are correct.

6. Press softkey RETURN to go to the UTIL MAINTENANCE MENU.

1. Press softkey MANUAL CALIBR.

2. Select ‘astig’ with the TRACK rotary.

3. Position the CH1 trace in the center of the graticule.

4. Adjust the Δ rotary for the best possible sharpness of text across the screen: the small dots composing the text must be clearly visible. Adjustment of the FOCUS rotary may be necessary during this adjustment.

1. Press the CAL key for 2 seconds.

2. The instrument will automatically perform its main calibrations within approximately 4 minutes.

3. Watch the CRT and check that no errors are reported. If errors are mentioned, the oscilloscope requires corrective maintenance. The error number indicates the potential faulty part of the oscilloscope.

1. Press the STATUS and TEXT OFF keys simultaneously for a defined setup.

2. Select the key sequence UTILITY > MAINTENANCE > MANUAL CALIBR.

3. Select ‘lf ch1’ with the TRACK rotary.

4. Select ‘lfx100’ with the softkeys (Δ sign appears).

5. Set CH1 to 1 V/div with DC coupled input.

6. Apply a 100 kHz square-wave signal of 2.75V (pp into 50Ω) from a calibrator (mode ‘edge’) or a 100 kHz / 5 Vpp square-wave from a function generator to CH1.

7. Select 50Ω input impedance (or use a 50Ω termination resistor).

8. Adjust MTB/VAR to 2.00 µs/div.

9. Adjust the Δ rotary for a flat pulse top (do not adjust the initial overshoot).

10. Select ‘lfx10’ with the softkeys (Δ sign appears).

11. Set CH1 to 0.1 V/div.

12. Change the square-wave signal to 10 kHz/500 mV peak-peak.

13. Adjust MTB/VAR to 20.0 µs/div.

14. Adjust the Δ rotary for a flat pulse top (do not adjust the initial overshoot).

15. Remove the input signal.

The goal is to adjust the waveform tops to be as flat as possible, ignoring the initial overshoot, for both the x100 and x10 settings.

1. Select ‘lf ch2’ with the TRACK rotary in the MANUAL CALIBR menu.

2. Select ‘lfx100’ with the softkeys (Δ sign appears).

3. Switch CH2 ON and CH1 OFF.

4. Press the TRIG 2 key.

5. Set CH2 to 1 V/div with DC coupled input.

6. Apply a 100 kHz square-wave signal of 2.75V (pp into 50Ω) from a calibrator (mode ‘edge’) or a 100 kHz / 5 Vpp square-wave from a function generator to CH2.

7. Select 50Ω input impedance (or use a 50Ω termination resistor).

8. Adjust MTB/VAR to 2.00 µs/div.

9. Adjust the Δ rotary for a flat pulse top (do not adjust the initial overshoot).

10. Select ‘lfx10’ with the softkeys (Δ sign appears).

11. Set CH2 to 0.1 V/div.

12. Change the square-wave signal to 10 kHz/500 mV peak-peak.

13. Adjust MTB/VAR to 20.0 µs/div.

14. Adjust the Δ rotary for a flat pulse top (do not adjust the initial overshoot).

15. Remove the input signal.

Note: This section can be skipped for PM3370A, PM3380A and PM3390A. For PM3382A and PM3392A only the ‘lfx10’ step needs adjustment.

1. Select ‘lf ch3’ with the TRACK rotary in the MANUAL CALIBR menu.

2. Select ‘lfx100’ with the softkeys (Δ sign appears).

3. Switch CH3 ON and CH2 OFF.

4. Press the TRIG 3 key.

5. Set CH3 to 1 V/div with DC coupled input.

6. Apply a 100 kHz square-wave signal of 2.75V (pp into 50Ω) from a calibrator (mode ‘edge’) or a 100 kHz / 5 Vpp square-wave from a function generator to CH3.

7. Select 50Ω input impedance (or use a 50Ω termination resistor).

8. Adjust MTB/VAR to 2.00 µs/div.

9. Adjust the Δ rotary for a flat pulse top (do not adjust the initial overshoot).

10. Select ‘lfx10’ with the softkeys (Δ sign appears).

11. Set CH3 to 0.1 V/div.

12. Change the square-wave signal to 10 kHz/500 mV peak-peak.

13. Adjust MTB/VAR to 20.0 µs/div.

14. Adjust the Δ rotary for a flat pulse top (do not adjust the initial overshoot).

15. Remove the input signal.

Note: For PM3370A, PM3380A, PM3382A, PM3390A and PM3392A only the ‘lfx10’ step needs adjustment.

1. Select ‘lf ch4’ with the TRACK rotary in the MANUAL CALIBR menu.

2. Select ‘lfx100’ with the softkeys (Δ sign appears).

3. Switch CH4 ON and CH3 OFF.

4. Press the TRIG 4 key.

5. Set CH4 to 1 V/div with DC coupled input.

6. Apply a 100 kHz square-wave signal of 2.75V (pp into 50Ω) from a calibrator (mode ‘edge’) or a 100 kHz / 5 Vpp square-wave from a function generator to CH4.

7. Select 50Ω input impedance (or use a 50Ω termination resistor).

8. Adjust MTB/VAR to 2.00 µs/div.

9. Adjust the Δ rotary for a flat pulse top (do not adjust the initial overshoot).

10. Select ‘lfx10’ with the softkeys (Δ sign appears).

11. Set CH4 to 0.1 V/div.

12. Change the square-wave signal to 10 kHz/500 mV peak-peak.

13. Adjust MTB/VAR to 20.0 µs/div.

14. Adjust the Δ rotary for a flat pulse top (do not adjust the initial overshoot).

15. Remove the input signal.

1. Apply a 1V/1 MHz square-wave signal with a rise-time faster than 1 ns to CH1 (calibrator ‘edge’ mode or fast-rise generator). Use a 10x attenuator at the cable end. For reduced channels (0.1/0.5 V/div) and EXT TRIG (0.1/1 V/div), use a 2:1 (6dB) attenuator.

2. Press AUTOSET.

3. Set CH1 to 20 mV/div with DC coupled input.

4. Select 50Ω input impedance (or use a 50Ω termination resistor directly at the input).

5. Adjust MTB/VAR to its fastest position (20.0 or 50.0 ns/div). Fine-tune MTB/VAR for a good view of signal details.

6. Select key sequence ‘UTILITY > MAINTENANCE > MANUAL CALIBR’.

7. Select ‘hf y’ with the TRACK rotary.

8. Select in succession ‘pulse t4’, ‘pulse t3’, ‘pulse t2’, ‘pulse t1’, and ‘pulse t0’ with the softkeys.

9. Adjust the Δ rotary for each pulse setting (t4 to t0) to achieve maximum pulse top flatness and the required rise-time. This is a compromise between fast rise-time and minimal pulse distortion (aberrations). Rise-time requirements: ≤ 6ns (60 MHz models), ≤ 3.6 ns (100 MHz models), ≤ 2 ns (200 MHz models), including generator rise-time. Pulse aberrations must not exceed +/- 10%.

10. Remove the input signal.

To check bandwidth:

11. Apply a 120 mV/50 kHz sinewave from a constant amplitude sinewave generator (e.g., Fluke 5500A ‘levsine’ mode) to CH1. For reduced channels and EXT TRIG input, apply 600 mV / 50 kHz.

12. Press AUTOSET.

13. Select 50Ω input impedance (or use a 50Ω termination resistor).

14. Adjust the sinewave amplitude to exactly 6 divisions.

15. Increase the sinewave frequency to the instrument’s bandwidth rating (60, 100, or 200 MHz).

16. Check that the amplitude on the screen does not become smaller than 4.2 divisions.

17. Remove the input signal.

18. Repeat the bandwidth check for CH2, CH3, CH4, and EXT TRIG input. (Note: For PM3392A CH3/CH4 and PM3390A EXT TRIG, use the 10:1 probe).

19. Remove the input signal.

1. Press the ANALOG key to switch to digital mode (message DIGITAL MODE appears briefly).

2. Apply a 1V/1 MHz square-wave signal with a rise-time faster than 1 ns to CH1 (calibrator ‘edge’ mode or fast-rise generator). Use a 10x attenuator. For reduced channels (0.1/0.5 V/div) and EXT TRIG (0.1/1 V/div), use a 2:1 (6dB) attenuator.

3. Press AUTOSET.

4. Set CH1 to 20 mV/div with DC coupled input. Set reduced channels and EXT TRIG to 0.1 V/div.

5. Set MTB/VAR to 5.00 ns/div.

6. Select 50Ω input impedance (or use a 50Ω termination resistor).

7. Use POS CH1 to position the signal in the vertical middle of the screen.

8. Adjust the TRIGGER LEVEL to -100%.

9. Select key sequence UTILITY > MAINTENANCE > MANUAL CALIBR.

10. Select ‘hfdso’ with the TRACK rotary.

11. Select ‘hf CH1’ with the softkeys (Δ sign appears).

12. Adjust the Δ rotary for maximum pulse top flatness and the required rise-time. This is a compromise. Rise-time requirements: ≤ 6 ns (60 MHz), ≤ 3.6 ns (100 MHz), ≤ 2 ns (200 MHz), including generator rise-time. Pulse aberrations must not exceed +/- 12%.

13. Remove the input signal from CH1.

14. Check for equal pulse response (rise-time and aberrations) on all input channels at 20 mV/div (use 0.1 V/div for reduced channels/EXT TRIG). If major differences exist, repeat the adjustment aiming for the most equal response possible.

15. Remove the input signal.

To check bandwidth:

16. Apply a 120 mV/50 kHz sinewave from a constant amplitude generator (‘levsine’ mode) to CH1. For reduced channels and EXT TRIG, apply 600 mV/50 kHz.

17. Press AUTOSET.

18. Select 50Ω input impedance (or use a 50Ω termination resistor).

19. Adjust the sinewave amplitude to exactly 6 divisions.

20. Increase frequency to the instrument’s bandwidth rating (60, 100, or 200 MHz).

21. Check that the amplitude does not become smaller than 4.2 divisions.

22. Remove the input signal.

23. Repeat the bandwidth check for CH2, CH3, CH4, and EXT TRIG. (Note: For PM3392A CH3/CH4 and PM3390A EXT TRIG, use the 10:1 probe).

24. Remove the input signal.

Note: ‘logic’ and ‘state’ adjustments can be skipped for PM3390A, PM3380A, and PM3370A.

Edge Trigger Adjustment:

1. Apply a 1V/1 MHz square-wave signal with rise-time < 1 ns to CH1 (calibrator 'edge' mode or fast-rise generator).

2. Press AUTOSET.

3. Set CH1 to 0.2 V/div with DC coupled input.

4. Select 50Ω input impedance (or use a 50Ω termination resistor).

5. Position the signal exactly in the vertical middle of the screen.

6. Set MTB/VAR TIME/DIV to 2.00 ns/div (200 MHz models) or 5.00 ns/div.

7. Press menu key TRIGGER, select ‘edge’, set level-pp ‘off’, and ‘dc’ trigger coupling.

8. Turn TRIGGER LEVEL rotary to adjust the level indicator (-T) 0.2 div below the vertical middle.

9. Adjust TRIGGER POSITION rotary for a Delay readout of -5 div.

10. Select key sequence UTIL > MAINTENANCE > MANUAL, then select ‘tr com’ with TRACK rotary.

11. Select ‘edge’ with the softkey (Δ sign appears).

12. Adjust the Δ rotary so the leading edge crosses the center of the screen.

Logic/State Trigger Adjustment (Skip for PM3370A/80A/90A):

13. Press menu key TRIGGER, select ‘logic’ and ‘state’.

14. Use front panel keys TRIG1…TRIG4 to set trigger pattern ‘1xxx’ in the TRIGGER MAIN TB menu.

15. Turn TRIGGER LEVEL rotary to adjust level indicator (-T) 0.2 div below the vertical middle.

16. Select key sequence UTIL > MAINTENANCE > MANUAL, then select ‘tr com’ with TRACK rotary.

17. Select ‘logic’ with the softkey (Δ sign appears).

18. Adjust the Δ rotary so the leading edge crosses the center of the screen.

Event Delay Adjustment:

19. Select key sequence TB MODE > EVENT DELAY > ‘on’ and ‘CHANNEL 1’.

20. Turn TRIGGER LEVEL rotary to adjust level indicator (-T) 0.2 div below the vertical middle.

21. Turn the Δ rotary to adjust the event level indicator (-E) 0.2 div below the vertical middle.

22. Select key sequence UTIL > MAINTENANCE > MANUAL, then select ‘tr com’ with TRACK rotary.

23. Select ‘events’ with the softkey (Δ sign appears).

24. Adjust the Δ rotary so the leading edge crosses the center of the screen.

Delayed Time Base (DTB) Adjustment:

25. Select key sequence TB MODE > EVENT DELAY > off.

26. Press menu key TRIGGER and select ‘edge’.

27. Press menu key DTB, select DEL’D TB on, trig’d, dc, and MAIN TB off.

28. Set MAIN TB TIME/DIV to 100 ns/div and DEL’D TB TIME/DIV to 20.0 ns/div.

29. Adjust MAGNIFY to 4x.

30. Turn the Δ rotary (DTB TRIGGER LEVEL) to adjust level indicator (-D) 0.2 div below the vertical middle.

31. Select key sequence UTIL > MAINTENANCE > MANUAL, then select ‘tr com’ with TRACK rotary.

32. Select ‘dtb’ with the softkey (Δ sign appears).

33. Adjust the Δ rotary so the leading edge crosses the center of the screen.

If you are sure the instrument is well calibrated, follow these steps to save the data:

1. Press softkey RETURN (if necessary, to exit a specific calibration menu).

2. If present, remove the calibration sticker from the pin hole.

3. Press softkey ‘save calibr data’.

4. Press the pin hole key (e.g., with a paperclip). The viewing area will indicate how many ‘calibration fields’ are free.

Note: This ‘save’ action can only be done a limited number of times (typically 10). If the memory is full, refer to chapter 8.9.2 for instructions.

5. Close the pin hole key with a new calibration sticker (part number 5322 455 81144).

You can perform a quick check using specific tests from chapter 6 ‘PERFORMANCE TEST’:

1. Vertical deflection; deflection coefficients (section 6.3.6).

2. Horizontal deflection; MAIN TB deflection coefficients (section 6.3.24).

3. Horizontal deflection; delayed time-base deflection coefficients (section 6.3.27).

A full performance test as described in chapter 6 can also be performed if desired.

General precautions:

* Protect removed circuit boards from damage.

* Use tools properly.

* Carefully note the connections of all disconnected leads for correct reassembly.

CAUTION: Damage may result if:

* The instrument is switched on when a circuit board has been removed.

* A circuit board is removed within one minute after switching off the instrument.

WARNING: Discharge the Extremely High Tension (EHT) cable (connected to the EHT-multiplier unit) by shorting its terminal to the instrument’s earth before disconnecting it from the post-acceleration anode.

Note: The cabinet does not need to be removed for the calibration adjustment procedure.

To remove the cabinet:

1. Fit the front cover onto the instrument.

2. Hinge the carrying handle clear of the front cover.

3. Place the instrument with the front cover on a flat surface.

4. Pull off both plastic parts surrounding the instrument’s rear feet.

5. Remove the six (6) screws securing the cabinet to the instrument’s rear panel.

6. Gently slide the cabinet (including the carrying handle) off the instrument.

ATTENTION: When reinstalling the cabinet:

* Ensure cables are not damaged between the cabinet and chassis, especially the flat cable above the CRT connecting Front unit A4 and CRT controls unit A5.

* Ensure the cabinet fits well into the plastic front frame.

* Ensure grounding fingers are not damaged.

To remove the carrying handle only:

1. Locate the metal ‘omega’ clips securing the handle’s rotation points.

2. Remove these clips.

3. Pull both handle ends outwards away from the instrument.

Standard Parts: Many standard electronic components can be obtained locally. Check the parts list for value, tolerance, rating, and description before ordering. NOTE: Physical size and shape can affect performance, especially at high frequencies. Always use direct-replacement components unless a substitute is known not to degrade performance.

Special Parts: These include components manufactured or selected by FLUKE for specific performance or safety requirements. ATTENTION: Special parts must only be replaced by components obtained through your local FLUKE organization or representative.

Transistors and Integrated Circuits: Return devices to their original positions if removed. Avoid unnecessary replacement as it may affect calibration. Use original type or direct replacement parts. Bend leads to fit and cut to the original length. Check operation after replacement.

The oscilloscope contains static sensitive components indicated by a black/yellow symbol. These can be damaged by electrostatic discharge (ESD), potentially causing immediate or delayed failure (‘wounding’).

Precautions:

* Handle and service static sensitive components and assemblies only at a static-free workstation.

* Work should be performed by qualified personnel.

* CAUTION: Personnel handling these devices should normally be connected to ground via a high-ohmic resistor.

Refer to Support Bulletin OSC296 (ordering number 4822 872 08407) for extensive information.

Working method:

1. Carefully unsolder the tags of the component one by one.

2. Remove all excess solder using desolder braided wire (ordering code: 4822 321 40042).

3. Ensure leads of the replacement part are clean and pre-tinned.

4. Place the replacement part in the exact same position and solder each lead to the corresponding conductor.

NOTE: Maximum permissible soldering time is 10 seconds. Lead temperature must not exceed 250°C. Use solder with a low melting point. Avoid damaging plastic encapsulation (softens at 150°C).

ATTENTION: Use a low voltage soldering iron with its tip grounded to the oscilloscope chassis when soldering inside the instrument.

Suitable iron: Mini soldering station WECP-COD3 (regulated transformer) and Weller LR-20 (soldering iron). An ordinary 35-40W pencil-type iron with 60/40 core solder can be used for most tasks, but avoid excessive heat on the PCB.

Due to the small size and spacing, special tools are needed:

Suitable Soldering Tools:

* Mini soldering iron station, WECP-COD3 (regulated transformer) and Weller MLR-20 (mini soldering iron) with a pin-point tip (max diameter 1mm).

* Hot-air solder tool: Leister Hot-Jet.

Recommended Materials:

* Soldering tin: 0.8 mm diameter, SnPb 60/40 with Resin Mildly Activated (RMA) flux (Ordering code: 4822 390 80133).

* Desolder braided wire (Ordering code: 4822 321 40042).

* Solder paste 26.

* Non-corrosive RMA flux-Colophony (Ordering code: 4822 390 50025).

Refer to Support Bulletin OSC296 (ordering code 4822 872 08407) for a complete discussion of SMD soldering techniques.

Rotary knobs can be removed by simply pulling them off. They have an integrated shaft and fixing device. Most are light grey, cursor positioning knobs are dark grey, and DELAY/LEVEL DTB knobs are almost white (‘dark mushroom’). For installation, push the knob into its hole and rotate gently until it clicks into place.

These cables use connectors with an integrated locking device.

To detach:

1. Lift the outside part (the locking bar/lever) of the connector simultaneously on both sides. This unlocks the cable.

2. Pull the ribbon cable out of the connector.

To reattach:

1. Push the ribbon cable fully into the connector. Ensure the blue line on the cable is on the side of the connector where the contacts are visible (when the connector is in the unlocked position).

2. Push down the outside part (locking bar/lever) of the connector to lock the cable.

1. Remove 3 screws with washers fixing the PCB to the chassis plate.

2. Remove 1 long screw that fixes (and grounds) the input attenuator screen to the chassis plate.

3. Unplug the blue ribbon cable.

4. Lift the rear side of the unit over the plastic stud and slide the unit backwards to loosen it from the chassis.

NOTE: The unit can now be toppled over. Reinstall the blue ribbon cable to measure the SMD component side in working condition.

5. Unplug the white ribbon cable and the coaxial delay line connector.

6. Unplug connectors for output options (MTB gate, DTB gate, MTB sweep) if present.

7. Remove the unit from the instrument.

To remove the attenuator screen:

1. Pull off the plastic bracket between the BNC inputs.

2. Remove the two screws between the BNCs.

3. Remove the two screws in the sides of the screening plate.

ATTENTION: This unit contains high voltages. Work on it under live conditions only if unavoidable, by a qualified technician aware of the dangers.

1. Remove the screw that secures (and grounds) the unit to the bottom chassis plate.

2. Carefully disconnect the 4 wires leading to the CRT (X- and Y-deflection plates). Avoid damaging the CRT side connections. Refer to the wiring diagram (chapter 4.2) for correct reinstallation.

3. Bend out the two clamping lips securing the unit at the top side. The unit is now loose.

NOTE: The unit can be placed in an inclined position for measuring the SMD-component side in working condition. Use a 10 kΩ damping resistor between the measuring point and probe tip when measuring X/Y deflection plate outputs to avoid oscillations.

4. Unplug the two ribbon cables.

5. Unplug the delay line connector.

6. Take the unit out of the chassis.

WARNING: This unit carries dangerous high voltages (-2.2 kV) which can remain for some time after disconnecting power. Wait at least five minutes after disconnecting from mains before removing the board. Live work must be done by a qualified technician aware of the dangers.

1. Unplug the ribbon cable at the Final XYZ amplifier or at the CRT socket unit.

2. Gently pull the unit off the CRT socket.

3. Unplug the -2.2 kV cathode/filament (3 wires).

IMPORTANT: Handle the CRT and its side connections carefully. Rough handling or scratching can cause implosion. When installing, remove the protective cover first and ensure the screen is pressed tightly against the front of the chassis.

WARNING: The E.H.T. cable is connected to the E.H.T. multiplier on the power supply. When disconnected from the CRT, the cable MUST be discharged by shorting it to the instrument’s ground (e.g., the CRT screen).

1. Remove the unit from the socket of the CRT (refer to section 8.5.5).

2. Carefully disconnect the 4 wires leading to the CRT (X- and Y-deflection plates), avoiding damage to the side connections. Refer to the wiring diagram (chapter 4.2) for reinstallation.

3. Pull the graticule lamp holder out of the front rubber.

4. Remove the bezel and contrast filter.

5. Unplug the trace rotation cable (3 wires) at the connector board.

6. Unlock the EHT cable connector from the CRT.

7. Discharge the EHT cable to ground potential (e.g., CRT screen).

8. Push the two plastic clamping lips that secure the CRT support to the chassis.

9. Gently lift the CRT (including its shield) out of the oscilloscope.

NOTE: To preserve memory contents while the unit is removed, turn the instrument ON and move the battery back-up plug X1006 (on unit A6) to connector X1901 on unit A3 before proceeding.

1. Remove the screw securing the unit to the rear panel.

2. Remove the screw securing (and grounding) the unit to the bottom chassis plate.

3. Unplug the ribbon cable leading to signal unit A1.

4. If the IEEE option is installed, unplug the ribbon cable leading to the IEEE-connector.

5. Slide the unit upwards out of the instrument.

NOTE: Unit A3 can be measured under working conditions using extension board 5322 218 61479. This board has a jumper to switch off the EHT converter, though this feature is not typically used when testing the microprocessor.

First, remove the front frame from the chassis:

1. Unlock the ribbon cable connecting to the units at the connector board.

2. Bend out the four clamping lips holding the frame to the chassis.

3. Remove the frame.

To remove Front unit A4 from the frame:

1. Pull the self-locking white plastic clamps securing the board.

2. Remove the rotary knobs from unit A4.

3. Bend out the four clamping lips securing unit A4 to the frame.

4. Take the unit out.

5. If required, separate the rubber key mat from the PCB. NOTE: Keep contact areas clean (use cleansing alcohol if dirty). Small studs position the mat; press gently into matching holes during reinstallation. The spare key mat is universal; cut off unnecessary keys with a sharp knife if needed.

To remove CRT controls unit A5 from the frame:

1. Remove the rotary knobs from unit A5.

2. Pull the two self-locking white plastic clamps securing the board.

3. Take the unit out of the front frame.

WARNING: The power supply contains dangerous high voltages that can persist after disconnecting mains. Wait at least five minutes after unplugging before removing the unit. Live work must be done by a qualified technician aware of dangers.

WARNING: The E.H.T. cable connected to this unit MUST be discharged by shorting it to ground (e.g., CRT shielding) before handling if it was disconnected from the CRT.

1. If preserving memory contents is necessary: Turn ON the instrument, move back-up voltage plug X1006 to microprocessor unit A3 (X1901), then Turn OFF the instrument.

2. Disconnect the oscilloscope from the mains power.

3. Remove the screw securing unit A6 to the chassis.

4. Unplug the cables from the -2.2 kV cathode/filament (3 wires) and the fan (2 wires).

5. Unplug the +14.3 kV connector from the CRT (ensure EHT is discharged if applicable).

6. Unlock the plastic clamps (part of the chassis) securing the lower edges of the unit.

7. Slide the unit upwards out of the instrument.

8. Unplug the mains input connector (3 thick wires).

NOTE: Power supply unit A6 can be measured under working conditions using extension board 5322 218 61479. For safety, it’s strongly recommended to use the jumper on this board to switch off the EHT converter.

NOTE: After reinstallation, return the Battery Back-Up voltage plug (X1006) to its original position on unit A6 when the instrument is turned ON.

1. Remove the screw that secures (and grounds) the unit to the bottom chassis plate.

2. Slide the unit upwards out of the instrument.

3. Unplug the coaxial cables from the unit. Note the color-coded rings on cables and connectors to ensure correct reinstallation.

NOTE: ICs DARLIC (D8027) and DSP (D8069) are socketed. Special tools are recommended for removal due to numerous pins (e.g., AMP 821566-1 for PLCC68 DSP; Terminal TW2068 for pin grid array DARLIC). Reinstalling DARLIC requires considerable pressure; be careful not to bend pins or damage components on the other side of the board.

The unit can be measured under working conditions using extension board 5322 218 61479. This board has a jumper to switch off the EHT converter on the power supply (connected via A8), though this feature is not typically needed when testing the digitizer itself.

If shipping to a Service Centre:

1. Attach a tag with the full address and name of a contact person at the user’s firm.

2. Include the complete instrument, its serial number, and a description of the fault.

3. If the original packing is not available, repack the instrument securely to prevent damage during transport.

If a fault appears, follow this sequence:

1. Verify Control Settings: Check if the instrument controls are set correctly. Consult the Operating guide.

2. Check External Equipment: Check the equipment connected to the oscilloscope and the interconnection cables.

3. Verify Calibration: Check if the instrument is properly calibrated. If not, try the autocalibration (press CAL key for 2 seconds). If this fails, refer to Chapter 7 ‘Calibration Adjustment Procedure’.

4. Locate Faulty Circuit: Identify the circuit(s) where the fault is suspected based on the symptom. Power supply issues may cause symptoms in multiple circuits.

5. Visual Inspection: Visually inspect the suspected circuit(s) for issues like ‘cold’ or defective solder joints, intermittent or open connections (plugs, wires), or damaged components.

WARNING: The power supply has dangerous high voltages that persist after unplugging. Wait at least five minutes after disconnecting mains before removing the unit. Live work requires a qualified technician aware of dangers, and using a mains isolation transformer is strongly recommended.

Methods:

1. Dummy Loads: Disconnect the oscilloscope circuits and connect dummy loads to the power supply outputs (connector X1002) to determine if the fault is in the supply or the connected circuits. Resistors and a suitable connector (ordering number 5322 267 70308) can be ordered. Use the table below for load values.

2. Extension Board: Use the extension board (ordering code 5322 218 61479). It allows measuring the power supply while operating. For safety, it’s strongly recommended to remove the jumper on the board to disable the EHT-converter.

3. Current Measurement: Measure the current drawn from a specific supply voltage by removing its series choke (L1273, L1201, L1202, L1203, L1204, L1206, L1208, L1209) and connecting a current meter in its place.

Power Supply Output Specifications and Dummy Loads:

Supply voltage	Current drain	Substitution resistance	Dissipated power	Dummy load resistors (Example)
+5 V	3000 mA	1.7Ω	15 W	5x 10Ω/4W (4822 112 21054) in parallel
-5.2V	1750 mA	2.9Ω	8.7W	3x 10Ω/4W (4822 112 21054) in parallel
+12 V	1750 mA	6.8Ω	21 W	3x 22Ω/7W (4822 112 41063) in parallel
-12 V	1450 mA	8.3Ω	17.4W	3x 27Ω/7W (4822 112 41065) in parallel
+18 V	550 mA	32.8Ω	10 W	3x 10Ω/4W (4822 112 21054) in series
-18 V	195 mA	92.5Ω	3.5W	2x 47Ω/4W (4822 112 21072) in series
+58 V	60 mA	966 Ω	12.1W	2x 470Ω/7W (4822 112 41098) in series
-58 V	80 mA	725 Ω	4.7W	330Ω/4W (4822 112 21094) and 390Ω/4W (4822 112 21096) in series.
+10 Vref	9 mA	1100 Ω	0.1W	—
6.3Vac	240 mA	26.3Ω	1.5W	—
-2.2kV	700 µA	3.1MΩ	1.55W	—
+14.5kV	50 µA	290 MΩ	0.7W	—

1. Extension Board (Ordering number 5322 218 61479): Allows units A3 (microprocessor) and A6 (power supply) to be plugged in outside the chassis for test and repair. It includes a jumper to disable the EHT-converter for safety, which is strongly recommended when working on the power supply.

2. Flash-ROM Loader Program: Used by Service Centers to manage the Flash-ROM data. After saving calibration data 10 times, the Flash-ROM becomes full (‘NO CALIBRATION FIELDS FREE’). The oscilloscope must then be sent to a Service Center to have redundant calibration blocks removed using this program via the RS232 interface. Empty replacement Flash-ROMs (D1013, D1015) also need to be filled with operating software and calibration data by a Service Center using this program.

Yes. After any electrical component has been replaced, the calibration of its associated circuit and any closely-related circuits should be checked. If work was done on the power supply or the transformer was replaced, the calibration of the entire instrument should be checked, as the power supply affects all circuits.

The power-up tests run automatically and take less than a second. If no error message appears, the oscilloscope is ready. The tests include:

* Internal Control Bus (I2C): Checks communication with devices N9001-N9003, N8005, N6014, D9009 (A1), N1001, N2002 (A2), N1141 (A6), N8009, N8070 (A8). Error: ‘NO ACKNOWLEDGE ON I2C BUS’.

* Hardware Configuration: Tests A1 (bandwidth, channels), A3 (IEEE interface), A8 (memory amount). Checks software/hardware compatibility. Errors: ‘WRONG A1 HARDWARE VERSION’, ‘WRONG A3 HARDWARE VERSION’, ‘WRONG A8 HARDWARE VERSION’.

* Front Panel Communication: Checks communication between front unit A4 (‘ufo’) and microprocessor A3. Error: ‘CANNOT COMMUNICATE WITH UFO’.

* Settings Memory: Checks if back-up batteries are installed and retaining settings. Error: ‘NO BATTERY BACKUP’.

* Digitizer Unit A8 ICs/Buses: Tests BATGE, DARLIC, CURCON, MAM, PRAM. Errors like ‘DARLIC ERROR’, ‘CURCON ERROR’, etc., may be displayed.

A good knowledge of the oscilloscope circuitry (Chapter 5 ‘Unit descriptions’) is needed to effectively use these tests.

1. Press the menu key ‘UTIL’.

2. Press the softkey ‘MAINTENANCE’.

3. Select between ‘SELFTEST’ and ‘REPAIR TOOLS’ using the softkeys.

NOTE: Solder joints are added in the PCB tracks for servicing, allowing suspected ICs to be isolated from the SCL or SDA bus lines for fault localization.

Selftests primarily check bus structures on digitizer unit A8 and microprocessor unit A3 using bit patterns (FF, 00, AA, 55 hex) to detect stuck bits, shorts, or opens. Use ‘test-all’ for a sequence or ‘specific’ (with TRACK rotary) to select individual tests. ‘TEST PASSED’ indicates success; ‘TEST FAILED’ or an error code indicates a problem. Note that some tests (like RAM tests) are more comprehensive than others (like device function tests). Tests are initiated by the microprocessor (A3) and routed to the digitizer (A8) via bus lines and connector A10.

Specific tests include:

* CPURAM: Checks RAM (D1012) on unit A3.

* BATGE (D8048): Tests communication with Bus Arbiter/Trace Generator. Checks connection to MAM (D8054, D8056). Error codes (5 positions) are for factory use.

* DSP (D8069): Checks communication between DSP and microprocessor (A3). Tests acknowledge response. DSP functions include Average, Envelope, Math, Interpolation, Filters, Display refresh, X position, Delta T.

* DARLIC (D8027): Tests register access within Data Acquisition/Trigger Logic IC. Functions include data path (FAM to MAM), trigger engine.

* CURCON (D8047): Checks databus to Cursor/Text Control IC and its RAM (D8051). Error codes (5 positions) are for factory use.

* MAM (D8054, D8056): Checks global databus from BATGE to Main Acquisition Memory. Error codes (5 positions) are for factory use.

* FAM (D8037-D8046): Databus test for Fast Acquisition Memory (stores ADC samples). Error codes (5 positions) are for factory use.

* PRAM (D8049, D8052): Checks Program Memory for the DSP. Error codes (5 positions) are for factory use.

* ROM0, ROM1: Checks Flash-ROMs (D1013, D1015) on unit A3 via checksum. Displays checksum if passed. Errors prevent normal function.

This test checks the front panel keys and rotaries (ufo). Activate using the ‘on off’ toggle softkey under ‘REPAIR TOOLS’. Operate a key or rotary; its corresponding code and position/direction information will appear on the two lines of the display.

Rotary Codes (L=left, R=right, X=speed):

ILLUM	L/R0X	INTENS TEXT	L/R1X	INTENS TRACE	L/R2X
POS CH2	L/R3X	DELAY	L/R4X	HOLD OFF	L/R5X
POS CH4	L/R6X	TRIGGER LEVEL	L/R7X	FOCUS	L/R8X
FOCUS	L/R8X	TRACE ROT	L/R9X	TRACK	L/RAX
POS CH1	L/RBX	Δ	L/RCX	TRIGGER POS	L/RDX
POS CH3	L/REX	X POS	L/RFX

Key Codes (Example for PM3394A, A=autorepeat, M=multi-key, P=function off, U=function on):

CAL	X00	AUTOSET	X01	ANALOG	X20
STATUS/LOCAL	X02	Softkey 5	X03	Softkey 6	X04
TEXT OFF	X05	CH1 + CH2	X06	AC DC GND CH1	X07
UTIL	X10	SETUPS	X11	Softkey 1	X12
Softkey 4	X13	AMPL mV CH1	X14	AMPL V CH1	X15
AMPL mV CH2	X16	AMPL V CH2	X17	pin hole	X21
Softkey 2	X22	Softkey 3	X23	AUTO RANGE CH1	X24
ON CH1	X25	AUTO RANGE CH2	X26	ON CH2	X27
DTB s	X32	DTB	X33	VERT MENU	X34
TRIG1	X35	INV CH2	X36	AC DC GND CH2	X37
TRIGGER	X41	CURSORS	X42	DTB ns	X43
AVERAGE	X44	TRIG2	X45	AMPL mV CH3	X46
AMPL V CH3	X47	MAGNIFY down	X51	RUN/STOP	X52
TB MODE	X53	TRIG4	X54	TRIG3	X55
AUTO RANGE CH3	X56	ON CH3	X57	MAGNIFY up	X61
MTB s	X63	INV CH4	X64	AUTO RANGE CH4	X65
CH3 + CH4	X66	AC DC GND CH3	X67	SINGLE	X72
MTB ns	X73	AC DC GND CH4	X74	ON CH4	X75
AMPL mV CH4	X76	AMPL V CH4	X77	ACQUIRE	X31
AUTO RANGE TB	X62
SAVE	X30	RECALL	X40	MEASURE	X50
MATH	X60	DISPLAY	X70	PLOT	X71

Note: Key availability/function varies by model.

This test displays the data (SDA) sent by the microprocessor to various I2C devices, synchronized by SCL. Activate the test using the ‘on off’ softkey. The display shows the device address followed by the hexadecimal data bytes (A-F represent hex digits).

I2C Devices and Addresses:

Device	Unit	Name of circuit diagram	Address	Data format
D9009	A1	Display and trigger control	36	AB CD EF
N9001	A1	Control circuits	40	AB CD
N9002	A1	Control circuits	4C	AB CD
N9003	A1	Control circuits	44	AB CD
N8005	A1	Time base logic	48	AB CD
N1001	A2	Final Y preampl. + control	46	AB CD
N2002	A2	Final X amplifier + control	4E	AB CD
N1141	A6	EHT converter + auxiliary	88	AB CD
N8070	A8	Curcon, DAC’s, Z-control	42 *	AB CD
N8009	A8	Display interface	44 *	AB CD

* The DACs on digitizer unit A8 (N8070, N8009) are directly controlled by DARLIC (D8027), not standard I2C from the main microprocessor.

This test displays the decimal value (representing voltage) read by the microprocessor (D1001) from its analog inputs ACH0 through ACH7. Activate the test using the ‘on off’ softkey. The readout consists of two lines:

First Line (Inputs):

* ACH7: Reads NTC resistor R1009 (on A3) for internal temperature.

* ACH6 (PROBE 4): Represents the type of probe connected to CH4.

* ACH5 (TBSMART): Represents the state of time base circuits (originates from A1, applied to A3).

* ACH4 (PROBE 3): Represents the type of probe connected to CH3.

Second Line (Inputs):

* ACH3 (PROBE 2): Represents the type of probe connected to CH2.

* ACH2 (XCAL): Reads the horizontal output measurement circuit (on A2) for horizontal calibration.

* ACH1 (YCAL): Reads the vertical output measurement circuit (on A2) for vertical calibration.

* ACH0 (PROBE 1): Represents the type of probe connected to CH1.

This test monitors the HEF-bus, used for simple on/off control via shift registers (HEF4094 type) on unit A1. Activate the test using the ‘on off’ softkey. Data (SDA) shifted into the registers is displayed, synchronized by SCL. There are two groups, each with a common enable signal.

HEF-Bus Configuration (Unit A1):

Group	Enable signal	Buffers	Name of circuit diagram
0	STROBEO-HT	D9003, D9004	Control circuits
1	STROBE1-HT	D9011, D9008, D9007, D9012, D9013	MTB trigger, Time base logic, Delayed time base, DTB trigger, DTB trigger

Data Display Format:

* Group 0: ‘0:ABCD’ (16 outputs total). A=D9004(14,13,12,11), B=D9004(4,5,6,7), C=D9003(14,13,12,11), D=D9003(4,5,6,7).

* Group 1: ‘1:ABCD 1:EFGH’ (32 outputs total). A=D9012(14,13,12,11), B=D9012(4,5,6,7), C=D9007(14,13,12,11), D=D9007(4,5,6,7), E=D9008(14,13,12,11), F=D9008(4,5,6,7), G=D9011(14,13,12,11), H=D9011(4,5,6,7).

Each character (A-H) is a hexadecimal representation of 4 output bits.

Note: Data for D9013 is not displayed; it’s used during power-on hardware/software checks. There’s also a HEF-bus on unit A8 (D8034, D8036, D8033, D8032) controlled by DARLIC, which cannot be displayed by this test.

This test monitors the C-bus, used for controlling attenuators (CH1-CH4) and time bases via buffers on unit A1. Activate the test using the ‘on off’ softkey. Data (SDA) shifted into the buffers (each 13 bits) is displayed, synchronized by SCL. Each buffer has its own enable signal.

C-Bus Configuration (Unit A1):

Enable signal	Buffer	Name of circuit diagram
DLENO-HT	D9001	Control circuits (CH1/CH2 attenuator relays)
DLEN1-HT	D9002	Control circuits (CH3/CH4 attenuator relays)
DLEN2-HT	D9006	Main time base

Data Display Format:

* D9006: ‘0:ABCD’ (Hex characters for 4 outputs each)

* D9001 (CH1/CH2): ‘0:ABCD’ (Format complex due to relay driving; changes with attenuator settings)

* D9002 (CH3/CH4): ‘1:ABCD’ (Format complex due to relay driving; changes with attenuator settings)

Refer to chapter 5.1.1 for details on pulse relay control.

This test allows you to select a specific Digital-to-Analog Converter (DAC) output using the TRACK rotary and then manually set its output voltage using the Δ rotary. Activate the test from the ‘REPAIR TOOLS’ menu. The output voltage (typically 0-10V, or 1-4V for D1112/D8006) can then be measured with a voltmeter or oscilloscope at the corresponding DAC pin (after opening the instrument). The DAC value returns to its original setting when you exit the menu. The selection format is X.Y, where X selects the DAC IC and Y selects the specific output pin.

DAC IC Selection (X-value):

X-value	IC reference	Unit	Name of circuit diagram
0.Y	N9001	A1	Control circuits
2.Y	N9003	A1	Control circuits
3.Y	N1001	A2	Final Y preampl. + control
4.Y	N8005	A1	Time base logic
6.Y	N9002	A1	Control circuits
7.Y	N2002	A2	Final X amplifier + control
8.Y	D1112	A3	Potentiometer DAC + IEEE
d1.Y	N8070	A8	Curcon, DAC’s, Z-control
d2.Y	N8009	A8	Display interface
d8.Y	D8006	A8	Reference + adjustment

Output Pin Selection (Y-value for N9001, N9002, N9003, N8005 on A1):

Y-value	Pin	N9001 Signal	N9002 Signal	N9003 Signal	N8005 Signal
X.0	11	PA1OFFSTRG	AT3LFCAL	DLDOFFSET	TBINTTRAT-XA
X.1	13	PA1OFFSET	AT3OFFSET	PA4OFFSTRG	DTBVAR
X.2	14	AT1LFCAL	AT3LOOPCAL	PA4OFFSET	DSOCALD
X.3	15	AT1OFFSET	PA2OFFSTRG	AT4LFCAL	DSOCALM
X.4	16	AT1LOOPCAL	PA2OFFSET	AT4OFFSET	DTRSEN
X.5	17	ATCAL0	AT2LFCAL	AT4LOOPCAL	MTRTVMODE
X.6	18	ATCAL1	AT2OFFSET	PA3OFFSTRG	MTRBAL
X.7	20	ATCAL2	AT2LOOPCAL	PA3OFFSET	MTRSEN

Output Pin Selection (Y-value for N1001, N2002 on A2):

Y-value	Pin	N1001 Function	N2002 Function
X.0	11	LF sq. wave	ASTDR
X.1	13	LF sq. wave	DARK
X.2	14	Gain	XHFADJ
X.3	15	HF sq. wave	XTRAGC
X.4	16	Offset	XCRTGCL
X.5	17	Offset	XCRTGCH
X.6	18	MF sq. wave	XCRTOFL
X.7	20	MF sq. wave	XCRTOFH

Output Pin Selection (Y-value for D1112 on A3, D8006 on A8):

Y-value	Pin	D1112 Function	D8006 Function
X.7	16	POS CH1	OFFSET ADC A
X.4	19	POS CH2	HF SQ WAVE ADJ CH2
X.2	21	POS CH3	HF SQ WAVE ADJ CH4
X.8	13	POS CH4	OFFSET COMPASS CH1
X.1	22	VAR CH1	NOT USED
X.3	20	VAR CH2	HF SQ WAVE ADJ CH3
X.5	18	VAR CH3	HF SQ WAVE ADJ CH1
X.6	17	VAR CH4	OFFSET COMPASS CH3
X.12	9	VAR MTB	GAIN MASPU A
X.11	10	LEVEL MTB	OFFSET CH 1 AND 3
X.10	11	LEVEL DTB	OFFSET COMPASS CH2
X.15	6	INTENS TEXT	OFFSET ADC B
X.9	12	TRACE SEP	OFFSET COMPASS CH4
X.0	23	FOCUS-DA	NOT USED
X.14	7	HOLD OFF	GAIN MASPU B
X.13	8	INTENS TRACE	OFFSET CH 2 AND 4

Note: Refer to chapters 5.1.2 and 5.2.2 for signal name explanations. For N8070/N8009 (A8), the pin/Y-value relation is identical to A1/A2 tables; N8070 controls digitizer intensity, N8009 controls digitizer output stage gain/offset.

IMPORTANT: After completing these tests, reset the oscilloscope by pressing ‘STATUS’ and ‘TEXT OFF’ simultaneously.

After working on the primary (mains) circuit:

1. General Directions:

* Ensure creepage distances and clearances haven’t been reduced.

* Secure wires properly before soldering (bend through holes, wrap in U-shape, use cable clamps/lacing).

* Replace all insulating guards and plates.

2. Safety Components:

* Only replace primary circuit components with those specified in the parts list.

3. Checking Protective Ground:

* Visually inspect the ground connection.

* Measure resistance between the protective ground pin on the mains plug and the cabinet/frame. It must be ≤ 0.5 Ω (test current 25A). Disconnect line power during this test.

4. Checking Insulation Resistance:

* Measure resistance between line connections (both together) and the protective ground connection using 500 V DC. Set the instrument’s mains switch to ON.

* Resistance must be ≥ 2 MΩ (minimum requirement at 40°C, 95% RH; typically 10-20 MΩ under normal conditions).

5. Checking Leakage Current:

* Measure current between each pole of the line supply (in turn) and all accessible conductive parts connected together (including measuring ground terminal).

* Current must be ≤ 0.5 mA rms (without filter capacitor) or ≤ 3.5 mA rms (with filter capacitor).

6. Voltage Test (Hi-Pot):

* Apply 1500 V rms (or DC equivalent) at supply frequency for one second between the supply circuit (both sides connected together) and accessible conductive parts likely to become energized.

* Perform with the instrument fully assembled and the primary switch ON.

* There should be no electrical breakdown.