PHILIPS PM3350A (01) PDF Document

Upon receiving your PHILIPS PM3350A, you should perform an initial inspection. Check the contents of the shipment for completeness and look for any damage that may have occurred during transport. The following parts should be included:

– 1 Oscilloscope

– 2 Batteries

– 1 Front Cover (PM3365A/PM3375 only)

– 1 Operation Guide or Bedienungsanleitung or Notice d’Utilisation

– 1 Mains Voltage Cord

– 2 Probes

– 1 Spare Fuse, 1.6 AT (located inside fuse holder)

– 1 Reference Manual

If the contents are incomplete or if there is damage, a claim should be filed with the carrier immediately. The Philips/Fluke Sales or Service organization should be notified to facilitate the repair or replacement of the instrument.

For correct and safe use of the PHILIPS PM3350A, it is essential that both operating and servicing personnel follow generally-accepted safety procedures in addition to the safety precautions specified in the manual.

CAUTION: Is used to indicate correct operating or maintenance procedures in order to prevent damage to or destruction of the equipment or other property.

WARNING: Calls attention to a potential danger that requires correct procedures or practices in order to prevent personal injury.

Key safety instructions include:

– Before any connection to the inputs is made, the instrument must be connected to protective earth (ground) via the three-core mains (line) cable. The mains plug must be inserted only into a socket outlet provided with a protective earth (ground) contact.

– Any interruption of the protective conductor inside or outside the instrument is likely to make the instrument dangerous. Intentional interruption is prohibited.

– The instrument must be disconnected from all voltage sources when renewing a fuse.

– Whenever it is likely that safety-protection has been impaired, the instrument must be made inoperative and secured against any unintended operation. Safety protection is likely to be impaired if, for example, the instrument fails to perform the intended measurements or shows visible damage.

The PHILIPS PM3350A is provided with a built-in memory back-up circuit. However, the batteries are not factory installed and must be fitted at delivery. Upon power down, only front settings are stored when in analog mode of use, or the front settings and traces are stored when in digital mode. This memory function works when the oscilloscope is switched off from the front panel or when the mains supply is interrupted for more than 20 ms.

To replace or install the memory back-up batteries (2*LR6 Alkaline Penlight), follow these steps:

1. The instrument must be disconnected from the mains (line).

2. Remove the screw that holds the top cover at the rear of the instrument.

3. Gently push the cover backwards until it can be lifted.

4. Remove the cover by lifting it clear of the instrument. The memory battery back-up unit is now accessible, located on the instrument’s rear panel.

5. Ease off the clip that holds the memory back up unit to the chassis.

6. Gently slide the battery holder out of the chassis.

7. Install both batteries in their holders. The installation direction of the batteries is shown on the battery holder.

NOTE: When replacing the memory back-up unit, take care not to damage the wiring in the vicinity of the battery holder.

By pulling both handle ends outwards away from the instrument, the handle can be rotated to allow the following instrument positions:

– Vertically on its rear feet

– Horizontally on its bottom feet

– In two sloping positions on the handle

ATTENTION: Do not position the oscilloscope on any surface which radiates heat, or in direct sunlight. Ensure that the ventilation holes at the rear and top are free from obstruction.

Follow these steps to quickly get started with the PHILIPS PM3350A:

1. Connect the oscilloscope to the mains (line) voltage.

2. Switch the oscilloscope on by means of the push-button POWER LINE ON.

3. Adjust the TRACE ROTATION by means of a screwdriver so that the trace is parallel with the horizontal graticule lines.

4. Connect a probe to input A of the oscilloscope.

5. Connect the other end of the probe to the CAL output of the oscilloscope.

6. Press the AUTO SET key.

The AUTO SET function will automatically set all relevant parameters of the oscilloscope (attenuator setting, time base setting and trigger source setting) for an optimum trace. If you use an attenuator probe (e.g., 10:1 or 100:1), it may be necessary to adjust it for correct compensation according to the instructions in the probe manual.

After switching on the PHILIPS PM3350A with the POWER LINE ON push button, the screen controls can be adjusted for optimum illumination, trace, and spot quality.

– The trace and text intensity is set by the INTENS rotary knob.

– A sharp display is obtained by the FOCUS rotary knob.

– The screwdriver-driven TRACE ROTATION is used to set a grounded trace parallel with the horizontal graticule lines.

– The graticule of the screen can be lit-up by the ILLUMINATION rotary knob, which can be useful in dark environments or for making photographs.

The viewing area of the PHILIPS PM3350A consists of the screen of the Cathode Ray Tube (CRT) and a Liquid Crystal Display (LCD).

The CRT screen is divided in a 10 * 8 divisions area. Each division contains five sub-divisions. On the left side of the CRT screen, four lines are marked with the values 100%, 90%, 10%, and 0%. These marked lines can be used for percentage measurements or rise time measurements.

The LCD indicates all the selected active functions, settings and parameters. Its layout is logically divided into areas according to the keys and knobs. A flashing segment indicates a situation that requires your special attention, for example:

– An incorrect selection of knobs/keys.

– A VAR rotary knob in uncal position.

– The end of a UP-DOWN control range.

– A key has been operated during the PLOT action.

– The DISPL PART UP-DOWN key has been pressed in TB MAGN *1 mode.

– Display of register only.

The UP-DOWN keys on the PHILIPS PM3350A select the required setting out of a range of settings possible for that function. They are used for the attenuator setting, the time base setting, the trigger delay setting and the display part setting.

VERTICAL ATTENUATOR SETTING CHANNEL A & B:

Selection of vertical attenuation of channel A or B.

– Analog: 2 mV/div … 10 V/div in 1-2-5 sequence

– Digital: 2 mV/div … 10 V/div in 1-2-5 sequence

HORIZONTAL TIME-BASE SETTING (TB):

Selection of time-base speed.

– Analog: 0.5 s/div … 50 ns/div in 1-2-5 sequence

– Digital:

– PM3350A: 50 s/div … 0.5 µs/div in 1-2-5 sequence

– PM3355: 50 s/div … 0.2 µs/div in 1-2-5 sequence

– PM3365A: 50 s/div … 20 ns/div in 1-2-5 sequence

– PM3375: 50 s/div … 20 ns/div in 1-2-5 sequence

TRIGGER DELAY SETTING (TRIG DEL):

Selection of trigger delay.

– Analog: not available

– Digital:

– PM3350A: -10 div … +2500 div in 1 div sequence (in TB = 50 s/div … 0.5 µs/div)

– PM3355: -10 div … +5000 div in 1 div sequence (in TB = 50 s/div … 0.2 µs/div)

– PM3365A: -10 div … +2500 div in 1 div sequence (in TB = 50 s/div … 0.5 µs/div), 0 div … +20 div in 1 div sequence (in TB = 0.2 µs/div … 20 ns/div)

– PM3375: -10 div … +5000 div in 1 div sequence (in TB = 50 s/div … 0.2 µs/div), 0 div … +20 div in 1 div sequence (in TB = 0.1 µs/div … 20 ns/div)

DISPLAY PART SETTING (DISPL PART):

Selection of the displayed part of a magnified trace.

– Analog: not available

– Digital: 1/16 … 16/16 sequence depending on TB MAGNIFY value.

The PHILIPS PM3350A features the possibility to select several functions with a single key in sequential order. To obtain the correct function, it is necessary to press the particular key repeatedly until the correct function is visible in the LCD. After the last function in a sequence, the sequence starts again. For example, the A/B key cycles through A, B, and A&B display modes. The TRIG or X SOURCE key cycles through A, AB, B, EXT, and LINE trigger sources.

With the rotary knobs on the PHILIPS PM3350A, a continuously-variable adjustment of the function is obtained. The available rotary knobs and their functions are:

Y POS (A & B): Adjusts the vertical screen position for channel A or channel B.

VAR A / VAR B: Provides variable attenuation for channel A or channel B. It is in the CALibrated position when fully clockwise.

X POS: Adjusts the horizontal screen position for the time-base.

VAR: A variable time-base control (not used in DIGITAL MEMORY mode). It is in the CALibrated position when fully clockwise.

TRIG LEVEL: Sets the trigger level.

HOLD OFF: Adjusts the hold off time. It is in the normal position (minimum HOLD OFF) when fully clockwise.

The five softkeys located below the CRT on the PHILIPS PM3350A are used for different functions in digital memory mode. These functions include AMPLITUDE CALCULATIONS, TIME CALCULATIONS, PROCESS MEASUREMENTS, choice of REGISTER MEMORY and the ZOOM facility. All calculation and manipulation facilities are activated via successive steps through the softkey menu structure. When the menu has been activated, the CRT screen contains two areas for text. The top text area shows all calculation information and channel settings, and the bottom text area shows all functions assigned to the five softkeys.

First, ensure the oscilloscope is operating in analog mode (the DIGITAL MEMORY indication in the LCD is off). If it’s on, press the DIGITAL MEMORY key to turn it off. By pressing the AUTO SET key, the oscilloscope will automatically set the main functions to a near optimal setting. Further adjustments and selections can then be made by operating the various keys and knobs. To use the instrument as an analog oscilloscope, three main functions need to be defined:

1. Vertical mode:

– Select the channel (A, B, or both) with the A/B key.

– Adjust the zero level using the GND key and the Y POS knob.

– Select channel coupling (AC/DC) with the AC/DC key.

– Adjust vertical amplitude with the V…mV UP-DOWN key.

– Use the VAR rotary knob for variable attenuation.

– Select ALTERNATED or CHOPPED display for two signals with the ALT/CHOP key.

– Use the ADD/INVERT key to add, subtract, or invert channel B.

2. Horizontal mode:

– Select X deflection (time-base or X-Y graph) with the X DEFL key.

– Select the horizontal time scale with the TB s…µs UP-DOWN key.

– Use the VAR rotary knob for fine time scale adjustments.

– Expand the time-base 10 times with the X MAGN key.

– Shift the trace horizontally with the X POS knob.

3. Trigger mode:

– Select the time base trigger mode (AUTO, TRIG, SINGLE) with the TB TRIG MODE key.

– Select the trigger source (A, B, A B, EXT, LINE) with the TRIG OR X SOURCE key.

– Adjust the trigger level with the TRIG LEVEL rotary knob.

– Select trigger coupling (P-P, DC, TVF, TVL, LF, HF) with the TRIG COUPL key.

– Select the trigger slope (positive or negative) with the slope key.

– Adjust the hold-off time with the HOLD OFF rotary knob to prevent false triggering.

First, ensure the oscilloscope is operating in digital mode (the DIGITAL MEMORY indication in the LCD is on). If not, press the DIGITAL MEMORY key. Pressing the AUTO SET key will automatically set the main functions for the most convenient setting. Many functions are identical to the analog mode. This section describes the functions available only in digital mode.

1. Vertical Mode:

– Select a dotted or joined (interpolated) display by pressing the DOTS key.

– Load a stored waveform into a register memory (R1, R2, or R3) using the softkeys MEMORY and REGISTERS, then press the LOAD key.

– Display the contents of the display memory and a selected register memory by pressing the DISPLay key.

– View the full settings of the display memory (R0) or a register memory (R1 or R2) by pressing the STATUS key.

2. Horizontal Mode:

– Three digital time-base modes are available: ROLL (for low-frequency signals, 50 s/div to 1 s/div), RECURRENT (for intermediate frequencies), and SAMPLING (for repetitive high-frequency signals, PM3365A/75 only).

– Use the X MAGN key for horizontal magnification of 2, 4, 8, 16, or 32 times.

– Select a part of interest in a magnified signal using the DISPL PART UP-DOWN key.

3. Trigger Mode:

– Use SINGLE SHOT to capture a signal that occurs only once. Press the TB TRIG MODE key to select SINGLE, then press RESET to arm the time-base.

– Use MULTIPLE SHOT to refresh the contents of a selected register memory after a trigger. The display memory is refreshed after the first trigger, and the register memory after the second trigger.

– Set TRIGGER DELAY to view events before (pre-triggering) or after (post-triggering) the trigger point. Use the TRIG DEL UP-DOWN key to adjust the delay.

Amplitude measurements are performed in DIGITAL MODE using the menus and cursors.

Vpp (Peak-to-peak voltage):

1. Enter the CURSORS menu using the softkeys.

2. Select CALCULATE -> AMPL -> VPP.

3. The oscilloscope will automatically measure the peak-to-peak voltage and show the measuring points with two small LOCATE CURSORS. The result is shown in the top text area.

ABS (Absolute voltage):

1. Enter the CURSORS menu -> CALCULATE -> AMPL -> ABS.

2. Ground the trace (GND key) and adjust the zero level anywhere on the screen with the Y POS knob.

3. Press the GND key once again to connect the signal back to the channel. Do not re-adjust the Y POS knob.

4. The measurement is calculated from the MAIN CURSORS to the absolute zero level. The result is shown in the top text area.

RMS (Root mean square voltage):

1. Enter the CURSORS menu -> CALCULATE -> AMPL -> RMS.

2. Ground the trace and adjust the zero level anywhere on the screen with the Y POS knob.

3. Press the GND key once again. Do not re-adjust the Y POS knob.

4. The RMS measurement is calculated between the MAIN CURSORS and related to the absolute zero level. The result appears in the top text area.

MEAN (Mean voltage):

1. Enter the CURSORS menu -> CALCULATE -> AMPL -> MEAN.

2. Ground the trace and adjust the zero level anywhere on the screen with the Y POS knob.

3. Press the GND key once again. Do not re-adjust the Y POS knob.

4. The MEAN measurement is calculated between the MAIN CURSORS and related to the absolute zero level. The result appears in the top text area.

For all measurements, if the VAR rotary knob of the channel is in the CAL position, the result will be in Volts. If it’s in the UNCAL position, the result will be in Divisions.

Time measurements are performed in DIGITAL MODE using the menus and cursors.

FREQ (Frequency):

1. Enter the CURSORS menu -> CALCULATE -> TIME -> FREQ.

2. The oscilloscope automatically measures the period time of the signal and will show the measuring points with two small LOCATE CURSORS. A minimal of one signal period should be covered by the MAIN CURSORS. The result is shown in the right corner of the top text area.

PERIOD:

1. Enter the CURSORS menu -> CALCULATE -> TIME -> PERIOD.

2. The oscilloscope automatically measures the period time of the signal and shows the measuring points. A minimal of one signal period should be covered by the MAIN CURSORS. The result is shown in the top text area.

WIDTH (Pulse width):

1. Enter the CURSORS menu -> CALCULATE -> TIME -> WIDTH.

2. The pulse width is determined on the half peak-to-peak amplitude between the MAIN CURSORS. There must be at least one up-going edge and one down-going edge between the two MAIN CURSORS. The measurement is shown in the right corner of the top text area.

RISE (Rise-time):

1. Enter the CURSORS menu -> CALCULATE -> TIME -> RISE.

2. The oscilloscope automatically measures the rise-time (or fall-time, if the first signal edge is negative-going). The rise-time is determined on the nearest sample to the 10% and 90% level of the amplitude between the MAIN CURSORS. The result is shown in the right corner of the top text area.

The ZOOM and AUTO ZOOM functions are used to magnify a part of a signal while retaining full sample resolution over the selected part.

ZOOM:

1. If part of the signal needs to be examined in more detail, enter the ZOOM menu via the softkeys.

2. The main cursors can be set on the wanted trace and on the signal part of interest, using the CURSOR SELECT menu and the CURSOR CONTROL menu.

3. By entering the ZOOM menu and activating the RESTART function, a new acquisition will be made in the adapted time base setting and delay time. This means that the selected part is resampled using full memory and at a higher sample rate, so higher resolution is used only on the part of interest.

– The REVERSE function resamples at the previous settings (active only after use of the RESTART function).

– The CENTER function sets the MAIN CURSORS horizontally to +2 DIV and -2 DIV from the screen centre.

– The AUTOZOOM softkey accesses the menu where the cursors can be shifted both to the left, away from each other, towards each other or both to the right.

AUTO ZOOM:

This mode simulates a delay time-base function by displaying a main time-base signal and a delayed time-base signal together.

1. The main time-base signal is stored in one of the register memories. First select one of the register memories by pressing the MEMORY and REGISTERS softkeys.

2. Now load the signal to be examined into the selected register memory and display this on the screen.

3. Move the live signal away from the stored signal by use of the channel position control.

4. When AUTO ZOOM is activated, the MAIN CURSORS are set on the stored signal and the LOCATE CURSORS on the live signal. These cursors indicate the part of the signal that is displayed in more detail. The time-base can be shifted across the screen or expanded up or down by means of the softkeys.

The register memories R1, R2, and R3 on the PHILIPS PM3350A make it possible to store different waveforms in the oscilloscope memory. These signals remain stored after power down and can be displayed on the screen whenever needed. A common application is signal comparison.

1. First, select one of the register memories with the REGISTERS menu. This menu is entered by pressing the MEMORY softkey and then pressing the REGISTERS softkey.

2. Now load a reference signal into the selected register memory by pressing the LOAD key. This way all three register memories can be selected and filled with reference signals.

3. Now a measured “live” signal (R0) can be compared with one of the stored reference signals by displaying the signals on screen simultaneously.

4. The measured signal can be moved on the screen by means of the Y POS rotary knob. When the instrument is in the LOCK-mode, the measured signal and the stored signal can be moved on the screen by using the SHIFT function (accessible via the MEMORY menu).

This mode is possible for all versions of the oscilloscope. The analog plot out can be used to make a hard copy of the screen information including all mentioned facilities.

1. Enter the service menu by pressing the MENU key and keeping it pressed. Now also press the AUTO SET key and * becomes visible in the LCD.

2. Press softkey APPL to enter the application preselect menu.

3. Press softkey PLOT.

4. If present, press softkey PLOT-KEY until “plot analog” appears in the top text area of the CRT.

5. Press softkey PLOT-A; this gives access to the set up menu for the analog plot mode. Via this menu the PLOTSPEED (#, range 20 … 2000 ms/dot) for slow-rate limitations and the PENLIFT (#, pen on paper at high or low level) can be adapted to the plotter. Moreover with GRID on, a graticule is plotted.

6. Press the front panel key AUTO SET in order to leave the service menu.

The plot out information becomes available at the 9 pin D-connector at the rear of the oscilloscope. The output signal consists of X and Y deflection signals of 1V (100 mV/div) and the penlift signal at TTL level.

This mode is only possible for the /40 version of the PHILIPS PM3350A. All information on the screen will be plotted out or printed out, including the settings of the displayed traces.

To set up the IEEE-488 interface:

1. Enter the service menu by pressing the MENU key and keeping it pressed. Now also press the AUTO SET key and * becomes visible on the LCD.

2. Press softkey APPL to enter the application preselect menu.

3. Press softkey IEEE to enter the IEEE set up menu.

4. Select the IEEE address with the ADDRESS softkey (0…30).

5. Select the IEEE mode with the T/L softkey (TALKER/LISTENER, TALK ONLY or LISTEN ONLY).

6. Press softkey RETURN.

To set up a digital plotter:

1. From the application preselect menu, press softkey PLOT.

2. Select “plot-digital” in the top text area with softkey PLOT-KEY. This has the result that the digital plot action is started if the front panel PLOT key is pressed.

3. Press softkey PLOT-D to enter the digital plotter menu.

4. Select the plotter type with softkey TYPE; the selected plotter is indicated in the top text area. These types are: PM8153/1, PM8153/6, PM8154 (limited plot-size), PM8155, HP7475A, HP7550.

5. Select the format of the hard copy; can be chosen between 0.5x and 2x the screen size via softkey FORMAT.

6. If you select AUTO:ON, a hard copy is plotted after each single shot.

To set up a dot matrix printer:

1. Select “printer” in the top text area with softkey PLOT-KEY.

2. Press softkey PRINTER to enter the printer menu.

3. Select the printer type with softkey TYPE; the selected printer is indicated in the top text area of the CRT screen. It is possible to choose between FX80 and HP2225.

4. If you select AUTO:ON, a hard copy is printed after each single shot.

5. Press the front panel key AUTO SET once to exit the application preselect menu.

This mode is only possible for the /50 version of the PHILIPS PM3350A oscilloscope. The setup is done as follows, with selections marked with # being plotter/printer dependent.

To set up the RS-232C interface:

1. Enter the service menu by pressing the MENU key and keeping it pressed. Now also press the AUTO SET key and * becomes visible on the LCD.

2. Press softkey APPL to enter the application preselect menu.

3. Press softkey RS232 to enter the RS-232C set up menu.

4. Press softkey BAUDRATE and adjust the OUT-SPD (output speed) to the desired value (#).

5. If a software protocol is used to control communication, also set the INP-SPD (input speed) to the desired value (#).

6. Press softkey RETURN.

7. Press softkey DATA and adjust PARITY, STOP BIT and DATA BIT to the desired value (#).

8. Press softkey RETURN twice.

9. Press softkey PLOT to enter the PLOT menu.

From now on, the set up procedure for a digital plotter and printer is the same as for the IEEE-488 interface, except for the communication parameters which you have just set. Select “plot-digital” or “printer” and configure the device type and format as needed.

Within the Application Preselect Menu, a number of operating functions can be selected that normally do not need to be entered frequently. These functions relate to the SINGLE SHOT mode, TV triggering and adjustment of plotter/printer and interface parameters.

To access the menu:

1. Press MENU and keep it pressed. Now also press AUTO SET.

2. Now the Service menu has been entered, the LCD should indicate “***”.

3. Press APPL, which is one of the CRT softkeys.

4. The CRT should indicate “APPLICATION PRESELECT MENU” on the upper side of the screen.

The selections are made with the softkeys under the CRT. The selected functions are displayed in the top text line of the CRT.

Available selections include:

– PLOT: Enters the plotter and printer parameters menu.

– SNGL_SHOT: In analog single shot mode you can define the single shot sequence when the instrument is in alternated mode (FIRST or MULTI).

– AUTO (TV Triggering After Autoset): Selects the TV trigger mode after an AUTOSET command.

– IEEE (Optional): Defines the IEEE mode and IEEE address.

– RS232 (Optional): Defines the RS-232C parameters (OUTPUT SPEED, INPUT SPEED, PARITY, STOP BIT, DATA BIT).