PHILIPS PM3367A (01) PDF Document

The PHILIPS PM3367A Digital Storage Oscilloscope (DSO) range includes the following easy-to-use features:

– 60 MHz analog oscilloscope for PM3350A and PM3355

– 100 MHz analog oscilloscope for PM3365A and PM3375

– 100 Msamples/s single shot digital acquisition on both channels for PM3350A and PM3365A

– 250 Msamples/s single shot digital acquisition on both channels for PM3355 and PM3375

– Auto Set for instant signal viewing in both analog and digital oscilloscope modes

– Cursors for time and amplitude measurements in digital oscilloscope mode

– Reference memories and non-volatile storage of all waveforms

– Optional interface facilities for remote control and hard copy output

– Storage of 64 front settings

FRONT PANEL CONNECTORS

CAL: Amplitude calibrated output socket.

Ground Symbol: Measuring earth (ground) socket (banana).

A: BNC input socket for channel A with probe indication.

EXT: BNC input socket for channel EXTERNAL.

B: BNC input socket for channel B with probe indication.

REAR PANEL CONNECTORS

Z-MOD: BNC input socket for Z-modulation of the CRT trace.

ANALOG PLOT OUT: Plot output socket to connect the oscilloscope to an analog XY plotter.

LINE IN: Mains (line) input socket including fuse holder.

OPTIONAL REAR PANEL CONNECTORS

IEEE BUS OPTION: Input/output socket to connect the oscilloscope to a IEEE 488/IEC 625 interface.

RS232 BUS OPTION: Input/output socket to connect the oscilloscope to an RS-232C/V24 interface.

For the correct and safe use of the PHILIPS PM3367A, it is essential that both operating and servicing personnel follow generally-accepted safety procedures in addition to the safety precautions specified in the manual. Specific warning and caution statements, where they apply, will be found throughout the manual. Where necessary, warning and caution statements and/or symbols are marked on the apparatus.

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.

You should also be aware of the following symbols:

– A triangle with an exclamation mark means “Read the operating instructions.”

– A circle with a ground symbol inside it indicates a Protective earth (grounding) terminal (black).

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

Before any connection to the inputs is made, the PHILIPS PM3367A must be connected to protective earth (ground) via the three-core mains (line) cable. The mains (line) plug must be inserted only into a socket outlet provided with a protective earth (ground) contact. The protective action must not be negated by the use of an extension cord without a protective conductor.

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

The mains (line) fuseholder is located on the rear panel in the mains (line) input socket. If the mains (line) fuse needs replacing, proceed as follows:

1. Disconnect the instrument from the mains (line).

2. Remove the cover of the fuseholder by means of a screwdriver.

3. Fit a new fuse of the correct rating and refit the cover of the fuseholder.

The mains (line) fuse rating is 1.6 AT delayed-action, 250 V.

WARNING: Make sure that only fuses of the required current and voltage rating, and of the specified type, are used for renewal. The use of the repaired fuses, and/or short-circuiting of the fuseholder, is prohibited.

The PHILIPS PM3367A is provided with a built-in memory back-up circuit, if batteries are fitted. Note that batteries are not factory installed and must be fitted at delivery. The memory back-up batteries (2*LR6 Alkaline Penlight) placement and replacement must be carried out only by a qualified technician.

To replace the batteries:

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 on your PHILIPS PM3367A 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.

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 set all relevant parameters of the oscilloscope (attenuator setting, time base setting, and trigger source setting) for an optimum trace. If you are using an attenuator probe (e.g., 10:1 or 100:1), you may need to adjust it for correct compensation according to the instructions in the probe manual.

After switching on with the POWER LINE ON push button, the screen controls on your PHILIPS PM3367A 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 control 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, this can be used in dark environments or for making photographs.

The UP-DOWN keys on the PHILIPS PM3367A 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.

The PHILIPS PM3367A 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 line, the sequence starts again. An overview of the functions is given in the manual according to their actual positions on the front panel of the oscilloscope.

With the rotary knobs on the PHILIPS PM3367A, continuously-variable adjustment of the function is obtained. Rotary knobs are available for the following functions:

Y POS (A and B): Vertical screen position for channel A and channel B.

VAR A/B: Variable attenuation for channel A and B. It is in CALibrated position when fully clockwise.

X POS: Horizontal screen position for the time-base.

VAR (X POS): Variable time-base (not in DIGITAL MEMORY). It is in CALibrated position when fully clockwise.

TRIG LEVEL: Adjusts the trigger level.

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

First, ensure the oscilloscope is operating in analog mode (DIGITAL MEMORY indication in 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 clear 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:

– Vertical mode

– Horizontal mode

– Trigger mode

In analog vertical mode on the PHILIPS PM3367A, the following adjustments can be made:

Vertical display mode selection: Press the A/B key to select the channel you want to see, either A, B, or A and B simultaneously. If the ADD function is in use, it is possible to switch off the channels A and B.

Adjustment of the absolute zero level: By using the GND key and the Y POS rotary knob, the zero level can be positioned anywhere on the screen. Pressing the GND key interrupts the input signal and grounds the input signal path. With the Y POS rotary knob, the zero level can be adjusted to any level on the screen. Pressing the GND key once again connects the signal to the input. The zero level adjustment is necessary for all DC measurements.

Channel coupling: Pressing the AC/DC key allows you to switch coupling. In AC position, the DC component of the measuring signal is rejected. In DC position, the full bandwidth is available. AC coupling is used when a small AC signal has to be measured that is superimposed on a large DC voltage.

Vertical amplitude adjustment: Operate the V…mV UP-DOWN key for the best setting. The setting can be chosen out of a range from 2 mV up to 10 V per division in a fixed 1-2-5 sequence.

Vertical variable attenuation: Adjust the VAR rotary knob. The UNCAL position is used when the measurement is taken in percentages. With the rotary knob, the measured signal can be set to 100%. For example, for rise-time measurements between 10% and 90% of a waveform’s edge, if a measured square-wave signal has a peak-peak value of 6.2 divisions, it can be attenuated to 5.0 divisions (=100%) by adjusting the VAR rotary knob. As 5 divisions is now 100%, the 10% and 90% levels and the time between these levels can easily be read from the screen.

Selection of ALTERNATED or CHOPPED display: Press the ALT/CHOP key when two signals are displayed. In alternate mode, the CRT beam alternately traces one signal sweep and then the other. In chop mode, the beam chops from one signal to the other at a fast switching frequency.

Selection of ADD, NORMAL or INVERTED display: Press the ADD/INVERT key. “INVERT” is active on channel B. In the ADD mode, channel B is added to channel A (A+B). In the ADD INVERT mode, channel B is subtracted from channel A (A-B).

In analog horizontal mode on the PHILIPS PM3367A, the following selections can be made:

Selection of X deflection or horizontal time-base: Press the X DEFL key. In the X deflection mode, the oscilloscope shows one signal to be displayed as a function of another signal (X-Y graph). The required X-axis signal is selected by the TRIG OR X SOURCE key (A, B, EXT or LINE). The X-Y mode is useful for applications like amplitude vs frequency of circuits, output current vs input voltage of semiconductors, or comparison of frequency or phase shift using Lissajous figures.

In horizontal time-base mode, the display shows the measured signal vs time (Y-t graph). The time coefficient can be selected with the TB s…µs UP-DOWN key.

Selection of horizontal time scale: Use the TB s…µs UP-DOWN key, the VAR rotary knob, or the X MAGN key. The TB s…µs UP-DOWN key allows selection of the time-base speed in a 1-2-5 sequence. With the rotary knob VAR you can make fine adjustments between the 1-2-5 steps. With the X MAGN key you can expand the time-base 10 times. By operating the X POS rotary knob the trace can be shifted across the screen in horizontal direction.

In analog trigger mode on the PHILIPS PM3367A, the following selections can be made:

Time-base trigger mode: By using the TB TRIG MODE key, the time base can operate in three modes:

– AUTO: The horizontal sweep normally starts when a trigger occurs. If no trigger is detected within 100 ms after the last sweep, then a sweep start automatically occurs. This means a trace is always visible on the display.

– TRIG: Horizontal sweep will only start on a trigger pulse derived from the selected trigger source.

– SINGLE: Horizontal sweep runs only once after it is armed by the RESET key and upon receipt of a trigger pulse. This mode is very useful to capture single events.

Trigger source selection: By pressing the TRIG OR X SOURCE key, you can select from: A (channel A), A B (composite channel A and B), B (channel B), EXT (channel EXTERNAL), or LINE (50 Hz or 60 Hz sine-wave derived from the line voltage).

Trigger level: Adjust the TRIG LEVEL rotary knob. For repetitive signals, a stable, jitter-free display will only be obtained if each time-base sweep is triggered at precisely the same point on the signal waveform.

Trigger coupling: Use the TRIG COUPL key to select one of six modes:

– P-P: Peak-to-peak triggering gives automatic ranging of the TRIG LEVEL knob, the ranging being determined by the peak-to-peak value of the signal. DC signals are rejected.

– DC: The full bandwidth of the trigger channel is available, while the level range of the rotary knob is more than +/- 8 divisions.

– TVF: TV frame triggering allows triggering at the slow TV frame (field) synchronisation pulses.

– TVL: TV line triggering allows triggering at the fast TV line synchronisation pulses.

– LF: The signal used for triggering is first passed through a low-pass filter with a cut-off frequency of 50 kHz. All components with high frequencies are rejected.

– HF: The signal used for triggering is first passed through a high-pass filter with a cut-off frequency of 50 kHz. All components with low frequencies are rejected.

Trigger slope selection: Press the slope key to select a positive-going slope or a negative-going slope.

Hold-off time: Use the HOLD OFF rotary knob to prevent “false” triggering and “double writing” when examining multiple pulse signals. Adjustment of the HOLD OFF knob enables triggering to be synchronized on the same pulse in the pulse train and so gives a stable display.

To use the instrument as a digital storage oscilloscope, first ensure it is operating in digital mode (DIGITAL MEMORY indication in LCD is on). If not, press the key DIGITAL MEMORY. By pressing the AUTO SET key, the oscilloscope will automatically set the main functions to the most convenient setting.

Further adjustments can be made by operating the keys. In DIGITAL MEMORY mode, there are more functions available than in analog mode. The analog functions which are not available in DIGITAL MEMORY mode are: ADD, ALT/CHOP, COMP TRIG, X VAR.

The main functions to be defined are:

– Vertical mode

– Horizontal mode

– Trigger mode

The PHILIPS PM3367A has two types of memory in digital mode: a display memory, which you see in normal operation, and three register memories (R1, R2, R3), which are used to store reference waveforms.

Loading of register memory: To store a waveform in a register, first select a destination register R1 or R2 or R3. This is done by operating the softkeys MEMORY and REGISTERS. When one of these registers is chosen, you only have to press the LOAD key to store the signal into the register. Provided the oscilloscope is equipped with a battery back-up, the waveforms in all registers are still stored after power down for recall at the next power up.

Display of register memory: Pressing the DISPLay key once will show the contents of the display memory and the selected register memory (R1 or R2 or R3) together on the screen. The two signals can be compared with each other. Pressing the DISPLay key a second time will show only the contents of the selected register memory (R1 or R2 or R3). Pressing the DISPLay key a third time will result in displaying the contents of the display memory again.

Status of register memory: Pressing the STATUS key once and keeping it pressed enables the LCD to show the full settings of the selected register memory (R1 or R2 or R3). Pressing the STATUS key twice within one second and keeping it pressed, the LCD will show the complete settings of the display memory (R0).

In digital horizontal mode on the PHILIPS PM3367A, the time-base has three modes:

ROLL (PM3350A/55/65A/75):

– 50 s/div … 1 s/div

– In ROLL mode the screen build-up is from right to left.

– This mode is used for lower frequency signals, such as monitoring reference voltage drift in an amplifier over periods of several hours. The signal is built up point-by-point at the right-hand side of the screen and moves to the left.

RECURRENT:

– PM3350A/65A: 0.5 s/div … 0.5 µs/div

– PM3355/75: 0.5 s/div … 0.2 µs/div

– In RECURRENT mode the screen build-up is from left to right. Signals with intermediate frequencies can be made visible. The signal is sampled at fixed time intervals, the length of which depends on the time-base setting.

SAMPLING (PM3365A/75 only):

– PM3365A: 0.2 µs/div … 20 ns/div

– PM3375: 0.1 µs/div … 20 ns/div

– In SAMPLING mode repetitive signals are needed for a screen build-up from left to right. Higher frequency signals can now be captured up to the full bandwidth of the oscilloscope, provided that the signal consists of repetitive and identical pulses. With sequential sampling, one point along the waveform is sampled per sweep until enough points are acquired by the display memory.

The TRIGGER DELAY setting on the PHILIPS PM3367A, adjusted by the TRIG DEL UP-DOWN key, offers PRE- and POST triggering in digital mode.

PRE triggering: You can look BEFORE the trigger point. For example, if trigger delay = -10 divisions, the trigger point is at the far RIGHT vertical graticule line. What you see is then the signal BEFORE the trigger point. This mode enables observation of events leading up to the trigger; e.g. to pin-point the cause of a problem, for instance, a mains (line) transient.

Trigger delay = 0: The trigger point is at the LEFT vertical graticule line.

POST triggering: You can look AFTER the trigger point. For example, if trigger delay = +10 divisions, the trigger point is one full screen LEFT of the screen that you see. This mode effectively stretches the memory capacity and is for example very useful when measuring a certain line in a TV pattern.

The maximum PRE and POST trigger divisions vary depending on the specific model of your PHILIPS PM3367A.

NOTE: You can return to the default value of 0 divisions trigger delay by pressing the TRIG DEL key and then the RESET key simultaneously.

The menus and cursor measurements on your PHILIPS PM3367A are only available in DIGITAL MODE. When in digital mode, the text on the CRT can be activated by pressing one of the five softkeys that are positioned under the CRT.

MAIN MENU:

This menu is mainly used to activate the extensive CURSORS menu, the PROCESS menu, or the MEMORY menu. Other selections are:

– SETTINGS: When active, this menu displays the vertical and time base settings relating to the displayed traces.

– TEXT-OFF: When this key is pressed, all text disappears from the screen. The text is placed on the screen again by pressing one of the five softkeys.

From the main menu, you can access sub-menus for specific functions:

– CURSORS menu: Activate cross-shaped MAIN CURSORS which are positioned on the waveform. The CONTROL menu moves the MAIN CURSORS, and the SELECT menu chooses which cursor to move.

– CALCULATE menu: Pre-select either AMPLITUDE or TIME measurements.

– ZOOM menu: Magnify a part of the signal while retaining full sample resolution.

– PROCESS menu: Define which of the two processes, AVERAGE or ENVELOPE, is activated.

– MEMORY menu: An intermediate menu to choose between the FRONTS menu, REGISTERS menu, and SHIFT menu.

To perform amplitude measurements on your PHILIPS PM3367A in digital mode, use the CURSORS and CALCULATE-AMPLITUDE menus.

Vpp (Peak-to-peak voltage):

The Vpp amplitude measurement is calculated over the signal lying between the MAIN CURSORS. Activate the Vpp calculation function, and the oscilloscope will automatically measure the peak-to-peak voltage and will show the measuring points by two small LOCATE CURSORS. The result is shown in the top text area in Volts (if VAR knob is in CAL position) or Divisions (if in UNCAL position).

ABS (Absolute):

The ABS amplitude measurement is calculated from the MAIN CURSORS related to the absolute zero level. The correct way to use this function is:

1. Activate the ABS function.

2. Ground the trace and adjust the zero level anywhere on the screen by means of the Y POS rotary knob.

3. Press the GND key once again (the signal is now connected to the channel).

4. Do not re-adjust the Y POS rotary knob anymore.

RMS (Root mean square voltage):

The RMS measurement is calculated between the MAIN CURSORS and related to the absolute zero level. The procedure is the same as for ABS measurement.

MEAN (Mean voltage):

The MEAN measurement is calculated between the MAIN CURSORS and related to the absolute zero level. The procedure is the same as for ABS and RMS measurement.

To perform time measurements on your PHILIPS PM3367A in digital mode, use the CURSORS and CALCULATE-TIME menus. It is necessary to set the main cursors on the wanted trace using the CURSOR-CONTROL menu.

FREQ (Frequency):

The FREQ measurement is calculated between the MAIN CURSORS. By activating the FREQ calculation function, the oscilloscope will automatically measure the period time of the signal and will show the measuring points by two small LOCATE CURSORS. Minimal one signal period should be covered by the MAIN CURSORS.

PERIOD:

The PERIOD measurement is calculated between the MAIN CURSORS. By activating the PERIOD calculation function, the oscilloscope will automatically measure the period time of the signal and will show the measuring points by two small LOCATE CURSORS. Minimal one signal period should be covered by the MAIN CURSORS.

WIDTH (Pulse width):

The WIDTH measurement is calculated between the MAIN CURSORS. By activating the WIDTH calculation function, the oscilloscope will automatically measure the pulse width of the first pulse seen from the left cursor. The pulse width is determined on the half peak-to-peak amplitude between the MAIN CURSORS. There must be at least one upgoing edge and one downgoing edge between the two MAIN CURSORS.

RISE (Rise-time):

The RISE (or FALL) measurement is calculated between the MAIN CURSORS. By activating the RISE calculation function, the oscilloscope will automatically measure the rise-time (or the fall-time, if the first signal edge is negative-going) of the first signal edge seen from the left cursor. The rise-time is determined on the nearest sample to the 10% and the 90% level of the amplitude between the MAIN CURSORS.

The ZOOM and AUTO ZOOM functions on the PHILIPS PM3367A are used to magnify a part of a signal while retaining full sample resolution over the selected part.

ZOOM:

If part of the signal needs to be examined in more detail, the ZOOM function can be used. 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. Then, by entering the ZOOM menu and activating the RESTART function, if within the limits of time base and delay range, a new acquisition will be made in the adapted time base setting and delay time. This means that the the selected part is resampled using full memory and at a higher sample rate and so higher resolution is used only on the part of interest.

AUTO ZOOM:

In this mode it is possible to simulate the operation of a delay time-base function by displaying a main time-base signal and a delayed time-base signal together on the screen. The main time-base signal is stored in one of the register memories. 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 and can be shifted across the screen or the time-base can be expanded up or down by means of the softkeys.

The register memories R1, R2 and R3 on your PHILIPS PM3367A make it possible to store different waveforms in the oscilloscope memory. These signals remain stored after power down and can be displayed on screen whenever needed. A possible 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. In 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. But 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 (see page 4-44).

This mode is possible for all versions of the PHILIPS PM3367A oscilloscope. To set up for an analog plot:

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 select menu.

3. Press softkey PLOT.

4. If present, press softkey PLOT-KEY until “plot analog” appears in the top text area of the CRT. This has the result that the analog plot action is started if the front panel key PLOT is pressed.

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

The plot output 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 oscilloscope. The set up is done as follows:

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.

7. Press softkey PLOT.

For a Digital Plotter:

1. 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 key PLOT is pressed.

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

3. Select the plotter type with softkey TYPE; the selected plotter is indicated in the top text area.

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

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

For a Dot Matrix Printer:

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

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.

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

Finally, press front panel key AUTO SET once to exit the application preselect menu.

This mode is only possible for the /50 version of the oscilloscope. The set up is done as follows:

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 digital plotter and printer is different; first the procedure for digital XY plotter is explained.

For a Digital Plotter:

1. 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 key PLOT is pressed.

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

3. Select the plotter type with softkey TYPE; the selected plotter is indicated in the top text area.

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

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

For a Dot Matrix Printer:

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

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.

4. If you select AUTO:ON, a hard copy is plotted out after each single shot and re-arming.

Finally, press front panel key AUTO SET to return to normal oscilloscope use.