PHILIPS PM3365A (01) PDF Document

Upon receiving your PHILIPS PM3365A, you should check the contents of the shipment for completeness and note whether any damage has occurred during transport. The following parts should be included:

– 1 Oscilloscope

– 2 Batteries

– 1 Front Cover (for 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 there is damage, a claim should be filed with the carrier immediately, and the Philips/Fluke Sales or Service organisation should be notified in order to facilitate the repair or replacement of the instrument.

The PHILIPS PM3365A Digital Storage Oscilloscope (DSO) has 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

For correct and safe use of the PHILIPS PM3365A, it is essential that both operating and servicing personnel follow generally-accepted safety procedures in addition to the safety precautions specified in the manual. Pay attention to the following:

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.

Always read the operating instructions before use. The instrument must be connected to protective earth (ground) via the three-core mains cable. Any interruption of the protective conductor inside or outside the instrument is likely to make the instrument dangerous. Intentional interruption is prohibited.

Whenever it is likely that safety protection has been impaired, the PHILIPS PM3365A 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.

Follow these steps to quickly start using your PHILIPS PM3365A:

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 (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 PM3365A 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 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, which can be useful in dark environments or for making photographs.

A flashing segment on the Liquid Crystal Display (LCD) of your PHILIPS PM3365A indicates a situation that requires your special attention. Examples include:

– An incorrect selection of knobs/keys controls.

– A VAR rotary knob is in an uncalibrated position.

– The end of a UP-DOWN control range has been reached.

– A key has been operated during the PLOT action.

– The DISPL PART UP-DOWN key has been pressed in TB MAGN x1 mode.

– Display of register only.

The UP-DOWN keys select the required setting out of a range of settings for a particular function. The ranges are as follows:

The PHILIPS PM3365A 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 the line, the sequence starts again. An overview of the functions is given by the positions of the keys on the front panel of the oscilloscope.

The rotary knobs on the PHILIPS PM3365A provide continuously-variable adjustment of functions. The available rotary knobs are:

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

VAR A: Variable attenuation for channel A (in CALibrated position when fully clockwise).

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

VAR B: Variable attenuation for channel B (in CALibrated position when fully clockwise).

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

VAR (X): Variable time-base, not used in DIGITAL MEMORY mode (in CALibrated position when fully clockwise).

TRIG LEVEL: Sets the trigger level.

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

To use the PHILIPS PM3365A as an analog oscilloscope, first ensure it is operating in analog mode (the DIGITAL MEMORY indication in the LCD should be off). If it is 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 can then be made using the various keys and knobs. The three main functions to define are Vertical mode, Horizontal mode, and Trigger mode.

In analog vertical mode on the PHILIPS PM3365A, the following adjustments can be made:

– Vertical display mode selection: Press the A/B key to select the channel you want to see: A, B, or A and B simultaneously.

– Adjustment of the absolute zero level: Press the GND key to interrupt the input signal and ground the input path. With the Y POS rotary knob, the zero level can be positioned anywhere on the screen. This is necessary for all DC measurements.

– Channel coupling: Press the AC/DC key. In the AC position, the DC component of the signal is rejected. In the DC position, the full bandwidth is available. AC coupling is used when a small AC signal must 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 range is 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. For example, for rise-time measurements between 10% and 90%, if a signal has a peak-peak value of 6.2 divisions, it can be attenuated to 5.0 divisions (100%) by adjusting the VAR knob. The 10% and 90% levels can then be easily read from the screen.

– Selection of ALTERNATED or CHOPPED display: When two signals are displayed, press the ALT/CHOP key. 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 ADD mode, channel B is added to channel A (A + B). In ADD INVERT mode, channel B is subtracted from channel A (A – B), which is useful for rejecting common-mode signals.

In analog horizontal mode on the PHILIPS PM3365A, you can make the following selections:

– Selection of X deflection or horizontal time-base: Press the X DEFL key. In X deflection mode (X-Y graph), the oscilloscope shows one signal displayed as a function of another signal. In horizontal time-base mode (Y-t graph), the display shows the measured signal versus time.

– Selection of horizontal time scale: Use the TB s…µs UP-DOWN key to select the time-base speed in a 1-2-5 sequence. Use the rotary knob VAR to make fine adjustments between the 1-2-5 steps. Use the X MAGN key to expand the time-base 10 times. The X POS rotary knob can be used to shift the trace horizontally across the screen.

To adjust the trigger settings in analog mode on your PHILIPS PM3365A, you can make the following selections:

– Time-base trigger mode: Press the TB TRIG MODE key to select between AUTO, TRIG, and SINGLE. In AUTO mode, a sweep starts automatically if no trigger is detected within 100 ms. In TRIG mode, the sweep only starts on a valid trigger. In SINGLE mode, the sweep runs only once after being armed by the RESET key.

– Trigger source selection: Press the TRIG OR X SOURCE key to select the trigger source from channel A, B, composite A B, channel EXTERNAL, or LINE (50 Hz or 60 Hz sine-wave derived from the line voltage).

– Trigger level: Adjust the TRIG LEVEL rotary knob to set the voltage level on the signal waveform where the sweep should start.

– Trigger coupling: Press the TRIG COUPL key. Six modes are available: P-P, DC, TVF (TV frame), TVL (TV line), LF (low-pass filter), and HF (high-pass filter).

– Trigger slope selection: Press the slope key to select triggering on 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. This inhibits the trigger for a period of time after a completed sweep.

To use the PHILIPS PM3365A as a Digital Storage Oscilloscope, first ensure it is operating in the 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 should be made by operating the keys. In DIGITAL MEMORY mode there are more functions available than in the 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, and Trigger mode.

The PHILIPS PM3365A has two types of memory in digital mode: a display memory (for normal operation) and three register memories (R1, R2, R3) used to store reference waveforms. Waveforms in registers are still stored after power down due to a battery back-up.

– Loading of register memory: To store a waveform in a register, first select a destination register (R1, R2, or R3) using 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.

– Display of register memory: Pressing the DISPLay key once will show the contents of the display memory and the selected register memory (R1, R2 or R3) together on the screen. A second press will show only the contents of the selected register memory. A third press 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. Pressing the STATUS key twice within one second and keeping it pressed will show the complete settings of the display memory (R0).

In digital horizontal mode, the PHILIPS PM3365A has three time-base modes:

– ROLL: 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.

– RECURRENT: 0.5 s/div … 0.5 µs/div (PM3350A/65A) or 0.5 s/div … 0.2 µs/div (PM3355/75). In RECURRENT mode, the screen build-up is from left to right.

– SAMPLING: 0.2 µs/div … 20 ns/div (PM3365A) or 0.1 µs/div … 20 ns/div (PM3375). In SAMPLING mode, repetitive signals are needed for a screen build-up from left to right.

To magnify a portion of the waveform, press the X MAGN key for horizontal magnification of 2, 4, 8, 16, or 32 times. Any part of interest in a magnified signal may be selected for display by the DISPL PART UP-DOWN key. The displayed waveform will scroll across the screen in the selected direction.

By pressing the TRIG DEL UP-DOWN key, the trigger delay setting on the PHILIPS PM3365A offers PRE- and POST-triggering.

– PRE-triggering: This allows you to 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.

– POST-triggering: This allows you to look AFTER the trigger point. For example, if trigger delay = +10 divisions, the trigger point is one full screen LEFT of the screen than 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-triggering for all models is 10 divisions. The maximum POST-triggering for the PM3350A/65A is 2500 divisions, and for the PM3355/75 it is 5000 divisions.

In digital mode on the PHILIPS PM3365A, measurements are performed using the softkeys located under the CRT. Pressing one of the five softkeys activates a menu. The function RETURN can be found in many menus and if activated it will result in a return to the previous level in the menu structure.

– MAIN MENU: This menu is mainly used to activate the extensive CURSORS menu, the PROCESS menu, or the MEMORY menu. It also includes SETTINGS (displays vertical and time base settings) and TEXT-OFF (removes all text from the screen).

– CURSORS menu: Once activated, two cross-shaped MAIN CURSORS are positioned on the waveform. These cursors can be moved horizontally and vertically to select a portion of the waveform for measurement. Small LOCATE cursors are placed on the waveform to indicate exactly where the measurement is being calculated.

– CALCULATE menu: From the CURSORS menu, you can enter the CALCULATE menu to perform AMPLITUDE or TIME measurements. This menu provides functions for automated calculations like Vpp, RMS, MEAN, FREQ, PERIOD, WIDTH, and RISE.

To perform an amplitude measurement on the PHILIPS PM3365A, use the digital mode menus. Here are the steps for different types of amplitude measurements:

– Vpp (Peak-to-peak voltage): Activate the Vpp calculation function. The oscilloscope will automatically measure the peak-to-peak voltage over the signal lying between the MAIN CURSORS and will show the measuring points by two small LOCATE CURSORS.

– ABS (Absolute voltage): The ABS amplitude measurement will be calculated from the MAIN CURSORS related to the absolute zero level. This zero level is indicated as a horizontal dotted line and is related to the grounded Y position. To use this function correctly: activate the ABS function, ground the trace and adjust the zero level anywhere on the screen, then press the GND key once again. Do not re-adjust the Y POS rotary knob anymore.

– RMS (Root mean square voltage): This measurement is calculated between the MAIN CURSORS and related to the absolute zero level. Similar to the ABS measurement, you must first establish the ground reference level correctly.

– MEAN (Mean voltage): This measurement is calculated between the MAIN CURSORS and related to the absolute zero level. The procedure is the same as for ABS and RMS measurements.

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

To perform a time measurement on the PHILIPS PM3365A, use the digital mode menus. Here are the steps for different types of time measurements:

– FREQ (Frequency): The FREQ measurement is calculated between the MAIN CURSORS. Activate the FREQ calculation function and the oscilloscope will automatically measure the period time of the signal and will show the measuring points by two small LOCATE CURSORS. A minimal of one signal period should be covered by the MAIN CURSORS.

– PERIOD: The PERIOD measurement is calculated between the MAIN CURSORS. Activate the PERIOD calculation function. A minimal one signal period should be covered by the MAIN CURSORS.

– WIDTH (Pulse width): The WIDTH measurement is calculated between the MAIN CURSORS. Activate the WIDTH calculation function and 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.

– RISE (Rise-time): The RISE (or FALL) measurement is calculated between the MAIN CURSORS. Activate the RISE calculation function. The rise-time is determined on the nearest sample to the 10% and the 90% level of the amplitude between the MAIN CURSORS.

Results are shown in the top text area of the screen.

The ZOOM and AUTO ZOOM functions on the PHILIPS PM3365A 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. When the distance between the LOCATE CURSORS is less than 3 divisions or more than 9 divisions, then the time-base is automatically set to a more suitable setting.

The register memories R1, R2 and R3 on the PHILIPS PM3365A make it possible to store different waveforms in the oscilloscope memory for signal comparison. To compare a live signal with a stored one, follow these steps:

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.

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.

The PHILIPS PM3365A has facilities to make a hard copy of the information on the CRT via a plotter or a printer. The plot out can consist of the recorded waveform(s), the belonging oscilloscope settings, the trace identification, cursors, results of measurements and a measuring graticule.

To plot or print, you first need to enter the APPLICATION preselect menu. This is done by performing the following action: press the front panel key MENU and keep it pressed. Then press AUTO SET. After this, press the APPL softkey to enter the menu.

The plot action is started by pressing the front panel PLOT key. Please note that during the plot action the signal acquisition stops and all softkeys are inactive. Plotting can be stopped by pressing the PLOT key again.

The setup procedure depends on whether you are using an analog XY plotter, an IEEE-488 interface, or an RS-232C interface.

The PHILIPS PM3365A is provided with a built-in memory back-up circuit, if batteries are fitted. 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. This unit is 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.