PHILIPS PM3352A (01) PDF Document

Upon receiving your PHILIPS PM3352A, you should perform an initial inspection. Check the contents of the shipment for completeness against the shipment note and look for any damage that may have occurred during transport. If the contents are incomplete, or if there is damage, a claim should be filed with the carrier immediately, and the Philips/Fluke Sales or Service organisation should be notified to facilitate repair or replacement.

The PHILIPS PM3352A Digital Storage Oscilloscope (DSO) range features the following capabilities:

– 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

To get started with your PHILIPS PM3352A, follow these steps:

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

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

3. Adjust the TRACE ROTATION using 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 configure all relevant parameters of the oscilloscope (attenuator setting, time base setting, and trigger source setting) for an optimal trace. If you are using an attenuator probe (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 the PHILIPS PM3352A, you can adjust the screen controls for optimal viewing:

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

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

– The screwdriver-driven TRACE ROTATION control 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 is useful in dark environments or for making photographs.

The front panel of the PHILIPS PM3352A has the following connectors:

CAL: An amplitude calibrated output socket providing a 1.2 V(p-p), 2 kHz approx. square-wave voltage. It is used for probe compensation or to calibrate the vertical deflection AMPL control.

Ground Socket (Banana): Provides a measuring earth (ground) connection.

A: BNC input socket for channel A. It includes a probe indication feature that identifies the attenuation of a connected probe and compensates the LCD display for vertical deflection (only active with probes that have this feature).

B: BNC input socket for channel B, with the same probe indication feature as channel A.

EXT: BNC input socket for an external trigger signal. When EXT input is selected via the time-base, the signal input here is used for external triggering. When EXT is selected via X DEFL, the horizontal deflection is determined by the signal applied to this socket.

The standard rear panel connectors on the PHILIPS PM3352A are:

Z-MOD: BNC input socket for Z-modulation of the CRT trace. The trace is blanked when this input is “high” (> +2.5 V). The input range is 0 V to +12 V.

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

LINE IN: Mains (line) input socket, which also includes the fuse holder.

Optional rear panel connectors include:

IEEE BUS OPTION: An input/output socket to connect the oscilloscope to an IEEE 488/IEC 625 interface.

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

To use the PHILIPS PM3352A as an analog oscilloscope, first ensure it is in analog mode (the DIGITAL MEMORY indication in the LCD is off). If it is on, press the DIGITAL MEMORY key to switch to analog mode. You can press the AUTO SET key to get an optimal initial setting. Further adjustments are made via the keys and knobs. The three main functions to define are:

1. Vertical mode: Control vertical display, position, coupling, and amplitude.

2. Horizontal mode: Control the time base or X-Y display.

3. Trigger mode: Control when the sweep starts.

In analog mode on the PHILIPS PM3352A, you can make the following vertical adjustments:

– Vertical display mode selection: Press the A/B key to select which channel you want to see: A, B, or both A and B simultaneously. If both are selected, you can press the ALT/CHOP key to select between alternate and chopped display modes.

– Adjustment of the absolute zero level: Press the GND key to interrupt the input signal and ground the path. Use the Y POS rotary knob to position the zero level anywhere on the screen. This is necessary for all DC measurements. Press GND again to reconnect the input.

– Channel coupling: Press the AC/DC key to select the coupling. In AC position, the DC component of the signal is rejected. In DC position, the full bandwidth is available. AC coupling is used when a small AC signal is superimposed on a large DC voltage.

– Vertical amplitude adjustment: Use the V…mV UP-DOWN key for the desired channel to select the vertical sensitivity from 2 mV to 10 V per division in a fixed 1-2-5 sequence.

– Vertical variable attenuation: Adjust the VAR rotary knob to continuously attenuate the signal. This is useful for measurements in percentages, such as rise-time measurements. When the VAR knob is not in the calibrated (fully clockwise) position, the “UNCAL” indication “>” flashes in the LCD.

– ADD, NORMAL or INVERTED display: Press the ADD/INVERT key. 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 like hum.

In horizontal mode on your PHILIPS PM3352A, you can make the following selections:

– Selection of X deflection or horizontal time-base: Press the X DEFL key. In X deflection mode, the oscilloscope shows one signal as a function of another (X-Y graph). The X-axis signal is selected with the TRIG OR X SOURCE key (A, B, EXT, or LINE). In horizontal time-base mode, the display shows the measured signal versus time (Y-t graph).

– Selection of horizontal time scale: In time-base mode, use the TB s…µs UP-DOWN key to select the time coefficient in a 1-2-5 sequence.

– Fine adjustments: Use the rotary VAR knob for fine adjustments between the 1-2-5 steps.

– Magnification: Press the X MAGN key to expand the time-base 10 times.

– Horizontal position: Use the X POS rotary knob to shift the trace across the screen.

On the PHILIPS PM3352A, you can set the trigger mode as follows:

Time-base trigger mode (using TB TRIG MODE key):

– AUTO: The horizontal sweep normally starts when a trigger occurs. If no trigger is detected within 100 ms after the last sweep, a sweep is started automatically. A trace is always visible.

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

– SINGLE: The horizontal sweep runs only once after it is armed by the RESET key and a trigger pulse is received. This is useful for capturing single events.

Trigger source selection (using TRIG OR X SOURCE key):

– A: Channel A

– B: Channel B

– A B: Composite channel A and channel B (only possible in alternated display mode).

– EXT: Channel EXTERNAL

– LINE: 50 Hz or 60 Hz sine-wave derived from the line voltage.

Trigger coupling (using TRIG COUPL key):

– P-P: Peak-to-peak triggering with automatic ranging of the trigger level. DC signals are rejected.

– DC: The full bandwidth of the trigger channel is available. The level range is more than ± 8 divisions.

– TVF: TV frame triggering for slow TV frame (field) synchronisation pulses.

– TVL: TV line triggering for fast TV line synchronisation pulses.

– LF: The signal is passed through a low-pass filter with a cut-off of 50 kHz. High frequencies are rejected.

– HF: The signal is passed through a high-pass filter with a cut-off of 50 kHz. Low frequencies are rejected.

Trigger level: Adjust the TRIG LEVEL rotary knob to set the voltage level on the waveform where triggering will occur.

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

Hold-off time: Use the HOLD OFF rotary knob to inhibit triggering for a set period after a sweep. This is used to prevent “false” triggering and achieve a stable display on complex repetitive signals.

To use the PHILIPS PM3352A in digital mode, first ensure 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 starting point. Many functions are identical to the analog mode. However, in digital mode, some analog functions are not available (ADD, ALT/CHOP, COMP TRIG, X VAR), and new digital functions become available. The main functions to define are:

1. Vertical mode: Includes digital-specific choices like dotted or joined display.

2. Horizontal mode: Includes digital time-base modes like ROLL, RECURRENT, and SAMPLING.

3. Trigger mode: Includes digital features like SINGLE SHOT, MULTIPLE SHOT, and PRE/POST triggering.

The PHILIPS PM3352A has two types of memory in digital mode: a display memory (for the current acquisition) and three register memories (R1, R2, R3) for storing reference waveforms. Waveforms in the registers are stored even after power down if the battery back-up is installed.

– Loading of register memory: To store a waveform, first select a destination register (R1, R2, or R3) using the softkeys MEMORY and REGISTERS. Then, press the LOAD key to store the signal from the display memory into the selected 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 for comparison. Pressing it a second time shows only the selected register memory. A third press returns to showing only the display memory.

– Status of register memory: Pressing the STATUS key once and holding it enables the LCD to show the full settings of the selected register memory. Pressing it twice within one second and holding it will show the complete settings of the display memory (R0).

The digital time-base on the PHILIPS PM3352A has three modes:

– ROLL (50 s/div … 1 s/div): For low-frequency signals. The screen build-up is from right to left. This mode is often used for monitoring slow-changing signals or voltage drift over time.

– RECURRENT (0.5 s/div … 0.5 µs/div or 0.2 µs/div): In this mode, the signal is sampled at fixed time intervals, and the sampled values are written in the display memory. The screen build-up is from left to right.

– SAMPLING (0.2 µs/div … 20 ns/div or 0.1 µs/div … 20 ns/div): For high-frequency repetitive signals. With sequential sampling, one point along the waveform is sampled per sweep until enough points are acquired to display the full waveform. This allows for capturing signals up to the full bandwidth of the oscilloscope.

You can also use the X MAGN key to get a horizontal magnification of 2, 4, 8, 16, or 32 times. A part of interest in a magnified signal may be selected for display by the DISPL PART UP-DOWN key.

The TRIGGER DELAY setting on the PHILIPS PM3352A, adjusted with the TRIG DEL UP-DOWN key, allows for PRE- and POST triggering in digital mode.

– PRE triggering: This lets you look BEFORE the trigger point. For example, if you set a trigger delay of -10 divisions, the trigger point is at the far RIGHT vertical graticule line. This allows you to observe events that lead up to a trigger, such as a mains (line) transient. The PM3350A/55/65A/75 models have a maximum PRE triggering of 10 divisions (TRIG DEL = -10 div).

– POST triggering: This lets you look AFTER the trigger point. For example, with a trigger delay of +10 divisions, the trigger point is one full screen LEFT of the screen you see. This effectively stretches the memory capacity and is useful for measuring a specific line in a TV pattern. The PM3350A/65A has a maximum POST triggering of 2500 divisions, while the PM3355/75 has a maximum of 5000 divisions.

A trigger delay of 0 divisions places the trigger point at the LEFT vertical graticule line. You can return to the default value of 0 divisions by pressing the TRIG DEL key and then the RESET key simultaneously.

In digital mode, the PHILIPS PM3352A offers extensive measurement capabilities via softkey menus located under the CRT. The main menu is activated and provides access to several sub-menus:

– CURSORS: Activates two cross-shaped cursors for manual measurements on the waveform. You can control the cursors to measure amplitude and time.

– CALCULATE (within CURSORS menu): This menu allows for automatic measurements.

– AMPLITUDE menu: Calculates Vpp (peak-to-peak), RMS (root mean square), MEAN, and ABS (absolute) voltage.

– TIME menu: Calculates FREQ (frequency), PERIOD, WIDTH (pulse width), and RISE (rise-time).

– PROCESS: This menu allows you to activate AVERAGE or ENVELOPE functions to reduce noise or capture signal variations over time.

– MEMORY: Used to manage the three reference register memories (R1, R2, R3) and the 64 front panel settings memories.

– ZOOM: Magnifies a part of the signal between the cursors for detailed examination at full sample resolution.

– SETTINGS: Displays the vertical and time base settings for all active and stored traces.

– TEXT-OFF: Removes all text from the screen for a clear view of the waveform.

The AVERAGE and ENVELOPE functions are available in the PROCESS menu in digital mode on your PHILIPS PM3352A. Only one of these processes can be active at a time.

AVERAGE:

This function suppresses noise without losing bandwidth. Every dot is calculated after every sweep based on the new and previous values. You can select an average-factor ‘C’ (2, 4, 8, 16, 32, 64, 128, or 256); a larger C results in slower dot positions change and more noise reduction. The process is continuous until switched off. It starts when the INIT softkey is pressed or when triggering/amplitude control is changed. In ROLL mode or AUTOZOOM, AVERAGE is temporarily suspended.

ENVELOPE:

This function stores the minimum and maximum of each sample position over multiple sweeps. The envelope is stored in a reference register (R1, R2, or R3) and displayed with the acquired signal. It is a continuous process until switched off and is restarted with the INIT softkey or when trigger/amplitude control is changed. In ROLL mode or AUTOZOOM, ENVELOPE is temporarily suspended. Redefining the reference register will stop the ENVELOPE process.

The PHILIPS PM3352A can produce hard copies of the screen information. The setup depends on the version of your oscilloscope and the interface used.

General Setup:

1. Ensure the oscilloscope and printer/plotter are interconnected with a suitable cable and set up for the correct interface parameters.

2. Enter the Application preselect menu by pressing the front panel MENU key and keeping it pressed, then press AUTO SET. After this, press the APPL softkey.

3. Select plotter or printer parameters in the menu.

For Analog Plot Out to XY Recorders (all versions):

1. In the Application menu, press the PLOT-KEY softkey until “plot analog” appears in the top text area.

2. Press PLOT-A softkey to access the setup menu for PLOTSPEED (20…2000 ms/dot) and PENLIFT (pen on paper at high or low level).

For Digital Plot/Print via IEEE-488 (Version /40):

1. In the Application menu, press the IEEE softkey to enter the IEEE setup menu. Select the IEEE address and mode (TALKER/LISTENER, etc.).

2. Select “plot-digital” or “printer” using the PLOT-KEY softkey.

3. Press PLOT-D to set up plotter type and format, or press PRINTER to set up printer type.

For Digital Plot/Print via RS-232C (Version /50):

1. In the Application menu, press the RS232 softkey to enter the RS-232C setup menu. Set BAUD RATE, PARITY, STOP BIT, and DATA BIT.

2. Select “plot-digital” or “printer” using the PLOT-KEY softkey.

3. Press PLOT-D to set up plotter type and format, or press PRINTER to set up printer type.

Plotting is started by pressing the front panel PLOT key. During the plot action, the signal acquisition stops and all softkeys are inactive.

For correct and safe use of the PHILIPS PM3352A, it is essential to follow safety precautions:

– The instrument is designed to be used by properly-trained personnel only. Adjustment, maintenance, and repair of exposed equipment should only be carried out by qualified personnel.

– 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 protective action must not be negated by using 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.

– The instrument should be disconnected from all voltage sources when renewing a fuse. WARNING: Make sure that only fuses of the required current and voltage rating are used. The use of repaired fuses and/or short-circuiting of the fuseholder is prohibited.

– If the instrument is brought from a cold into a warm environment, condensation may cause a hazardous condition. Ensure that the earthing (grounding) requirements are strictly adhered to.

– If safety-protection has been impaired (e.g., the instrument fails to perform measurements or shows visible damage), the instrument must be made inoperative and secured against any unintended operation. The matter should then be referred to qualified technicians.

The PHILIPS PM3352A is provided with a built-in memory back-up circuit, but the batteries (2*LR6 Alkaline Penlight) are not factory installed and must be fitted at delivery. Replacement should be carried out 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.

To adjust the handle of the PHILIPS PM3352A, pull both handle ends outwards away from the instrument. The handle can then be rotated to allow for 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.

The table below shows the relationship between the time base setting and the digital acquisition mode, sampling rate, and resolution for the PHILIPS PM3352A series oscilloscopes.