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VOLTAGE WAVEFORMS IN THE INSTRUMENT
9.
INTRODUCTION
9.1.
The waveforms given in this chapter are typical values and represent an average instrument.
So the waveforms measured in your "oscilloscope under
this manual. The waveforms are listed in 3 chapters:
9.2. Vertical deflection and triggering
9.3. Hprizontal deflection
9.4. Power supply
The measurement can be started a t every desired point because settings o f "measuring oscilloscope" and
"oscilloscope under
The t e s t points are marked on the units.
The required t e s t equipment consists o f an oscilloscope of 100 MHz (e.g. Philips PM 3262) with a suitable
attenuator probe.
The input square wave signal for the "oscilloscope under t e s t " can be obtained from a function generator
Standard-settings for the "oscilloscope under test"
Depress the Y-position controls t o the non-inverted position (S4 and
-
- Push the channel A and B signal coupling switches in the AC position 6 1 7 and S18).
- Depress pushbutton A (or B) of the vertical display mode selector S1.
- Set the channel A and B AMPL/DIV controls i n the 1 V/div. position and their verniers t o CAL.
- Depress pushbutton MTB of the horizontal display mode selector 6 2 ) .
- Depress the time base magnifier X MAGN
- Depress pushbutton AUTO PP of trigger mode selector
- Set the MTB in the 0.1 ms/div. position and i t s vernier t o CAL.
- Set the DTB TIME/DIV switch in the OFF position and i t s vernier t o CAL.
Depress pushbutton DC of the MTB and DTB trigger coupling controls (S20 and S19).
-
Depress pushbutton A (or B ) of the MTB trigger source selector 6 2 3 ) .
-
Depress pushbutton MTB of the D T 8 trigger source selector (S22).
-
- Apply a square-wave signal on
- Set the signal in the middle of the screen by means of the channel A (or B) position controls (R1 and R2).
- Set the HOLD OFF control in the CAL position.
Adjust the DELAY TIME control t o 5,OO.
-
Standard-settings o f the "measuring oscilloscope"
- The waveforms are measured on channel A, the required AMPL/DIV position is indicated beside every
waveform.
The vertical position of the main time base line without input signal i s indicated beside every waveform
-
with a "0".
- The instrument is triggered on channel A.
- Only the MTB is used and the required TIME/DIV position is indicated beside every waveform.
- The MTB trigger coupling control occupies the DC position.
The units on which voltage waveforms can be measured are:
Unit 2: Time base unit
Unit 3: Preamplifier and trigger unit; for measurements on t e s t points M23
selection unit must be lifted.
Unit 4: Trigger selection unit, the t e s t point on this unit (M27) i s not indicated. For the location o f M27 refer
t o the p.c.b. lay-out of the unit.
Unit 6: Power supply.
that differ from the "standard" settings are indicated beside the waveforms.
test"
6
test" can differ somewhat from the values given in
...
M29, the trigger source
9- 1
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