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L. CROSS-TALK
— Set V/cm SK3 (SK7, SK11, SK15) to .01.
— Apply a sinusoidal voltage with speak-to-peak value
of 180 mV, frequency 10 MHz, to channel A.
— Check that the deflection of channels B, C and D
does not exceed 2 mm.
— Repeat this check for the other channels.
— Set V/cm (SK3) to position 10 V/cm (SK7, SK11,
SK15 remains in positons .O1).
— Apply a sinusoidal voltage, having speak-to-peak
value of 100 V, frequency 1 MHz to channel A.
— Check that the deflection of channels B, C and D
does not exceed 1 mm.
— Repeat this check for the other channels.
M. TRIGGERING
— Apply a signal, having a frequency of 10 MHz, to
channel A (B, C, D).
— Check that with a signal height of 3 mm, applied to
channel A (B, C, D) and TRIGG. (SK18) to
position A (B, C, D) a triggered display can be ob-
tained.
Set switch INV.-OFF-NORM, SK4 (SK8, SK12,
SK16) from position NORM to position INV.
The polarity of the displayed signal should invert.
Repeat this check with a signal having a frequency
of 50 MHz and a trace height of 15 mm.
N. CHOPPED
1. Frequency
C717 (Fig. 7)
— Set switch CHOPPED-ALTERNATE (SK 18) to
position CHOPPED.
— Set TIME/cm (SK4) of the basic oscilloscope to
position .2 µsec.
— All time base lines should be periodically interrupted
in the frequency of the switching voltage.
— Check the frequency by measuring the period time.
For this, the basic oscilloscope should be externally
Fig. 8. Pulser TLIS
triggered by the switching pulses. Apply this signal to
EXT. (BU1) of the basic oscilloscope and set
TRIGG. SOURCE to EXT.
— The period time should be between 500 and 600 ns.
If necessary, select an other value for C717.
2. Blanking
— Trigger the basic oscilloscope PM 3330 externally with
the switching voltage as indicated in point N 1.
— Without blanking (SK14 of the basic oscilloscope to
EXT.) the edges of the switching pulses are visible.
When SK14 is set to position MULTI-TRACE CHOPPER
the edges should not be visible.
3. Amplitude
R747 (Fig. 7)
— Check the voltage between point "A" (R141-GR107)
and point "B" (emitter TS501) Fig. 6.
It should be between 2.2 and 2.6 V.
— If necessary change R747 (Fig. 7).
O. ALTERNATE
— Adjust the basic oscilloscope so as to obtain a free
running time base.
— Set CHOPPED-ALTERNATE (SK18) to position
ALTERNATE.
— Check that in all positions of TIME/cm (SK4) of the
basic oscilloscope, four time-base lines are written in
the sequence A, B, C, D.
If the four-trace unit is to be used in conjunction with
a PM 3330 basic oscilloscope and a PM 3347 as a
time delay unit, the following check must be carried
out.
— Insert a PM 3347 into compartment X-UNIT of basic
oscilloscope PM 3330.
— Set X-DEFLECTION (SK7) of the basic oscilloscope to
position X-UNIT.
— Set the X-deflection mode selector (SK7) of the PM 3347 to
position "B intensified by A".
Check that in all positions of TIME/cm (SK4) of the basic
oscilloscope, four time-base lines are written in the sequence
A, B, C, D.
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TO BE ADDED
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