TM 11-6625-3053-14
STEP
OPERATION
NORMAL INDICATION
CORRECTIVE ACTION
Measure rise time and fall time of the pulse. Ignore the first and last 5% of vertical amplitude.
Rise time is less than 2 usecs.
Fall time is less than 3.5 usecs.
Redo entire test with the pulse generator output now at 50 K pps, all other factors remaining
unchanged. Vary the signal generator ATTENUATOR control to obtain a modulated pulse 5 cm high
on the scope.
Rise time is less than 2 usecs.
Fall time is less than 3.5 usecs.
Troubleshooting item 16.
10
EXT AM MODULATION CHECK
If you are continuing from previous step, set MODULATION switch to RF OFF. If you are performing
this as a separate test, start with sig gen POWER off.
Set POWER on test oscillator and scope.
Connect the output of the test oscillator to the vert input of the scope. Set scope to 2V/cm vertical
sensitivity, and test oscillator to an output of 1 KHz.
Adjust hor sweep on scope to display 5 or 6 cycles.
Adjust test oscillator amplitude to display 5 cm p-p vertically, or 10 volts. Leave test oscillator
settings.
De-energize test oscillator and scope.
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