TM 11-6625-3053-14
STEP
OPERATION
NORMAL INDICATION
CORRECTIVE ACTION
9
EXTERNAL PULSE 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.
Connect the output of the pulse generator to the vertical input of the oscilloscope through a video
cable.
Set vert sensitivity on scope to the 5V/cm scale.
Set pulse generator rep rate at 50 pps and amplitude to the 20 volt range.
Set pulse generator and scope ON.
Synchronize hor sweep on scope and adjust pulse generator amplitude to show a vertical display of 4
cm or boxes representing a pulse amplitude of 20V. Adjust pulse width for a hor display of 4 cm or
boxes on the 1 usec/cm scale. Leave pulse generator settings and disconnect video cable from
scope.
De-energize pulse generator and scope.
Connect test set up as shown below:
Set signal generator initial settings of para 2-4, and the FREQUENCY to 1600 MHz.
Energize scope for normal operation. Energize pulse generator, and sig gen if off.
Set MODULATION switch to EXTERNAL PULSE if sig gen was on, or wait 2 mins before doing so if
just energized.
Set scope vert sensitivity to the .01 volts/cm scale and adj. hor sweep to display one pulse on 1
usec/cm sweep scale. Adjust signal generator ATTENUATOR control to display pulse 5 boxes
vertically on scope.
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