TB 9-4931-495-24
c. Connect mainframe to autotransformer.
d. Connect autotransformer to 115 V ac source and adjust autotransformer for 115 V output.
e. Energize equipment and allow at least 30 minutes for equipment to reach
operating temperature.
CALIBRATION PROCESS FOR SWEEP OSCILLATOR MODELS 8620A AND C
NOTE
When indications specified in paragraphs 8 through 16 are not
within tolerance, perform the power supply check prior to
making adjustments. After adjustments are made, repeat
paragraphs 8 through 16. Do not perform power supply check if
all other parameters are within tolerance.
8. Amplitude Modulation
a. Performance Check
(1) Set POWER LEVEL control fully ccw.
(2) Connect RF OUTPUT to microwave frequency counter, using attenuator (fixed)
and crystal detector.
NOTE
Attenuator (fixed) not required when using model 86290A plug-
in.
(3) Set 1 kHz SW WV/OFF (AM-MOD) switch (rear panel) to 1 kHz SQ WV
(1 kHz).
(4) Press CW pushbutton and set RF switch to ON.
(5) Adjust POWER LEVEL control cw to drive microwave frequency counter. If
microwave frequency counter does not indicate between 0.95 and 1.05 kHz, perform
b below.
indication on microwave frequency counter (R).
