TB 9-4931-495-24
(6) Adjust CW pointer to 1200 MHz and record microwave frequency counter
indication.
(7) Adjust autotransformer from 105 to 125 V ac. Microwave frequency counter will
not vary more than 20 kHz from value recorded in (6) above. Reset to 115 V ac.
(8) Decrease POWER LEVEL control from +13 to +3 dBm. Microwave frequency
counter will not change more than 100 kHz from value recorded in (6) above. Reset
POWER LEVEL to +13 dBm.
(9) Press FULL SWEEP (START) pushbutton and set MANUAL control fully ccw.
If microwave frequency counter does not indicate between 5 and 35 MHz, perform b below.
(10) Adjust MANUAL control fully cw. If microwave frequency counter does not
indicate between 2.385 and 2.415 GHz, perform b below.
b. Adjustments
(1) Connect multimeter between A2TP5 and A4 GND (fig. 3) on model 8620C.
(2) Adjust FREQ CAL control to midrange and CW control for multimeter
indication of 0.00 V dc.
(3) Adjust A2R28 F-LO (fig. 4) for microwave frequency counter indication between
8 and 12 MHz (R).
NOTE
The microwave frequency counter will indicate 10 MHz at two
F LO settings. The correct setting is found by setting F LO
fully cw and then ccw to the first 10 MHz reading.
(4) Adjust CW control until multimeter indicates +10.00 V dc, and adjust A2R12 F-
HI (fig. 4) until microwave frequency counter indicates 2400 MHz (R).
21. Frequency Range (Model 86290A)
a. Performance Check
NOTE
Model 8620A mainframe must be modified to obtain the full
capabilities of the model 86290A plug-in. The unmodified
mainframe will operate cw and slow sweep rates. Refer to
manufacturer's manual for applicable modification kit.
(1) Connect RF OUTPUT to microwave frequency counter using attenuator (fixed).
(2) Position controls as listed in (a) through (j) below:
(a) BAND switch to BAND 1.
(b) MODE switch to MANUAL.
(c) TRIGGER switch to INT.
(d) TIME-SECONDS switch to 0.1-0.01.
(e) TIME-SECONDS vernier control fully cw.
