TB 9-6625-2278-24
(20) Repeat (18) and (19) above until both indications are within the limits specified.
(21) Press TI and range calibrator LINE switches to OFF position.
(22) Disconnect range from TI calibrator.
(23) Press TI LINE switch to ON position.
10. Power Reference Oscillator Frequency Accuracy Test
a. Performance Check
(1) Press POWER REF OSC switch to off position (LED off).
(2) Connect POWER REF to INPUT 2 of microwave frequency counter.
(3) Press POWER REF OSC switch to on position (LED on). If microwave
frequency counter indication is not between 49.5 and 50.5 MHz, perform b below.
b. Adjustments
(1) Press TI LINE switch to OFF.
(2) Remove TI top cover and loosen screws holding the A3 CPU assembly. Swing
out assembly.
NOTE
Screwdriver adjustment is accessible through a hole in the
deck.
(3) Press TI LINE switch to ON position.
(4) Adjust G1A1L1 for a microwave frequency counter indication between 49.5 and
50.5 MHz (R).
(5) Press TI LINE switch to OFF position.
(6) Swing in assembly and tighten screws holding the A3 CPU assembly. Replace
TI top cover.
(7) Press TI LINE switch to ON position.
11. Power Reference Level
a. Performance Check
(1) Set power meter power pushbutton to OFF position.
(2) Disconnect thermistor mount from power meter interconnect cable.
(rear panel) and pin 1 of thermistor mount end of power meter interconnect cable.
(4) Round off multimeter indication to two decimal places and record this value as
power meter internal bridge resistance R (value will be approximately 200 ).
(5) Connect thermistor mount to power meter interconnect cable.