TB 9-6625-003-35
(8) Adjust TI GAIN control for some indication on TI meter as recorded in (7) above.
(9) Set test oscillator attenuator output to 0 DBM and RANGE DB switches on TI
and SWR meter to 10 DB.
(10) Adjust test oscillator amplitude for same SWR meter indication recorded in (7)
above. TI will indicate within +0.1 dB of SWR meter indication.
(11) Set test oscillator attenuator output to 10 DBM and RANGE DB switches on TI
and SWR meter to 20 DB.
(12) Adjust test oscillator amplitude for same SWR meter indication as recorded in
(7) above. TI will indicate within 0.1 dB of SWR meter indication.
(13) Repeat technique above, using test oscillator attenuator and attenuator (A2) to
compare each 10 dB step of TI RANGE switch with corresponding step of SWR meter.
(14) Set SWR meter, TI RANGE switch, and attenuator (A2) 0 dB.
(15) Set SWR meter EXPAND switch to 0 (zero) and TI METER SCALE switch to
EXPAND.
(16) Adjust SWR meter GAIN control fully counterclockwise.
(17) Adjust test oscillator amplitude for a 0-dB indication on TI meter.
(18) Adjust SWR meter for a 0-dB indication on SWR meter, using GAIN control.
(19) Set attenuator (A1) to 4 dB. If TI meter does not indicate within 0.1 dB of
SWR meter indication, perform b below.
b. Adjustments. Adjust
R33 (R53 for model 351) (fig. 5) for same TI
indication as
SWR meter (R).
NOTE
Do not perform power supply check if all other parameters are
within tolerance.
a. Performance Check. Connect dc
voltmeter (A4) between pin 3 of V5
(+245 V)
(fig.
5) and
chassis ground, using probe (B6). If dc
voltmeter does not
indicate between +242.55
and +247.45 V, perform b below.
b. Adjustments.
Adjust R45 (fig. 5) until dc
voltmeter indicates 245 V dc
(R).
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