TB 9-4931-321-24
(6) Adjust A3R29 (R329 or R29) (fig. 1) to obtain indication of 1 dB on TI meter 0
(zero) to 2 dB scale (R).
(7) Turn BANDWIDTH control fully clockwise and repeat (2) through (6) above
until TI meter indication remains between 0.5 and 1.5 dB throughout range of
BANDWIDTH control.
12. Range Accuracy
a. Performance Check
(1) Set EXPAND switch to NORM and BANDWIDTH control fully clockwise.
(2) Connect function generator output to ratio transformer input using
termination and connect ratio transformer output to TI INPUT.
50
NOTE
Isolate TI from power line ground for remainder of procedure
utilizing isolation plug.
(3) Adjust ratio transformer to 1.000000 and adjust function generator output
amplitude to obtain on-scale indication on TI meter.
(4) Adjust function generator frequency to obtain peak indication on TI meter.
Adjust function generator output to 1 V rms.
(5) Adjust GAIN controls to obtain a 0 (zero) dB indication on TI meter. Readjust
function generator output amplitude if necessary.
(6) Adjust ratio transformer to 0.100000 and set RANGE-DB switch to 10.
(7) Adjust ratio transformer to obtain a 0 (zero) dB indication on TI meter. Ratio
transformer will indicate between 0.098850 and 0.101160.
(8) Reduce function generator output amplitude and adjust ratio transformer to
1.000000.
(9) Adjust function generator output amplitude to obtain a 0 (zero) dB indication on
TI meter.
(10) Adjust ratio transformer to 0.100000 and set RANGE-DB switch to 20.
(11) Adjust ratio transformer to obtain a 0 (zero) dB indication on TI meter. Ratio
transformer will indicate between 0.098850 and 0.101160.
(12) Repeat technique of (8) through (11) above for remaining RANGE-DB
switch positions.
NOTE
Before performing (8) above for 50 dB switch position, rotate
GAIN control counterclockwise. Return GAIN control to
clockwise position when checks are complete.
b. Adjustments. No adjustments can be made.
