TB 9-6625-1098-24
(4) Adjust FREQUENCY dial for a null indication on TI meter. (Set METER
RANGE switch as necessary for sharp null.)
(5) Slip FREQUENCY dial on shaft (remove knob for access to dial locking screws)
until dial indication of 5 is aligned with marker (R).
(6) Set METER RANGE switch to .3 VOLTS and FUNCTION switch to
SET LEVEL.
(7) Adjust calibrator frequency for 60 kHz and amplitude for an indication of 3 on TI
meter 0 to 3 scale.
(9) Set FUNCTION switch to DISTORTION.
(10) Fine tune FREQUENCY dial for a null indication on TI meter.
Record
frequency dial setting.
NOTE
Because of interaction when removing protective cover, repeat
technique of (10) above and compare frequency dial settings.
(12) Adjust C3 (fig. 1) for a null indication on TI meter (R).
15. Second Harmonic Rejection
a. Performance Check
(1) Connect calibrator OUTPUT to TI INPUT.
(2) Position TI controls as listed in (a) through (e) below:
FUNCTION switch to SET LEVEL.
(a)
METER RANGE switch to SET LEVEL.
(b)
FREQUENCY RANGE switch to X10K.
(c)
(d)
SENSITIVITY switch to MAX.
(e)
(3) Adjust calibrator frequency to 500 kHz and amplitude for 0 dB on TI meter.
(4) Set FUNCTION switch to DISTORTION.
(5) Adjust FREQUENCY dial and BALANCE controls for null indication on TI
meter. (Set METER RANGE switch as necessary for sharp null.)
(6) Set METER RANGE switch to 0 dB and FUNCTION switch to SET LEVEL.
(7) Adjust calibrator frequency to second harmonic of calibrator frequency used in
(3) above. Adjust calibrator amplitude controls for 0 dB on TI meter.
(8) Set FUNCTION switch to DISTORTION. TI meter will indicate between
-3 and 0 on dB scale.
(9) Repeat (2) through (8) above, using frequencies, control settings, and indications