TB 9-6625-2343-40
(37) Repeat step (35) above for remaining calibrator frequencies listed in table 7. If
TI indications are not within limits specified, perform b below.
Table 7. 1.5 MHz IF Accuracy
Test instrument
Calibrator
indications
frequency
(kHz)
output
Min
Max
50 kHz
98.9
101.1
100 kHz
94.9
105.1
50 Hz
98.9
101.1
20 Hz
94.9
105.1
(38) Press TI keys as listed in (a) and (b) below:
(a) HP FILTER 50 Hz.
(b) LP FILTER 3 kHz.
(39) Set calibrator output frequency to 1 kHz and output amplitude to 250 mV.
(40) Adjust calibrator amplitude for a TI indication of 50 kHz peak deviation.
(41) Press TI MEASUREMENT AM key.
(42) Disconnect calibrator from AM/FM test source AUDIO INPUT.
(43) Record the indication displayed on TI as residual AM1.
(44) Reconnect calibrator to AM/FM test source AUDIO INPUT.
(45) Subtract one-half of the residual AM1 indication recorded in (43) above from TI
displayed indication. If result is not ≤ 0.2%, perform b below.
(46) Move TI sensor module from AM/FM test source FM/4 to FM/32 connector.
(47) Press TI keys as listed in (a) through (c) below:
(a) DATA 3.1.
(b) DATA SPCL.
(c) MEASUREMENT FM.
(48) Set calibrator output frequency to 1 kHz and output amplitude to 200 mV.
(49) Adjust calibrator amplitude for a TI indication of 5 kHz peak deviation.
(50) Press TI MEASUREMENT AM key.
(51) Disconnect calibrator from AM/FM test source AUDIO INPUT.
(52) Record the indication displayed on TI as residual AM2.
(53) Reconnect calibrator to AM/FM test source AUDIO INPUT.
(54) Subtract one-half of the residual AM2 indication recorded in (52) above from TI
displayed indication. If result is not ≤ 0.2%, perform b below.
(55) Press TI keys as listed in (a) through (c) below:
(a) MEASUREMENT FM.
(b) HP FILTER (all off).
(c) LP FILTER >20 kHz.
(56) Set calibrator output frequency to 1 kHz at an output amplitude of 400 mV.
18