TB 9-6625-2343-50
(24) Set calibrator for a wideband output frequency of 10 kHz at a level of 179.4 mV.
(25) Adjust calibrator level for a TI indication of 25 kHz.
(26) Press TI MEASUREMENT ΦM key.
(27) If TI indication is not within limits specified in the first row of table 10, perform
b below.
(28) Repeat technique of (23)(c) and (24) through (26) above for remaining calibrator
initial settings and TI FM deviations in table 10. If TI indications are not within limits
specified in table 10, perform b below.
Test instrument
Φ Modulation indications
Calibrator
FM deviation
initial output
indication
(rad)
Frequency
Level (mV)
(kHz)
Max
Max
10 kHz
179.4
25
2.39
2.61
10 kHz
18
2.5
0.239
0.261
1 kHz
178.5
25
24.0
26.0
200 Hz
84
5
24.0
26.0
(29) Move TI sensor module from AM/FM test source FM/4 OUTPUT to FM OUTPUT.
(30) Press TI keys as listed in (a) through (e) below:
(a)
AUTOMATIC OPERATION.
MEASUREMENT ΦM.
(b)
(c)
DETECTOR PEAK+.
(d)
HP FILTER 300 Hz.
(e)
LP FILTER 15 kHz.
(31) Set audio analyzer for an output of 1 kHz source frequency, 1 mV level step, 600 Ω
output impedance, 4.38 V output level, and activate HP filter.
(32) Disconnect calibrator from AM/FM test source.
(33) Connect audio analyzer OUTPUT HIGH to AM/FM test source AUDIO INPUT.
(34) Adjust audio analyzer source level for a TI indication of 400 rad.
(35) Enable audio analyzer special function 15, and then activate distortion function.
(36) If audio analyzer indication is not ≤ 0.1%, perform b below.
(37) Set audio analyzer for an output level of 440 mV and 1 mV level steps.
(38) Adjust audio analyzer source level for a TI indication of 40 rad.
(39) Press TI keys as listed in (a) through (c) below:
(a) DATA 3.1.
(b) DATA SPCL.
(c) MEASUREMENT ΦM.
(40) Enable audio analyzer special function 15, and then activate distortion function.
(41) If audio analyzer indication is not ≤ 0.1%, perform b below.
(42) Reduce all outputs to minimum and disconnect equipment setup.
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