TB 9-6625-2343-40
NOTE
Nothing should be connected to the AUDIO INPUT of the test
source.
(9) Press TI keys as listed in (a) and (b) below:
(a) MEASUREMENT FREQ.
(b) TRACK MODE.
(10) Adjust AM/FM test source CARRIER FREQUENCY TUNE control for a TI
indication of approximately 12.5 MHz.
(11) Press TI keys as listed in (a) through (f) below:
(a)
TRACK MODE.
(b)
MEASUREMENT AM.
(c)
DATA 2.0, SPCL.
(d)
HP FILTER 50 Hz.
(e)
DETECTOR AVG.
(f)
LP FILTER 3 kHz.
(12) If TI indication is not ≤ 0.01%, perform b below.
(13) Connect equipment as shown in figure 1.
Figure 1. AM distortion.
(14) Set calibrator for a wideband output of 20 kHz at an amplitude of 215 mV.
(15) Turn all TI HP FILTERS and LP FILTERS off.
(16) Press TI keys as listed in (a) and (b) below:
(a) DETECTOR PEAK+.
(b) MEASUREMENT AM.
(17) Adjust calibrator wideband output for a TI indication of 50 percent AM.
(18) Set the audio analyzer to measure distortion with 80 kHz low-pass filtering.
(19) The audio analyzer will indicate within the limits specified in the first row of
table 3, if not perform b below.
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