TB 9-6625-2343-40
(20) Repeat technique of (14), (17) and (19) above for remaining frequency and AM
percent settings in table 3. The audio analyzer will indicate within the limits specified in
Audio analyzer
Calibrator
Test instrument
Frequency
AM indication (%)
Indicated limit (%)
≤ 0.3
20 kHz
50
≤ 0.6
20 kHz
95
≤ 0.6
50 Hz
95
≤ 0.3
50 Hz
50
(21) Set calibrator for a wideband output of 1 kHz at an amplitude of 383 mV.
(22) Adjust calibrator output amplitude for a TI indication of 80 percent AM.
(23) Press calibrator NEW REF key.
(24) Press TI keys as listed in (a) through (c) below:
(a) DETECTOR AVG.
(b) DISPLAY RATIO.
(c) DISPLAY LOG/LIN.
(25) Change calibrator output frequency to 10 kHz.
(26) TI will indicate within limits specified in second row of table 4. If not, perform b below.
(27) Repeat technique of (25) above for remaining calibrator frequencies listed in
table 4. If TI indications are not within limits specified, perform b below.
Calibrator
Test instrument
Frequency
Indication (%)
output
Min
Max
1 kHz
Ref.
Ref.
10 kHz
99.6
100.4
150 Hz
99.6
100.4
90 Hz
99.6
100.4
(28) Press TI keys as listed in (a) through (c) below:
(a) DISPLAY RATIO.
(b) DETECTOR PEAK+.
(c) DATA 5.1, SPCL.
(29) Set calibrator for a wideband output of 10 kHz at an amplitude of 383 mV.
(30) Adjust calibrator output amplitude for a TI indication of 80 percent multiplied
by the reading recorded in step (6) above.
Example: 80 percent AM X 1.004 = 80.32 percent AM
(31) Press calibrator NEW REF key.
(32) Press TI 80, RATIO keys.
(33) Change calibrator output frequency to 50 kHz.
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