TB 9-4931-488-35
Audio analyzer
Measuring receiver
output
indications
levels
(% AM)
(V ac)
Min
Max
0.827
85.5
94.5
0.643
66.5
73.5
0.459
47.5
52.5
0.276
28.5
31.5
0.184
19.0
21.0
0.092
9.5
10.5
(7) Adjust audio analyzer OUTPUT controls for a 1.000 V level.
(8) Adjust AM control for 90% modulation (9 on 0-10 scale) as indicated on TI meter.
The measuring receiver will indicate between min and max limits listed in table 23.
(9) Repeat technique of (8) above for TI meter indications listed in table 23. The
measuring receiver will indicate as specified.
Measuring receiver
Test
indications
instrument
(% AM)
meter
indications
Min
Max
90
83.6
96.5
70
64.7
75.4
50
45.8
54.3
30
26.9
33.2
20
17.4
22.6
10
7.95
12.1
(10) Press LEVEL VOLTS pushbutton. Set OUTPUT LEVEL 10 dB switch to +10
dBm and 1 dB switch to -7 dB. Adjust OUTPUT LEVEL vernier control for a -7dB
indication on TI meter.
(11) Adjust AM control for a 50% AM indication on measuring receiver. The
distortion, as indicated on the audio analyzer will be within limits listed in table 24.
(12) Repeat technique of (10) and (11) above for TI meter dB indications and
measuring receiver % AM indications listed in table 24. The audio analyzer indications will
be as specified.
Test instrument
Measuring receiver
Audio
meter indications
indications
analyzer
(dB)
(% AM)
indications
(<%)
-7
50
1
-7
90
3
32
