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Audio Generator Output Level
Table 17. Audio Generator 1 Distortion

Calibration Procedure For Radio Test Set, Models 2947 And 2947A And Model 2947 Page Navigation
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TB 9-6625-152-24
Table 15. Audio Generator 1 Output Level.
Test instrument
Multimeter
Output
Indication limits (V)
Frequency (Hz)
Level (V)
Min
Max
50
1
0.949
1.051
500
1
0.949
1.051
5k
1
0.949
1.051
10 k
1
0.949
1.051
15 k
1
0.949
1.051
15 k
2
1.899
2.101
50
2
1.899
2.101
50
4
3.799
4.201
15 k
4
3.799
4.201
15 k
20 m
18.9  m
21.1
m
50
20 m
18.9  m
21.1
m
50
400 m
379.9  m
420.1
m
15 k
400 m
379.9  m
420.1
m
(6) Press AF TEST, [Audio Gen], [Gen1/Gen2] until AF1 FREQ is highlighted,
then press ON OFF key to off.
(7) Press AF TEST, [Audio Gen], [Gen1/Gen2] until AF2 FREQ is highlighted,
then press ON OFF key to on. If multimeter indications are not within limits specified in
first row of table 16, perform b below.
(8) Repeat technique of (3) (c) and (e) for remaining TI frequencies and output levels
in table 16. If multimeter indications are not within limits specified in table 16, perform b
below.
Table 16. Audio Generator 2 Output Level.
Test instrument
Multimeter
Output
Indication limits (V)
Frequency (Hz)
Level (V)
Min
Max
50
1
0.949
1.051
500
1
0.949
1.051
5k
1
0.949
1.051
10 k
1
0.949
1.051
15 k
1
0.949
1.051
15 k
2
1.899
2.101
50
2
1.899
2.101
50
4
3.799
4.201
15 k
4
3.799
4.201
15 k
20 m
18.9  m
21.1
m
50
20 m
18.9  m
21.1
m
50
400 m
379.9  m
420.1
m
15 k
400 m
379.9  m
420.1
m
(9) Press AF TEST, [Audio Gen], [Gen1/Gen2] until AF2 FREQ is highlighted,
then press ON OFF key to off and disconnect equipment setup.
b. Adjustments. Perform adjustments in Section IV below.
22


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