TB 9-6625-152-24
(7) Repeat technique of (2) and (3) above for TI frequencies and levels listed in
perform b below.
Table 18. Audio Generator 2 Distortion.
Test instrument
Measuring receiver
Output
Indication limits
(%)
Frequency (kHz)
Level (V)
1
4
<0.5
1
0.5
<0.5
1
2
4
<1.0
5
4
<1.0
15
4
<1.0
Set measuring receiver low pass filter to 30 kHz.
1
(8) Press AF TEST, [Audio Gen], [Gen1/Gen2] until AF2 FREQ is highlighted,
then press ON OFF key to off.
(9) Disconnect equipment setup.
b. Adjustments. Perform adjustments in Section IV below.
18. Audio Frequency Meter
a. Performance Check
(1) Connect equipment as shown in figure 1 below.
(2) Set TI as listed in (a) through (c) below:
(a) Press AF TEST.
(b) Press AF TEST, [AF Filter], [50 kHz LP].
(c) Press AF TEST, [Scope/Bar], [Scope/Bar] followed by
,
keys to
100 mV/Div range.
(3) Set multimeter for AC voltage measurement in AUTO range.
(4) Set function generator for a 20 Hz, 40 mVrms, sine wave output.
(5) Adjust function generator output amplitude for a multimeter indication as close
as possible to 50 mV. If TI AUDIO FREQUENCY indication is not within limits specified
in first row of table 19, perform b below.
(6) Repeat technique of (4) and (5) above for TI frequencies listed in table 19. If TI
b below.