TB 9-6625-1356-24
Table 7. Distortion Check
Test instrument
FREQUENCY RANGE switch settings
FREQUENCY dial settings
X10
5
X10
10
X100
1
X100
10
X1K
10
X10K
1
X10K
2
X100K
1
b. Adjustments. Adjust A2R17 (fig. 1) for minimum distortion indication on audio
analyzer (R).
13. Output Attenuator Accuracy
a. Performance Check
(1) Adjust AMPLITUDE controls for minimum output.
(2) Connect equipment as shown in figure 3.
RMS 3.173 V AC
Figure 3. Output attenuator - equipment setup.
(3) Position controls as listed in (a) through (c) below:
(a) FREQUENCY RANGE switch to X1M.
(b) FREQUENCY dial to 10.
(c) OUTPUT ATTENUATOR switch to +20 DBM.
(4) Adjust attenuator to 60 dB.
(5) Adjust AMPLITUDE controls for a 1 mV reference indication on true rms
voltmeter. Record exact indication.
(6) Set OUTPUT ATTENUATOR switch to +10 DBM.
Change 1