TB 9-4931-443-24
(3) Turn EXCITER UNIT FREQUENCY Hz controls to 100 X10.
(4) Repeat a (2) through (4) above.
9. Distortion
a. Performance Check
(1) Connect EXCITER UNIT jack J101 to POWER UNIT jack J201 (rear panel).
(2) Connect audio analyzer to POWER UNIT 160V and common jacks.
(3) Turn EXCITER UNIT FREQUENCY HZ controls to 050 X1.
(4) Set POWER UNIT ON/RESET STANDBY switch to ON/RESET.
(5) Adjust EXCITER UNIT VOLTAGE and ATTENUATOR switches for 100 volt
indication on voltmeter portion of audio analyzer.
(6) Measure distortion at 50 Hz. Distortion will be less than 0.05%. If not, perform
b below.
(7) Repeat technique of (3) through (6), above at FREQUENCY Hz control settings
listed in table 4. Audio analyzer will indicate within limits specified. If not, perform b
below.
Table 4. Distortion (Power Unit)
Test instrument FREQUENCY
Frequency
Distortion as indicated on
Hz setting
(Hz)
Audio analyzer (%)
100 X1
100
0.05
100 X10
1,000
0.05
010 X100
1,000
0.05
020 X100
2,000
0.05
050 X100
5,000
0.05
100 X100
10,000
0.05
200 X100
20,000
1
500 X100
50,000
1
700 X100
70,000
1
900 X100
90,000
1
999 X100 (Cal cw)
100,000
1
b. Adjustments
(1) Adjust P701 (fig. 1) for minimum distortion (R).
(2) Repeat (1) above at FREQUENCY HZ control settings of 200 X100 (20 kHz)
and 200 X10 (2 kHz).
(3) Turn FREQUENCY HZ controls to 100 X100 (10 kHz).
(4) Adjust C714 (fig. 1) for minimum distortion (R).
(5) FREQUENCY HZ controls to 500 X100 (50 kHz).
(6) Adjust C711 (fig. 1) for minimum distortion (R).
