TB 11-6625-247-35
(4) Adjust audio oscillator (A1) to 400 Hz and output amplitude for an indication of
150 (full scale) on Test Instrument VOLTS AC-DC meter.
(5) Indication of the electronic voltmeter (A2) shall be within the limits specified in
table 3, columns 2 and 3.
Table 3. Milliammeter Check
Test instrument
Electronic voltmeter indication (volts ac)
VOLTS AC-DC meter indication
Minimum
Maximum
150
147
153
100
97
103
50
47
53
(6) Repeat the procedure given in (4) and (5) above for the Test Instrument test
meter indications of 100 and 50 as specified in table 3.
(7) Reduce the audio oscillator output amplitude to zero. Remove decade resistor
(A4) from the setup. Disconnect the test leads from the meter, and connect the lead sets
designed A and B in figure 2 to pins A and B, respectively, of P-1 on the front panel of the
Test Instrument.
(8) Position Test Instrument switch S1 to POWER CHECK, and switch S5 to AB.
(9) Repeat the procedure (table 3, line 1 only) given in (4), and (5) above.
Requirements shall be as indicated in table 3.
(10) Reduce the audio oscillator output to zero. Disconnect the lead sets designated
A from connector P-1 and reconnect to pin C of the connector. Position Test Instrument
switch S5 to BC.
(11) Repeat the procedure (table 3, line 1 only) given in (4), and (5) above.
Requirements shall be as indicated in table 3.
(12) Turn the audio oscillator power ON-OFF switch to OFF. Remove the audio
oscillator from the test setup and insert power supply (A5). Use adapters (B3) where
required.
(13) Position Test Instrument switch S5 to 28 VDC Connect lead set A and B to
connector P-1 pins A and D, respectively.
(14) Turn the power supply power switch to ON and adjust the output voltage for an
indication of 30 on the Test Instrument VOLTS AC-DC meter.
(15) Indication on the electronic voltmeter shall be between 27 and 33 volts dc.
b. Adjustments. No adjustments can be made.
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