TB 9-6625-2168-24
NOTE
TI FREQUENCY meter may peg upscale until the operating
voltage of the frequency transducer, L101 (105 to 135 V ac) is
reached.
(3) Adjust calibrator frequency to 400 Hz and voltage output until AC VOLTS
meter indicates 125 V. Calibrator will indicate between 122 and 128 V.
(4) Repeat technique of (3) above for AC VOLTS meter indications listed in table 5.
Calibrator will indicate within limits specified.
Table 5. AC VOLTS Meter Check
Test instrument
Calibrator indications
AC VOLTS meter
(V ac)
indications
(V ac)
Min
Max
120
117
123
90
87
93
60
57
63
30
27
33
(5) Adjust calibrator for 115 V indication on AC VOLTS meter.
(6) Adjust calibrator frequency until FREQUENCY meter indicates 400 Hz.
Calibrator will indicate between 399 and 401 Hz. If not, perform b below.
(7) Adjust calibrator frequency until FREQUENCY meter indicates 390 Hz.
Calibrator will indicate between 388 and 392 Hz.
(8) Adjust calibrator frequency until FREQUENCY meter indicates 410 Hz.
Calibrator will indicate between 408 and 412 Hz.
b. Adjustments
(1) Adjust calibrator frequency to 400 Hz.
(2) Adjust FREQUENCY ADJUST L101 (fig. 4) until FREQUENCY meter
indicates 400 Hz (R).
Figure 4. Motor-generator test set - rear view.
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