TB 9-6625-1213-24
c. Unless otherwise specified, verify the result of each test and, whenever the test
requirement is not met, take corrective action before continuing with the calibration.
Adjustments required to calibrate the TI are included in this procedure.
d. Unless otherwise specified, all control and control settings refer to the TI.
WARNING
HIGH VOLTAGE is used or exposed during the performance of
DEATH ON CONTACT may result if
personnel fail to observe safety precautions.
REDUCE
OUPUT(S) to minimum after each step within the performance
check where applicable.
WARNING
Selenium rectifiers are contained in this TI. When selenium
rectifiers burn out, poisonous fumes are released. Do not
inhale fumes or handle rectifiers until they have cooled.
NOTE
When indications specified in paragraphs 16 and 17 are not
within tolerance perform the power supply check prior to
making adjustments. After adjustments are made, repeat
paragraphs 16 and 17. Do not perform power supply check if
all other parameters are within tolerance.
a. Remove protective cover from TI only to make adjustments and replace immediately
upon completion.
b. Connect TI to autotransformer.
c. Connect autotransformer to a 115 V ac source and adjust for 115 V.
d. Set GAIN switch to 20 dB and LINE switch to ON and allow 15 minutes for warm-up.
16. Gain, Stability, and Frequency Response
a. Performance Check
(1) Connect function/arbitrary generator and multimeter to TI INPUT.
indication on multimeter.
(3) Connect multimeter to TI OUTPUT. Multimeter will indicate between 9.9 and 10.1 V ac.
(4) Vary autotransformer from 105 to 125 V ac and back to 115 V while observing
multimeter. Multimeter will indicate within limits of (3) above.
(5) Adjust function/arbitrary generator amplitude for a 1 V indication on multimeter.
(6) Set GAIN switch to 40 dB. Multimeter will indicate between 9.9 and 10.1 V ac.
a 9-V indication on multimeter. Record multimeter indication.