TB 9-6625-862-24
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 controls and control settings refer to the TI.
7. Equipment Setup
HIGH VOLTAGE is used or exposed during the performance of
this calibration.
DEATH ON CONTACT may result if
personnel fail to observe safety precautions.
REDUCE
OUTPUT(S) to minimum after each step within the
performance checks where applicable.
a. Remove protective cover from TI.
b. Connect TI to autotransformer.
c. Connect autotransformer to a 115 V ac source and adjust for a 115 V ac output.
d. Connect shorting bar between TI lower OUTPUT and ground (GND on some
models) connectors.
e. Position controls as listed in (1) through (7) below:
(1) OUTPUT ATTENUATOR (DB) (OUTPUT DB) 0 to 10 switch to 0.
(2) OUTPUT ATTENUATOR (DB) (OUTPUT DB) 0 to 100 switch to 0.
(3) LOAD switch to OFF.
(4) IMPEDANCE switch to 600.
(5) FREQUENCY RANGE switch to X10.
(6) FREQUENCY dial to 20.
(7) AMPLITUDE (OUTPUT) to 0.
f. Energize and allow 30 minutes for warm-up and stabilization.
8. Frequency and Stability
a. Performance Check
(1) Connect TI OUTPUT terminals to multimeter and frequency counter using step
attenuator.
(2) Set step attenuator to 40 dB.
(3) Set frequency counter impedance to 1 m .
(4) Adjust AMPLITUDE (OUTPUT) control for a 50 V indication on multimeter.
If frequency counter does not indicate between 196 and 204 Hz, perform b below.