TB 9-6625-2193-24
CALIBRATION PROCESS
6. Preliminary Instructions
a. The instructions outlined in paragraphs 6 and 7 are preparatory to the calibration
process. Personnel should become familiar with the entire bulletin before beginning the
calibration.
b. Items of equipment used in this procedure are referenced within the text by common
name as listed in table 2.
c. Unless otherwise specified, verify the results of each test and, whenever the test
requirement is not met, take corrective action before continuing with the calibration.
Additional maintenance information is contained in the manufacturer's manual for this TI.
d. When indications specified in paragraph 8 are not within tolerance, perform power
supply check prior to making adjustments. If adjustments are made, repeat paragraph 8.
Do not perform power supply check if parameter is within tolerance.
e. 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 check where applicable.
a. Remove protective cover from TI only when necessary to make adjustments. Replace
cover after completing the adjustments.
b. Connect to an appropriate ac voltage source and press LINE switch to ON. Allow at
least 30 minutes for warm-up.
c. Set front panel ISOLATE switch to ISOLATE.
d. Press RECALL key, then press 0 key twice.
e. Press SHIFT and FILTER keys to ON.
8. Voltage Accuracy
a. Performance Check
(1) Connect calibrator OUTPUT terminals to ratio transformer INPUT and ratio
transformer OUTPUT to TI INPUT terminals.
(2) Set ratio transformer dial settings to .0010000.
(3) Set TI and calibrator output as indicated in table 3. TI will indicate within the
specified limits, if not perform indicated adjustments in table 3.
