TB 9-4920-451-35
b. Adjustments
(1) Adjust R58 (fig. 2) for a reading of .1000 MΩ on digital indication.
(2) Adjust R64 (fig. 2) for a reading of .9500 MΩ.
a. Deenergize and disconnect all equipment.
b. Annotate and affix DA label/form in accordance with TB 750-25.
SECTION V
TF20-1 AND TF579
18. Preliminary
Instructions
a. The
instructions outlined in
paragraphs 18 and
19 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
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. Additional
maintenance information is contained in the manufacturer's manual for this TI.
d. Unless otherwise specified, all controls and control settings refer to the TI.
WARNING
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 top protective cover as required for adjustments.
b. Connect autotransformer to
115 V,
400 Hz
source and
adjust for 115 V.
c. Connect TI to
autotransformer using cables supplied with TI.
d. Set POWER ON/OFF switch to on and allow at least 30 minutes for warm-up and
stabilization.