TB 9-6625-388-24
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
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.
Adjustments required to calibrate the TI are included in this procedure. Additional
maintenance information is contained in the manufacturers' manuals and TM 11-2019 for this TI.
d. Unless otherwise specified, all controls and control settings refer to the TI.
WARNING
HIGH VOLTAGE is used 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.
NOTE
Model ZM-4B/U positions/connections are used for callouts. For
a. Remove cover of TI and rotate all decade switches at least three times throughout
entire range.
b. Position TI controls as listed in (1) through (6) below:
(1) RES-VAR-MUR switch to RES.
(2) BA switch to INT.
(3) All decade switches to 9.
(4) MULTIPLY BY switch to 1/1.
(5) Unclamp galvanometer.
(6) GA switch to RVM.
c. Connect X1 and X2 terminals of TI to decade resistor. Adjust decade resistor for
indication of 10,100.00 ohms. Momentarily depress sensitivity switches and note that the
galvanometer deflects.
d. Set all decade switches on TI to 0. Reclamp galvanometer and remove mounting screw
from right side of galvanometer. Disconnect decade resistor.