TB 9-4920-469-24
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 applicable sections 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 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 manufacturers' manuals for this TI.
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 check where applicable.
a. Connect test equipment to appropriate power source. Set POWER switch to ON and
allow sufficient warm-up time.
b. Set TI ON/OFF switch to ON.
c. For model TT1000A, perform the TI battery check prior to testing as follows in (1)
and (2) below:
(1) To check the 45 volt battery used for insulation testing, rotate the FUNCTION
selector switch to RESISTANCE MEASURE position and the RESISTANCE RANGE
selector to BAT. If voltage is below 45 volts, replace the 45-volt battery.
(2) To check the six 1.5 volt batteries used for all functions rotate the
RESISTANCE RANGE selector switch to 20 OHM position and short test lead clips
together. Depress the BLACK pushbutton switch. If BAT is displayed replace the six
1.5 volt batteries.
d. For model TT1200, perform the TI battery check prior to testing by setting the
FUNCTION switch to RES MEAS, the RANGE switch to 20 OHM position, and short test
lead clips together. Depress the PTM pushbutton switch. If BAT is displayed replace the
batteries.
e. For model TT1200A, perform the TI battery check prior to testing by pressing the
MENU pushbutton. Replace TI batteries if available battery power goes below 15%.
f. For model TT1200A change the calibration due date following paragraph 12 c (1)
through (10).