TB 9-6625-1957-24
d. When indications specified in paragraphs 8 through 11 are not within tolerance,
perform power supply check (paragraph 12) prior to making adjustments. If power supply
adjustments are made, repeat paragraphs 8 through 11. Do not perform power supply
check if all other parameters are 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 TI protective cover from TI only to make adjustments and replace upon
completion.
b. Connect T1 to power module using an extender. Connect power module to a 115 V ac
source. Pull power module PWR switch to ON and allow at least 30 minutes for
stabilization.
8. Dc Voltage
a. Performance Check
(1) Set RANGE/FUNCTION switch to 2 DC VOLTS and set INPUT EXT INT to
EXT (out).
(2) Short INPUT HI and LO terminals. If TI does not indicate .0000, perform
8 b below, before proceeding.
(3) Remove short and connect TI input HI to calibrator OUTPUT HI and TI input
LO to calibrator OUTPUT LO.
(4) Set calibrator for a 1.8 Vdc output. If TI does not indicate within limits specified
(5) Repeat technique of (1) and (4) above using TI settings and calibrator outputs
corresponding adjustment as listed in table 3.
Table 3. Dc Voltage
Calibrator
Test Instrument
RANGE/FUNCTION
Indications
Adjustments
Output (V)
setting
Min
Max
1.8
V
2 DC VOLTS
1.7980 V
1.8020 V
R182 +DC CAL
1.8
1.7980 V
1.8020 V
R202 DC CAL
2 DC VOLTS
V
0.5555 V
2 DC VOLTS
0.5547 V
0.5563 V
18
V
20 DC VOLTS
17.980 V
18.020 V
180
V
200 DC VOLTS
179.80 V
180.20 V
900
V
1 k DC VOLTS
898.9
V
901.1
V