TB 9-6625-381-24
7. Equipment Setup
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 TI from protective case only when necessary to make adjustments. Replace
cover after completing the adjustment.
b. Connect TI to autotransformer.
c. Connect autotransformer to 115 V ac source and adjust for 115 V ac output.
d. Position controls as listed in (1) through (3) below:
(1) 110V-220V switch (rear of chassis) to 110V.
(2) SELECTOR switch to INSULATION RESISTANCE.
(3) POWER switch to ON.
e. Allow at least 15 minutes for warm-up and stabilization.
f. Meter on TI should indicate between 10 V and 10 mA scale markings. If not, remove
dust cover and adjust R23 (fig. 1) for meter indication midway between 10 V and 10 mA
scale markings.
g. Set SELECTOR switch to LEAKAGE.
8. Meter Accuracy and Leakage
a. Performance Check
(1) Connect multimeter to TI leakage + (positive) and - (negative) binding posts.
(2) Operate and hold METER SWITCH to 60 VOLTS, and adjust OPERATING
VOLTAGE control for a 20 V indication on TI meter. Multimeter will indicate between
18.2 and 21.8 V dc.
(3) Adjust OPERATING VOLTAGE control for a 40 V indication on TI meter.
Multimeter will indicate between 38.2 and 41.8 V dc.
(4) Adjust OPERATING VOLTAGE control for a 60 V indication on TI meter.
Multimeter will indicate between 58.2 and 61.8 V dc.
(5) Release METER SWITCH.