*TB 11-6625-678-35
Table 2-2. Accessories Required
Item
Common name
Description or identifying number
B1
CN-16/U or W010MT3S3
1
B2
Storage battery
BB-433/U, Aircraft type (24 volts)
2
B3
Power supply
PP-3940/G or CS 36CR30 (19 volts dc required)
B4
Cable assembly
CX-9064/ASM-137 (p/o test instrument)
B5
Cable assembly
Alligator clip to single banana plug (red)
B6
Cable assembly
Alligator clip to single banana plug (blk)
1
Obtain on temporary loan basis from shop that is submitting test instrument or calibration.
2
Issued with AN/GSM-256.
Section III. PRELIMINARY OPERATIONS
3-1.
Preliminary Instruction.
a.
Remove Test
Instrument from protective cover.
b. Remove one lead from ammeter rear terminals.
3-2. Equipment Setup. Using test leads supplied with
c. Using meter mechanical adjustments, adjust
meter test set (A2), connect meter test set dc voltage
voltmeter and ammeter for zero indication.
output to rear terminals of Test Instrument voltmeter
observing correct polarity.
NOTE
Do not attempt to adjust hermetically
WARNING
sealed meters having solder sealed
HIGH VOLTAGE is used during the
zeroing adjustments.
performance of this calibration.
DEATH ON CONTACT may result if
d. Verify that the line voltage and frequency to be
personnel fail to observe safety
used during calibration of this Test Instrument remains at
precautions.
115 volts ac 60 Hz by monitoring with variable power
Section IV. CALIBRATION PROCESS
4-1. Timer Accuracy. a. Performance Check.
(2) Adjust meter calibrator for output equal to
(1) Set Test Instrument timer control to indicate
first Test Instrument voltmeter indication listed in table 4-
4 (hours).
1. The Test Instrument will indicate within the limits
(2) Monitor Test Instrument timer with a clock in
specified for meter calibrator listed in table 4-1.
known good condition for a period of one hour.
(3) Repeat technique of (2) above for each Test
(3) At the end of the one hour period Test
Instrument voltmeter indication. Test Instrument will
Instrument timer should indicate a minimum of 58
indicate within limits specified for meter calibrator listed
minutes.
b. Adjustments. No adjustments can be made.
b. Adjustments. No adjustments can be made.
NOTE
Table 4-1. Voltmeter Accuracy
During the performance of the timer
Meter calibrator
Test Instrument
dc output voltage
accuracy check proceed with the
voltmeter indication
minimum
maximum
following calibration checks and
40
39.2
40.8
adjustments.
30
29.2
30.8
20
19.2
20.8
4-2. Voltmeter Accuracy. a. Performance Check.
10
9.2
10.8
Adjust meter test set (A) output voltage for Test
Instrument indications listed in table 4-1. Meter test set
4-4. Ammeter Accuracy. a. Performance Check.
output voltage shall be within limited listed in table 4-1.
(1) Using the test leads supplied with meter test
b. Adjustments. No adjustments can be made.
set (A2), connect meter test set dc current output to rear
terminals of ammeter on Test Instrument, observing
4-3.
correct polarity.
Calibration Facility. a. Performance Check.
(2) Adjust meter test set output current for Test
(1) Connect meter calibrator (A 1) output
Instrument ammeter indications listed in table 4-2. Meter
terminals to rear terminals of Test Instrument voltmeter
test set output current shall be within limits listed in table
observing correct polarity.
b. Adjustments. No adjustments can be made.
3