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  TB 55-6625-726-35
Table 4-2. AC Voltmeter (High Range)
Differential multimeter indication (vac)
Test instrument
Min
Max
indications (vac)
1500
13.88
16.12
2250
21.38
23.62
4-3.
AC Current Meter.
a. Performance Check.
(1)
Connect equipment as shown in figure 4-2 and set decade resistor (A2) to read 2 K ohms resistance.
(2)
Set test instrument RANGE SELECTOR switch to 0-750 volt position.
(3)
Set differential multimeter (Al) CURRENT RANGE switch to indicate 10 ma ac.
(4)
Press test instrument ON switch.
(5) Adjust test instrument VOLTAGE CONTROL for 5 ma ac on test instrument AC current meter. Differential
multimeter will indicate between 4.75 and 5.25 ma ac.
(6) Adjust test instrument VOLTAGE CONTROL for-each indication on test instrument AC current meter as
listed in table 4-3. Differential multimeter will indicate within the limits specified in table 4-3.
(7)
Set test instrument VOLTAGE CONTROL to zero.
b. Adjustments. No adjustments can be made.
Table 4-3. AC Current Meter
Differential multimeter indication (vac)
Test instrument
Min
Max
indications (vac)
4
3.75
4.25
3
2.75
3.25
2
1.75
2.25
4-4.
Final Procedure.
a. Deenergize and disconnect all equipment.
b. Annotate and affix DA Label 80, US Army Calibration System, in accordance with TM 38-750. When the test
instrument cannot be adjusted within tolerance, annotate and affix DA Form 2417, Unserviceable or Limited Use Tag.
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