TB 9-4940-250-35
(2) Adjust ac calibrator (A1) for 60 Hz output and 60-V ac indication on M1. The ac
calibrator will indicate between 58.2 and 61.8 V ac.
(3) Repeat (2) above for indications listed in table 4.
(4) Connect wires removed in (1) above.
b. Adjustments. No adjustments can be made.
Table 4. Voltage Accuracy
Test instrument
Ac calibrator indications
voltmeter M1 indications
(V ac)
(V Ac)
Min
Max
50
48.2
51.8
40
38.2
41.8
20
18.2
21.8
10
8.2
11.8
5
3.2
6.8
a. Performance Check
(1) Remove wires from M2 and connect as shown in figure 2.
(2) Prepare dc current shunt (A2) and digital voltmeter (A4) for measuring current
of 1 A.
(3) Adjust dc power supply (A3) for full-scale indication on M2. Digital voltmeter
(A4) will indicate between 97 and 103 mV.
5