VOLTAGE AC PHASE A Meter Calibration Accuracy

Figure 3. Calibration test setup.

(2) Compare voltage levels indicated on volt-meter and

8. VOLTAGE AC PHASE A Meter Calibration

VOLTAGE AC PHASE C meter of unit under test. The

Accuracy. a. Performance Check.

VOLTAGE AC PHASE C meter should indicate voltage

(1) Energize equipment and allow 5 minutes for

level displayed on voltmeter, + 2 percent.

equipment to warm up and stabilize.

b. Adjustments. No adjustments can be made.

(2) Compare voltage levels indicated on volt-meter and

11. AMPERE AC PHASE A Meter Calibration

VOLTAGE AC PHASE A meter of unit under test. The

Accuracy. a. Performance Check.

VOLTAGE AC PHASE A meter should indicate voltage

level displayed on voltmeter + 2 percent.

(1) Trip 115 VOLT AC CIRCUIT BREAKER of unit under

b. Adjustment. No adjustments can be made.

test.

(2) Arrange ammeter connections for 10 ampere

9. VOLTAGE AC PHASE B Meter Calibration

operation and connect to test jacks J10 and J16 of power

Accuracy. a. Performance Check.

monitor test fixture with test leads.

(1) Connect voltmeter to test jacks J2 and J4 of power

(3) Close 115 VOLT AC CIRCUIT BREAKER of unit

monitor test fixture (fig. 2) with test leads.

under test.

(2) Compare voltage levels indicated on volt-meter and

(4) Compare current levels indicated on ammeter and

VOLTAGE AC PHASE B meter of unit under test. The

AMPERE AC PHASE A meter of unit under test. The

VOLTAGE AC PHASE B meter should indicate voltage

AMPERE AC PHASE A meter should indicate current

level displayed on voltmeter, + 2 percent.

level displayed on ammeter, + 2.1 percent.

b. Adjustments. No adjustments can be made.

12. AMPERE AC PHASE B Meter Calibration

10. VOLTAGE AC PHASE C Meter Calibration

Accuracy. a. Performance Check.

(1) Trip 115 VOLT AC CIRCUIT BREAKER of unit under

(1) Connect voltmeter to test jacks J3 and J4 of power

test.

monitor test fixture with test leads.