Fluke 5720A service manual AC Voltage Frequency Accuracy Test, Output Level Tests For AC V Ranges

Calibration and Verification 3

Full Verification

5.Algebraically add column B to column A. Enter the result on the test record. Verify that it is within the test limits shown.

6.Repeat steps 2 through 5 using the Fluke 742A Resistance Standards and Calibrator output currents shown in Tables 3-25 or 3-26.

7.If the Calibrator is attached to a 5725A Amplifier, connect the Y5020 high-current shunt to the 5725A output terminals. Connect the dc DMM to the Y5020 high- current shunt voltage output connector.

8.Set the Calibrator to 10A, -10A, 5A, 3A and -3A and record the dc DMM readings on the 5725A Amplifier dc current test record. Divide these readings by the certified value of the Y5020 high current shunt, record the resultant current and verify that it is within the test limit shown.

3-21. AC Voltage Frequency Accuracy Test

This test requires the use of a frequency counter. Philips model PM6669 is recommended. Use Table 3-22 for the test record. When using Philips Model PM 6666, it is recommended to use a 1 MHz Low Pass Filter as shown in Figure 3-10. Refer to Table 3-15, Minimum Use Requirements, for substitution information.

1.59 kΩ Resister

Metal Film P/N 344341

Calibrator Main	10 pF	PM6666
	Capacitor	Input A
Output Terminals
	P/N 713875

Mount components on a duel banana adapter from ITT Pomona. Part Number 1837

F3-6A.EPS

Figure 3-10. 1 MHz Low Pass Filter

To check the Calibrator frequency accuracy, proceed as follows:

1.Connect the frequency counter to the output terminals of the Calibrator.

2.Set the Calibrator to 1V at the output frequencies listed in Table 3-22. Verify that the counter reads within the limits shown on the test record.

3.Disconnect the counter from the Calibrator.

3-22. Output Level Tests For AC V Ranges

This test requires the use of equipment listed in Table 3-7.

Table 3-7. Equipment Required for AC V Output Level Tests

Equipment

AC Measurement Standard

BNC(F) to Dual-Banana Plug Adapter (2 required)

Coax Cable - RG-58A/U or RG-58C/U with BNC(M) Connectors, 12 ± 1 inch Long

Model

Fluke 5790A

Pomona 1269

3-31