Fluke 27 Service Manual

Maintenance
Performance Tests
3
3-13
3-14. Voltage Functions Performance Verification
The following procedure may be used to verify proper operation and calibration of the ac
and dc voltage measurement functions. Required test equipment is listed in Table 3-1.
Caution
Connect the common terminal of the Digital Multimeter
Calibrator to the COM terminal on the UUT.
1. Verify that both the Digital Multimeter Calibrator (hereafter referred to as the DMM
Calibrator) and the UUT are off.
2. Connect the UUT, using the volts/ohms/diode-test input terminal, to the ac output
connections of the DMM Calibrator.
3. Turn the function switch on the UUT to the ac voltage position (G).
4. Switch on power to the DMM Calibrator, and program it for an output of 2.7 V ac, at
100 Hz.
5. Verify that the UUT indicates between 2.684 and 2.716 V ac.
6. Program the DMM Calibrator for an output of 27 V ac, at 10 kHz.
7. Verify that the UUT indicates between 26.43 and 27.57 V ac.
8. Program the DMM Calibrator output for 250 V ac, at 10 kHz.
9. Verify that the UUT indicates between 244.7 and 255.3 V ac.
10. Program the DMM Calibrator for an output of 1000 V ac, at 10 kHz.
11. Verify that the UUT indicates between 967 and 1033 V ac.
12. Program the DMM Calibrator for an output of zero volts.
13. Turn the UUT function switch to the dc voltage position (F).
14. Program the DMM Calibrator output for 2.7 V dc.
15. Verify that the UUT indicates between 2.696 and 2.704 V dc.
16. Program the DMM Calibrator for an output of 27 V dc.
17. Verify that the UUT indicates between 26.96 and 27.04 V dc.
18. Program the DMM Calibrator output to 250 V dc.
19. Verify that the UUT indicates between 249.6 and 250.4 V dc.
20. Program the DMM Calibrator for an output of 1000 V dc.
21. Verify that the UUT indicates between 998 and 1002 V dc.
22. Switch off the DMM Calibrator. Disconnect the Calibrator from the UUT.
3-15. AC and DC Current Performance Verification
The following procedure may be used to test the ac and dc current functions, and to
verify current measurement accuracy.
1. Turn the UUT function switch to the ac mA/A position (mO/A).
2. Connect the DMM Calibrator output to the UUT mA/µA input terminal.
3. Switch on power to the DMM Calibrator and program the DMM Calibrator output
for 27 mA at 50 Hz.
4. Verify that the UUT indicates between 26.58 and 27.42 mA.
5. Program the DMM Calibrator output for 200 mA at 50 Hz.

Fluke 27 Specifications

General

Display Type	LCD
AC Voltage Range	0.1 mV to 1000 V
DC Voltage Range	0.1 mV to 1000 V
AC Current Range	0.1 μA to 10 A
DC Current Range	0.1 μA to 10 A
Battery Type	9V
Continuity	Yes
Diode Test	Yes
Safety Rating	CAT III 600V
AC Current Accuracy	±(1.5% + 2 digits)
Resistance Accuracy	±(0.2% + 1 digit)
DC Voltage Accuracy	±(0.1% + 1 digit)