Maintenance
Performance Test
3
3-7
3-5. Performance Test
Performance tests are recommended for incoming inspection, periodic
maintenance, and for verifying the specifications in the Instruction Sheet. If
the instrument fails any part of the test, calibration and/or repair is indicated.
In the performance tests, the Fluke 77 Series III is referred to as the unit under
test (UUT).
3-6. Initial Procedure
1. Allow the UUT to stabilize to room temperature 23°C ± 5°C (73°F ±
9°F).
2. Check the fuses and battery, and replace them if necessary.
Warning
To prevent fire, install fuses in accordance with the
rating shown on the back of the meter.
Warning
To avoid false readings, which could lead to
possible electric shock or personal injury, replace
the battery as soon as the battery indicator (N)
appears.
3-7. DC Voltage Test
Warning
Connect the ground/common/low side of the DC
calibrator to COM on the UUT.
1. Set the UUT function switch to VDC, and connect the DC Voltage
Calibrator output to the z and COM input terminals of the
UUT.
2. Referring to Table 3-2, set the DC Voltage Calibrator for the output
indicated in steps 1 through 4 only. Verify that the UUT display
reading is within the limits shown.
3. Set the DC Voltage Calibrator for an output of +300 mV, and switch
the UUT to the 300 mV function. Verify that the UUT display reading
is within the limits shown in Table 3-2 (step 5).
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