Maintenance
Calibration
3
3-17
3-25. Calibration
Calibrate the meter once a year to ensure that it performs according to specifications.
The calibration adjustment point is identified in Figure 3-6. Use the following procedure
to calibrate the Fluke 78.
1. Set the DC Voltage Calibrator to 0 volts.
2. Set the Fluke 78 rotary switch to L.
3. Connect the DC Voltage Calibrator to the z and COM input terminals of the
meter.
Note
For autorange with the 4 V range as the lowest range, press the pushbutton
5 times.
4. Set the DC Voltage Calibrator for an output of +3.5 V dc.
5. The Fluke 78 should display 3.500 V dc +/- 0.001. If necessary, remove the four case
screws and case top and adjust R26.
R26 (ADJUST FOR
3.500V DC ± 0.001)
OR 3500 mV DC ± 0001
z10f.eps
Figure 3-6. Calibration Adjustment Point
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