Procedure For Models With Firmware Version <2.0; Ac Voltage Adjustment - Fluke ProcessMeter 789 Calibration Manual

The calibration adjustment procedures assume that the person performing
them knows how to use the ProcessMeter and the required equipment. Do
not attempt to calibrate the ProcessMeter unless you are qualified to do so.
Calibration adjustment should be performed in an RF field <1 V/m such as
a laboratory environment.
To prepare for calibration adjustment, do the following:
1. Make sure that you have the required equipment available (see Table 2).
2. Make sure that both fuses in the UUT are intact. See Check and Replace Fuses
earlier in this manual.
3. Turn on and warm up the calibrator as required by its specifications.
4. Remove all input cables from the front of the UUT.
5. Make sure that the UUT is in an ambient temperature between 18 °C and 28 °C
(64.4 °F and 82.4 °F).
Procedure for Models with Firmware Version <2.0

AC Voltage Adjustment

Connect the ProcessMeter to the volt/ohm output of the 5522A calibrator.
1. Turn the UUT switch to S.
2. The calibration button is located on the backside of the ProcessMeter, under the
Calibration Seal. Use a small probe to break the seal.
3. Press and hold the Calibration Button for approximately 2 seconds. The unit will beep
(see Figure 11).
Pressing the Calibration Button puts the ProcessMeter into and out of
calibration mode. The ProcessMeter will remain in calibration mode until
the unit is turned off or the calibration button is pressed a second time.
CAL appears in the bottom display when the ProcessMeter is in calibration
mode.
4. Apply the voltages listed below as prompted by the ProcessMeter.
5. Press  after each sourced value appears. Do not alter the sourced value while
the display reads Busy.
Applied voltages:
•
4 mV @ 60 Hz
•
40 mV @ 60 Hz
•
400 mV @ 60 Hz
•
4 V @ 60 Hz
•
40 V @ 60 Hz
•
400 V @ 60 Hz
•
1000 V @ 60 Hz
6. When Store is displayed, press  to store the calibration value.
Note
Note
ProcessMeter™
Calibration Adjustment
27