Fluke 77 - Battery and Fuse Replacement; Replace Battery and Fuses

Model 77 Series IV
Calibration Information
14
Calibration Adjustment
Perform the calibration adjustment procedures if the Meter fails the performance tests.
The Meter buttons behave as follows when the calibration mode is enabled:
H
Press and hold this button to test the present function. This measurement is uncalibrated and
may be inaccurate. This is normal.
M
Press and hold this button to display the required input.
B
Press this YELLOW button to store the calibration value and advance to the next step. This
button is also used to exit calibration mode after the calibration adjustment sequence is
complete.
Calibration Adjustment Procedure
Use the following steps to adjust the Meter’s calibration:
Switch the Meter to
E
DC.
1. Turn the Meter over and find the Calibration Seal located near the top of the Meter (refer to Figure 4).
2. With a small probe, break the Calibration Seal and press the Calibration Button for 1 second. The
Meter will beep and change to the calibration mode. The display reads C-01, designating the first
calibration step. The Meter remains in calibration mode until the Rotary Function Switch is turned off.
3. Proceed through the calibration steps by entering the input value listed in the table for each step.
Note
When calibrating or measuring ac current, avoid the potential for errors from coupled noise by either:
1. Shorting the VeG to the COM input
or
2. Having NO connection to the VeG input.
Note
After pressing the yellow button, wait until the step number advances before changing the calibrator
source or turning the Rotary Switch.
4. After each input value is applied, press the yellow button to accept the value and proceed to the next
step (C-02 and so forth).
5. When the last step in a function is reached, turn the Rotary Function Knob to the next required
function. The Meter will not allow a step to be completed if the Rotary Function Knob is turned to the
wrong function.
Note
If the calibration adjustment procedure is not completed correctly, the Meter will not operate
correctly. When calibration adjustment is not performed correctly, the Meter displays the messages
CAL and Errand the Meter must be recalibrated.
The Meter is damaged and requires service if:
• CAL and Err messages continue to appear after a proper recalibration.
• EEPr and Err messages are alternating on the display.
• EEPr message appears on the display.