Internal Constants Calibration; Setting Lcd Voltage - Fluke 867B Service Manual

867B,863
Service Manual

Internal Constants Calibration

1. Place the 5700A in Standby.
2. Rotate the selector to e (mV DC).
3. Remove the á (Amps) connection and connect the 5700A directly to the Ë and
4. Step 40: Apply 29.00 mV dc. Allow for settling; then press t [Proceed].
5. Press t [Save Cal.] to complete the calibration procedure. Place the Calibrator in
6. Finally, rotate the selector to OFF, wait a few seconds, then rotate the selector to any

Setting LCD Voltage

A separate calibration procedure allows you to establish the existing contrast (SET UP)
setting as a new mid-point LCD voltage. A viewable contrast range can therefore be
reestablished after GMM repair. Although the calibration button must be pressed during
the following procedure, no actual inputs to the GMM are required, and no calibration
constants are altered.
Set the user-selectable contrast level with the following procedure:
1. Rotate the selector to SET UP.
2. Press u or v to set the desired contrast.
3. Press x [Save Set Up].
4. Rotate the selector directly to
Now use the following procedure to permanently save this contrast level as the new mid-
range LCD voltage:
1. Push the calibration button.
2. Press w [Set LCD Voltage]
3. Press x [Abort Cal].
Future adjustments of Set Up - Contrast then establish offsets from this new reference
point and can be stored as the user-selectable contrast level as described above. You can
also restore the GMM to this reference by leaving the selector in SET UP for 15 seconds
without pressing any key.
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â inputs.
standby; then remove all connections between the Calibrator and the GMM.
function to allow the GMM to recognize the new calibration constants.
Calibration constants are stored permanently only when you press t
[Save Cal.]. If you press x [Abort Cal] at any time prior to this, the
GMM immediately returns to normal operation, and no new calibration
constants are retained.
Note
A
(mVDC).
4-33.
4-34.