Fluke 123 - Cursor readout (Fluke 124); Advanced Meter Functions

Fluke 123/124/125
Service Manual
4-6
4.4 Contrast Calibration Adjustment
After entering the Maintenance mode, the test tool display shows
Warming Up (CL 0200):IDLE (valid).
Do not press
now! If you did, turn the test tool off and on, and enter the
Maintenance mode again.
Proceed as follows to adjust the maximum display darkness (CL0100), the default
contrast (CL0110) , and the maximum display brightness (CL0120).
1. Press a three times to select the first calibration step. The display shows:
Contrast (CL 0100) :MANUAL
2. Press CAL. The display will show a dark test pattern, see Figure 4-2
3. Using
adjust the display to the maximum darkness, at which the test pattern
is only just visible.
4. Press to select the default contrast calibration. The display shows:
Contrast (CL 0110) :MANUAL
5. Press CAL. The display shows the test pattern at default contrast.
6. Using
set the display to optimal (becomes default) contrast.
7. Press to select maximum brightness calibration. The display shows:
Contrast (CL 0120) :MANUAL
8. Press CAL. The display shows a bright test pattern.
9. Using
adjust the display to the maximum brightness, at which the test
pattern is only just visible.
10. You can now :
• Exit, if only the Contrast had to be adjusted. Continue at Section 4.7.
OR
• Do the complete calibration. Press
to select the next step (Warming Up),
and continue at Section 4.5.
Figure 4-2. Display Test Pattern