Horizontal (X) Gain And Offset - Fluke PM3082 Service Manual

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7.4

HORIZONTAL (X) GAIN AND OFFSET

- Press softkey SCREEN CALIBR.
- Select 'x-gain' with the softkeys.
- Adjust the TRACK (gain) and A (offset) rotary so that the two vertical lines coincide exactly with
the 3rd and 9th graticule line.
Figure 7.11 Position of lines for horizontal (X) and vertical (Y) gain and offset calibration
7.5 TEXT STABILITY AND X-OFFSET
- Select 'x-text' with the softkeys.
- Adjust the TRACK rotary to maximal stability of the text
- Adjust the A rotary so that the vertical line is exactly in the middle of the graticule.
7.6 VERTICAL (Y) GAIN AND OFFSET
- Select 'y-gain' with the softkeys.
- Adjust the TRACK (gain) and
the 2nd and 8th graticule line.
- Select 'y-offs' with the softkeys.
- Adjust the TRACK rotary so that the horizontal line is exactly in the middle of the graticule.
- Press softkey 'accept' if the screen calibrations are correct.
- Press softkey RETURN to go to the UTIL MAINTENANCE MENU.
7.7 ASTIGMATISM
- Press softkey MANUAL CALIBR.
- Select 'astig' with the TRACK rotary.
- Position the CH1 trace in the centre of the graticule.
- Adjust the rotary for the best possible sharpness of text across the screen: the small dots from
A
which the text is composed must be well visible. Adjustment of the FOCUS rotary is necessary
during the adjustment.
CALIBRATION ADJUSTMENT PROCEDURE
ST6293
A (offset) rotary so that the two horizontal lines coincide exactly with