Calibration
6–36
1502C MTDR Service Manual
Push MENU 1 sec to alternate, 2 secs to quit
Figure 6–59: LCD Pattern with Contrast Too Dark
10. Turn R1018 clockwise until the entire pattern is clear and sharp.
Push MENU 1 sec to alternate, 2 secs to quit
Figure 6–60: LCD Pattern Adjusted for Sharpness
11. Press MENU once quickly. The ON pixels will be toggled off and the OFF
pixels will be toggled on. Watch to see if all the pixels are being activated.
12. Once contrast has been set using the LCD pattern, verify it with a normal
waveform display.
a. Ensure that the instrument has been at 75° F
"
5° F (25° C
"
3° C) for at
least one hour (operating or non-operating).
b. Turn the instrument on and allow it to warm up for at least five minutes. If
the instrument was already on (e.g., you are performing this adjustment
immediately after steps 1 – 11), then cycle the power off, then back on again
to return it to default settings.
c. While a waveform is on the display, adjust R1018 on the Front Panel Board
counterclockwise until most of the display has dimmed.
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