DSP-4000 Series
Users Manual
2-34
When the backlight time-out is enabled, the backlight timer starts counting down
after all tests are complete or after the last key entry or movement of the rotary
switch. To restart the backlight timer while the backlight is on, press any key
(except the backlight key) or turn the rotary switch to a new mode.
Adjusting the Display Contrast
To adjust the display contrast, hold down C for 1 second or longer. The
following message appears: USE D U KEYS TO ADJUST CONTRAST.
Adjust the contrast to the desired level then press E to accept the new level.
The display contrast setting is saved in memory when you turn off the test tool.
Selecting a Power Line Filter Frequency
The test tool has a noise filter to keep ac noise (50 Hz or 60 Hz) from affecting
resistance measurements.
To set the frequency of the noise filter to the frequency of your ac power, proceed
as follows:
1. Turn the rotary switch to SETUP.
2. Press $ Page Down until you see the power line frequency setting.
3. Use D to highlight the power line frequency.
4. Press ! Choice.
5. Use D U to highlight the frequency you want.
6. Press E to accept the highlighted frequency.
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