Testing The Display; Testing The Backlight; Testing The Keypad - Fluke 1587 Calibration Manual

Testing the Display

The display is an LCD comprised of a series of characters and segments for providing
the user with a variety of information. To test the LCD and all of its segments
proceed as follows:
1. Set the rotary switch to OFF.
2. Depress h and turn the function switch to B.
3. While continuing to depress h, verify that the lit display segments match those
shown in Figure 3.

Testing the Backlight

The display backlight is a toggle function controlled by the H key. Each press of H
causes the backlight to change states, i.e., on to off or off to on. To test the backlight,
press H twice to verify that the toggle function is working. Turn the backlight off.

Testing the Keypad

The keypad consists of the seven keys located above the rotary function switch. To
test the keypad, turn the rotary switch to B and momentarily press each of the seven
keys. Each press of an operational key will cause the Meter to beep. No beep in
response to a key press indicates a defective keypad.
Reset the Meter by turning the rotary switch to OFF and, then, to any other position.
Figure 3. LCD Display Test
Insulation Multimeters
Basic Maintenance
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