User manual

Calibration Procedures 1
Basic Operating Test
U1271A/U1272A Service Guide 5
Basic Operating Test
The tests listed below are used to test the basic operability
of the instrument. Repair is required if the instrument fails
the any of the tests.
• “Backlight test”
• “Display test”
• “Current terminal input test”
Backlight test
Press and hold the button while turning the rotary
switch to any other position (OFF to ON). Check that the
multimeter’s backlight is turned on. Press any key to exit
this mode.
Display test
Press and hold the button while turning the rotary
switch to any other position (OFF to ON). Check that all the
annunciators are displayed in the LCD. Compare the display
with the example shown in Figure 1- 1. Press any key to exit
this mode.
Figure 1-1 LCD display screen
Setup
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