Technical data

1 Calibration Procedures
Basic Operating Test
22 U1270 Series Service Guide
Basic Operating Test
The tests listed below are used to test the basic operability
of the instrument. Repair is required if the instrument fails
any of these tests.
• “Backlight test (U1271A/U1272A only)”
• “Display test”
• “Current terminal input test”
Backlight test (U1271A/U1272A only)
Press and hold the key 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 key while turning the rotary switch
to any other position (OFF to ON).
For U1273A/U1273AX models:
Check that all the OLED pixels are lit. Verify that there are
no dead pixels. Press any key to exit this mode.
Figure 1-1 U1273A/U1273AX OLED display screen
Setup
A
u
t
o
T
r
i
g
H
o
l
d