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Verifying the Fuse Health
N O T E
U1271A/U1272A Service Guide
It is recommended that you check the fuse(s) of the
multimeter before using it. Follow the instructions below to
test the fuses inside the multimeter.
Refer to
Figure 2-5
for the respective positions of Fuse 1 (10 × 35 mm,
440 mA/1000 V fast-acting fuse) and Fuse 2 (10 × 38 mm, 11 A/1000 V
fast-acting fuse).
1 Turn the rotary switch to the
connect the red test lead to the
2 To test Fuse 1, place the tip of the test probe on the top
half of
input terminal. Ensure that the probe tip
touches the metal inside the
shown in
Figure 2-
3 To test Fuse 2, place and touch the tip of the test probe
on the left half of
probe tip touches the metal inside the
as shown in
Figure 2-
4 Observe the reading on the instrument's display. Refer to
Table 2- 2
below for the possible readings that could
appear. Replace the fuse when
Table 2-2 Fuse displayed readings
Current input
Fuse Part number Fuse rating
terminal
1
2110-1400
2
2110-1402
Service and Maintenance
Verifying the Fuse Health
/
Smart
input terminal.
input terminal, as
1.
input terminal. Ensure that the
2.
is displayed.
Fuse healthy Replace fuse
440 mA/
1000 V
11 A/
1000 V
2
position and
input terminal,
Displayed readings
≈102 Ω
OL
≈1.5 Ω
OL
35
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