Service and Maintenance 2
Keysight U1270 Series Service Guide 51
Checking the Fuse
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.
1 Turn the rotary switch to the or position and connect the red test lead
to the Ω input terminal.
2 To test Fuse 1, place the tip of the test probe on the top half of the µA mA
input terminal. Ensure that the probe tip touches the metal inside the µA mA
input terminal, as shown in Figure 2-1.
3 To test Fuse 2, place and touch the tip of the test probe on the left half of the A
input terminal. Ensure that the probe tip touches the metal inside the A input
terminal, as shown in Figure 2-2.
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 OL is
displayed.
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).
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