5 Maintenance
140 Keysight U1251B and U1252B User’s and Service Guide
3 To test Fuse 1, place the tip of the test probe on the right half of input terminal
. Ensure that the probe tip touches the metal inside the input terminal,
as shown in the figure above.
4 To test Fuse 2, place and touch the tip of the test probe on the right half of
input terminal . Ensure that the probe tip touches the metal inside the input
terminal.
5 Observe the reading on the instrument's display. Refer to Table 5-3 below for
the possible readings that could appear).
6 Replace the fuse when OL is displayed.
Table 5-3 Measurement readings for fuse checking
Current input terminal Fuse Fuse rating
Fuse OK
(approximately)
Replace fuse
Displayed readings
1 440 mA/1000 V 6.2 M OL
2 11 A/1000 V 0.06 OL
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