Keysight U1251B Guia Del Usuario página 142

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