Testing the Fuses
3 A Current Path
To determine whether the instrument's 3 A current path has a fuse that must be replaced, press
[Cont]
to
put the DMM in continuity measurement mode, and short the HI Input terminal to the 3 A current ter-
minal. If the measurement displays OPEN, one of the two fuses must be replaced. One fuse is accessible
from the instrument's rear panel; the other is internal.
If the 3 A current path has a bad fuse, it is very likely to be the fuse accessible from the lower left corner of
the instrument's rear panel (part number 2110-1547, 3.15 A, 500 VAC/400 VDC, time delay). Simply use
a flat-blade screw driver to turn the fuse holder counter-clockwise and access the fuse. Put the new fuse
into the fuse holder and insert the assembly back into the instrument, turning the fuse holder clockwise to
lock it in place.
If the 3 A path still has a bad fuse, replace the internal 3 A current path fuse as described below.
10 A Current Path (34461A/65A/70A only)
To determine whether the instrument's 10 A current path has a fuse that must be replaced, press
[Cont]
to
put the DMM in continuity measurement mode, and short the HI Input terminal to the 10 A current ter-
minal. If the measurement displays OPEN, replace the internal 10 A current path fuse as described below.
Keysight True
volt
Series Operating and Service Guide
495
Service and Repair
