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DMM4040 and 4050
Safety and Installation Instructions
Current-Input Fuses
The 400 rnA and
10
A inputs are protected by user-replaceable fuses.
• The 400 rnA input is protected by a fuse (F2) rated at 440
rnA,
1000 V (fast
blow), 10,000 A minimum breaking capacity.
• The
10 A
input is protected by a fuse (Fl) rated at 11 A, 1000 V (fast blow),
10,000 A minimum breaking capacity.
&&
Warning
For protection against fire or arc flash, replace a blown fuse
with a fuse of an identical rating.
To test the current-input fuses:
I. With the Meter powered up, plug a test lead into the
VQ+t--jI-III1)
connector.
2.
Press
i
n
]
.
3. Insert the other end of the test lead into the 400
rnA
input connector.
If
the fuse is good, the Meter will read less than 200
Q.
If the fuse is blown, the
Meter will read
(I
V
e r· loa d.
4. Remove the probe from the 400
rnA
connector and insert into the lOA
connector.
If
the fuse is good, the Meter will read less than 1
Q.
If the fuse is blown, the
Meter wi 11 read
0 \)
e r· loa d .
&&
Warning
To avoid electric shock, remove the power cord and any test
leads from the Meter before opening the current-input fuse
access door.
To replace the current-input fuses:
1. Unplug the power cord.
2. Turn the Meter upside down.
3. Remove the retaining screw on the fuse access door. See Figure 3.
•
4. Remove the protective cover from the fuse holders by slightly depressing the
back edge of the cover to unlatch it from the printed circuit board. Pull up on the
back edge of the cover and remove it from the fuse compartment.
5. Remove the defective fuse and replace it with a fuse of an appropriate rating. See
Table 1.
6. Replace the protective cover by pushing it over the fuses while aligning the
catches with the holes in the printed circuit board. Press the cover down until the
•
catches engage the printed circuit board.
7. Replace the fuse access door and install the retaining screw.
•
•
•
12
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