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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