Extech EX450 Digital-Multimeter, DMM, 2,000 counts EX450 Data Sheet

Product codes

EX450

EX450-EU_ENG V3.1 10/07

REPLACING THE FUSES

WARNING: To avoid electrical shock, disconnect the meter from any circuit, remove the
test leads from the input terminals, and turn OFF the meter before opening the case. Do
not operate the meter with an open case.

1.  Disconnect the test leads from the meter.
2.  Remove the protective rubber holster.
3.  Remove the battery cover (two “B”

screws) and the battery.

4. Remove the four “A” screws securing the

rear cover.

5. Lift the center circuit board straight up

from the connectors to gain access to the
fuse holders.

6. Gently remove the old fuse and install the

new fuse into the holder.

7. Always use a fuse of the proper size and

value (0.5A/250V fast blow for the 400mA
range, 20A/250V fast blow for the 20A
range).

8. Align the center board with the connectors and gently press into place.
9. Replace and secure the rear cover, battery and battery cover.

WARNING: To avoid electric shock, do not operate your meter until the fuse cover is in
place and fastened securely.

UL LISTED
The UL mark does not indicate that this product has been evaluated for the accuracy of its
readings.