General Maintenance
Fuse Test and Replacement
3
3-5
3. Insert the test lead probe into the 100 mA input terminal. If the fuse is good, the
meter will read between 11 and 15 Ω. If the fuse is blown, the meter will
read >10 MΩ to OL.
4. Remove the test lead probe from the 100 mA input terminal, and insert it into
the 10 A input terminal.
If the fuse is good, the meter will read between .04 and 1.0Ω. If the fuse is blown, the
meter will read >10 MΩ to OL.
3-12. Replacing the 500 mA and 440 mA Input Fuses (F1 and F5)
The 100 mA jack is protected by 2 fuses, F1 and F5. F1 is mounted in the front panel
100 mA input jack (Figure 3-2) and F5 is located inside the meter.
To replace F1, first unplug the line cord. Then press in on the input jack and turn it 90
degrees counterclockwise. Slide out the fuse holder and fuse.
Replace a blown fuse with one of identical rating (see Table 3-1), and reinsert the fuse
and holder into the input terminal socket. Secure the fuse holder by pressing in and
turning the holder 90 degrees clockwise.
To change the internal F5 fuse, see “Replacing the 10 A Input Fuse” later in this section.
Rear Panel
To remove,
Squeeze and slide out
F3 Line Fuse
(T 125 mA, 250 V, Slow Blow)
Fuse Holder
(Spare fuse provided)
Power-Line Cord Connector
qb12f.eps
Figure 3-1. Replacing the Line Fuse (F3)
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