Replacing The Fuses; Line-Power Fuse - Tektronix DMM4020 Technical Reference Manual

Replacing the Fuses

The Meter uses one fuse to protect the line-power input and two fuses to protect the
current-measurement inputs.

Line-Power Fuse

The Meter has a line-power fuse in series with the power supply. Table 2-1 indicates the
proper fuse for each of the four line-voltage selections. The line-power fuse is accessed
through the rear panel.
1. Unplug the power cord.
2. Insert a small screwdriver blade into the narrow recess to the left of the fuse
holder and pry it to the right until the holder pops out. See Figure 2-1.
3. Remove the fuse and replace it with a fuse of an appropriate rating for the
selected line-power voltage. See Table 2-1.
4. Replace the selector block back into the fuse holder.
To avoid electric shock or fire, do not use makeshift fuses or
short-circuit the fuse holder.
Line Voltage Selection
100 / 120
220 / 240
 Warning
Table 2-1. Line Voltage to Fuse Rating
Figure 2-1. Replacing the Line Power Fuse
General Maintenance
Power Considerations
Fuse Rating
0.200 A, 250 V (slow blow)
0.100 A, 250 V (slow blow)
2
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2-5