310 Current Input Fuses

The 100 mA and 10 A inputs are protected by replaceable fuses.

• The 100 mA input is protected by 2 fuses, F1 and F5. F1 is rated at F 500 mA, 250 V (fast blow), 1500 A minimum breaking capacity, IEC-127 Sheet I and F5 is rated at 440 mA, 1000 V, 10,000 A minimum interrupt rating, (fast blow) fuse.

• The 10 A input is also protected by a fuse, F2, rated at F 11 A, 1000 V (fast blow), 17,000 A breaking capacity.

3-11. Testing Current Input Fuses

Perform the following procedure to test these fuses:

1. Plug a test lead into the VH^^ input terminal, and power up the meter.

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 W. If the fuse is blown, the meter will read >10 MW 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 1.0W. If the fuse is blown, the meter will read >10 MW 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.

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Figure 3-1. Replacing the Line Fuse (F3)

qb12f.eps

Figure 3-1. Replacing the Line Fuse (F3)

Front Panel Input Terminal

Front Panel Input Terminal

To remove, push in and turn counter clockwise. To insert, reverse this procedure.

Figure 3-2. Replacing the External 100 mA Input Fuse (F1)

Table 3-1. Fuses

Item

Description

Fluke Part No.

WF1

100 mA Input Fuse. F 500 mA, 250 V, (fast blow), 1500 A breaking capacity.

838151

WF2

10 A Input Fuse. F 11 A, 1000 V, (fast blow), 17,000 breaking capacity.

943118

WF3

Line Fuse. T 125 mA, 250 V, (slow blow)

822254

WF5

100 mA Input Fuse. F440 mA, 1000 V, 10,000 A minimum interrupt.

943121

3-13. Replacing the 10 A Input Jack Fuse (F2)

The 10 A input jack is protected by an 11 A fuse (F2), located inside the meter. The following procedure explains how to access and change this fuse. This procedure can also be used to change F5.

1. Remove the single Phillips-head screw on the bottom of the case and the Phillips-head screw on each side of the rear bezel.

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