Fluke 787 [35/50] Warning

ProcessMeter

Maintenance

Replacing a Fuse

! Warning

To avoid personal injury or damage to the

meter, use only the specified replacement

fuse, 440 mA 1000V fast-blow, Fluke PN

943121.

Both current input jacks are fused with a separate 440 mA

fuse. To determine if a fuse is blown:

1. Turn the rotary switch to mA A L.

2. Plug the black test lead into COM, and the red test

lead into cA.

3. Using an ohmmeter, check the resistance between

the meter test leads. If the resistance is about 1Ω, the

fuse is good. An open means the fuse is blown.

4. Move red test lead to dmA.

5. Using an ohmmeter, check the resistance between

the meter test leads. If the resistance is about 14Ω,

the fuse is good. An open means the fuse is blown.

If a fuse is blown, replace it as follows. Refer to Figure 11

as necessary:

1. Remove the test leads from the meter and turn the

rotary switch to OFF.

2. Remove the battery door.

3. Remove the three Phillips-head screws from the case

bottom and turn the case over.

4. Gently lift the bottom of the front of the case (nearest

the input/output jacks) until the top unsnaps from the

rear half of the case.

5. Replace the blown fuse with the exact type specified:

440 mA 1000V fast-blow fuse, Fluke PN 943121.

Both fuses are the same type.

6. Make sure the rotary switch is in the OFF position.

7. Fit the top of case together, engaging the two snaps

(item A). Make sure that the gasket is properly

seated.

8. Close the case and reinstall the three screws.

9. Replace the battery door.