Checking And Replacing The Fuses - Fluke ProcessMeter 789 Calibration Manual

789
Calibration Manual

Checking and Replacing the Fuses

To avoid personal injury or damage to the ProcessMeter, use only the
specified replacement fuse, 440 mA 1000 V fast-blow, Fluke PN
943121.
Both current input jacks are fused with separate 440 mA fuses. To determine if a fuse is
blown:
1. Turn the rotary function switch to
2. Plug the black test lead into COM, and the red test lead into the
3. Using an ohmmeter, check the resistance between the ProcessMeter test leads. If the
4. Move red test lead to ^.
5. Using an ohmmeter, check the resistance between the ProcessMeter test leads. If the
If a fuse is blown, replace it as follows. Refer to Figure 1 as necessary:
1. Remove the test leads from the ProcessMeter and turn the ProcessMeter OFF.
2. With a standard blade hand screwdriver, turn each battery compartment door screw
3. Remove either fuse by gently prying one end loose, then sliding the fuse out of its
4. Replace the blown fuse(s).
5. Replace the battery compartment door. Secure the door by turning the screws one-
10
resistance is about 1 Ω, the fuse is good. An open reading means that fuse F1 is
blown.
resistance is about 14 Ω, the fuse is good. An open means that fuse F2 is blown.
counterclockwise so that the slot is parallel with the screw picture molded into the
case.
bracket.
quarter turn clockwise.
WXWarning
W
.
c input.
A