Fluke 9640A Series, Instruction Manual

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9640A
Instruction Manual
2-6
Replacing the Line-Power Fuses
XW
Warning
To prevent fire hazard or damage to the instrument, verify that
the correct fuses are installed for the selected line-voltage
setting. See Table 2-4 for the correct fuse ratings.
The line-power fuses are located on the power block on the rear panel. The selected line-
voltage (115 or 230) shows through a small window toward the bottom of the block. See
Figure 2-1. This instrument has dual fusing with fuses in both the line and neutral
connections. When replacing a blown fuse, replace both fuses to avoid a stressed fuse and
subsequent power interruption. Before trying to access and replace the fuses, verify that
the replacement fuses are appropriate for the selected voltage.
To check or replace the fuses, refer to Figure 2-1, and proceed as follows:
1.
Disconnect the Instrument from line power.
2. Remove the fuse compartment by inserting a screwdriver blade in the tab located at
the left side of the fuse compartment. Gently pry until the compartment can be easily
removed.
3. Pull the fuses from the compartment for replacement or inspection.
4. Install good fuses with the correct ratings. See Table 2-4.
5. Reinstall the fuse compartment by pushing it back into place until the tab locks.
Table 2-4. Line-Power Fuse
Line Power Fuse Action
Fuse Rating
IEC 127
Fluke Part No.
Manufacturer
and Type No.
115 V AC
TH
Time Delay HBC
10 A @ 250 V
2650727
(Quantity 2)
Littelfuse 215010
230 V AC
TH
Time Delay HBC
5 A @ 250 V
2650730
(Quantity 2)
Littelfuse 215005
Selecting Line Voltage
The line-voltage selector is located on the power block on the rear panel. The selected
line-voltage (115 or 230) shows through a small inspection window toward the bottom of
the block. See Figure 2-1. Use Table 2-5 to verify the selection before trying to change it.
Use the following procedure to change the line voltage setting:
1.
Disconnect the Instrument from line power.
2. Remove the fuse compartment as described earlier. (See Replacing the Line-Power
Fuse .)
3. Remove the line-voltage selector by griping its indicator tab with a pair of long-nose
pliers and pulling it straight out of its connector.
4. Rotate the line-voltage selector to show the desired voltage, and reinsert into the
power block.
5. Before inserting the fuse compartment back into the power block, inspect and verify
that both fuses are appropriate for the selected voltage.
6. Insert the fuse compartment into the power block, and press firmly to lock its tab.