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8.6 Fuse Replacement 185
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8.6 Fuse
Replacement
Use this procedure to remove and replace a line fuse.
To avoid potentially lethal shocks, turn off controller and disconnect it from AC power
before performing these procedures.
For continued protection against fire hazard, replace only with the same fuse type and
rating specified for the line voltage selected.
Test fuse with an ohmmeter. Do not rely on visual inspection of fuse.
1. Locate the line input assembly on the instrument rear panel. See FIGURE 8-2.
2. Turn the power switch OFF (O).
3. Remove the instrument power cord.
4. With a small screwdriver, release the drawer holding the line voltage selector
and fuse.
5. Remove existing fuse(s). Replace with proper slow-blow (time-delay) fuse ratings
as follows:
6. Re-assemble the line input assembly in reverse order.
7. Verify voltage indicator in the line input assembly window.
8. Connect the instrument power cord.
9. Turn the power switch ON (l).
8.7 Factory Reset
Menu It is sometimes necessary to reset instrument parameter values or clear the contents
of curve memory. Both are stored in nonvolatile memory called NOVRAM, but they
can be cleared individually. Instrument calibration is not affected.
8.7.1 Default Values The factory defaults can be reset, and the user curves cleared, using the Factory Reset
menu. To access the Factory Reset menu, press and hold the
Escape key for 5 s. Once
the menu appears, set either Reset to Defaults or Clear Curves, or both, to Yes, then
highlight Execute and press
Enter .
FIGURE 8-2 Power fuse access
100/120 V/220/240 V 2 A T 250 V 5 × 20 mm