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III. Installation
Follow these instructions to prepare your console and install the gate bias option. You will need a #2
Phillips head screwdriver to perform this installation.
Insert the Line Fuse
The fuse drawer supplied with the Keithley 6487 holds the instrument line fuse and line voltage
selection module. The drawer holds one 5 mm × 20 mm (0.2 in × .79 in) time delay fuse.
WARNING: To avoid potentially lethal shocks, turn off the power to the system and disconnect it from
AC power before performing these procedures.
CAUTION: For continued protection against fire hazards, use only the same fuse type and rating
specified for the line voltage selected.
1. Turn off power to the system.
2. Determine the voltage for the single phase AC main power at the facility.
3. With a small flat-blade screwdriver positioned at the side of the fuse drawer, gently push in and
to the right to release the fuse drawer.
4. Remove the line voltage selector from the assembly and rotate it to the proper position. The
voltage should be seen in the window.
5. Select one of the provided fuses using Table 1.
Line voltage
100/120 V
220/240 V
Table 1: Power line fuse for the Keithley 6487
6. Insert the fuse into the power module on the Keithley 6487.
Revision 1.1
Figure 1: Fuse for the Keithley 6487
Rating
0.63 A, 250 V, 5 × 20 mm, slow blow
0.315 A, 250 V, 5 × 20 mm, slow blow
P/N 119-845
2
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