Front Panel Tests - Keithley 2651A Reference Manual

High power system sourcemeter instrument

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Table of Contents

Appendix A: Maintenance

Figure 111: Fuse replacement

5.0 A, 250 V

Perform the following steps to replace the line fuse:

1. Power off the unit and remove the line cord.

2. The fuse drawer (1) is located below the AC receptacle. A small tab is located on the top of the

fuse drawer (2). Using a thin-bladed knife or a screwdriver, pry this tab away from the AC

3. Slide the fuse drawer out to gain access to the fuse (the fuse drawer does not pull completely out

of the power module).

4. Snap the fuse out of the drawer and replace it with the same type (the fuse is specified in the

table below).

To prevent instrument damage, use only the correct fuse type (see table).

5. Push the fuse drawer back into the module.

If the power line fuse continues to blow, a circuit malfunction exists and must be corrected. Return the

unit to Keithley Instruments for repair.

Line voltage

100 V - 240 V

Front panel tests

There are two front panel tests: one to test the functionality of the front panel keys and one to test the

Model 2651A High Power System SourceMeter® Instrument Reference Manual

5 A, 250 V, FAST-

ACTING CARTRIDGE

FUSE, 5 × 20mm

40V, 50A MAX.

Keithley Instruments

2651A-901-01 Rev. A / March 2011