User Manual

2400 Series SourceMeter
®
User’s Manual Getting Started 1-11
Line frequency setting
At the factory, the SourceMeter is configured to sense the power line frequency
and automatically select the frequency setting. If, however, the line power source
is noisy, the SourceMeter may select the wrong setting on power-up. If this situa-
tion occurs, noisy measurement readings will result, and accuracy may be
affected. You can manually set the line frequency from the front panel MENU/AD-
CTRL/LINE-FREQ selection, or SYST:LFR by remote.
Fuse replacement
A rear panel fuse protects the power line input of the SourceMeter. If the line fuse
needs to be replaced, perform the following steps:
CAUTION For continued protection against fire or instrument damage, replace
the fuse only with the type and rating listed. If the instrument repeat
-
edly blows fuses, locate and correct the cause of the problem
before replacing the fuse.
1. The fuse is located in a drawer above the AC receptacle (Figure 1-2). At the
bottom of the fuse drawer is a small tab. At this location, use a small bladed
screwdriver to pry the fuse drawer open.
2. Slide the fuse drawer out to gain access to the fuse. Note that the fuse
drawer does not pull all the way out of the power module.
3. Snap the fuse out of the drawer and replace it with the same type
(
Appendix Table 1-1).
4. Push the fuse drawer back into the power module.
Table 1-1
Power line fuse
SourceMeter Fuse description Keithley part number
2400, 2400-LV,
2401, and 2410
250V, 2.5A, 5 × 20mm FU-72
2420, 2425, 2430,
and 2440
250V, 3.15A, 5 × 20mm FU-106-3.15