2400 Series SourceMeter
®
User’s Manual Getting Started 1-13
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 (Table 1-2).
4. Push the fuse drawer back into the power module.
Cooling fan
The Models 2410, 2420, 2425, 2430, and 2440 use a cooling fan to help keep them from
overheating. The Model 2400 does not have a cooling fan. In either case (fan or no fan),
proper ventilation must be maintained to prevent overheating. Refer to the “WARNING -
CAUTION” located at the beginning of Section 3 for details on maintaining proper
ventilation.
Model 2410 — Uses a constant-speed fan that runs continuously while the power is on.
Models 2420, 2425, 2430, and 2440 — Uses a 3-speed fan. With the OUTPUT ON, the
fan speed setting is determined by the present current range (source or measure).
Table 1-2
Power line fuse
SourceMeter Fuse description Keithley part number
2400 and 2410 250V, 2.5A, 5 × 20mm FU-72
2420, 2425, 2430,
and 2440
250V, 3.15A, 5 × 20mm FU-106-3.15
2420, 2425, 2430, and 2440 range Fan speed
10uA, 100uA, 1mA Low (50%)
10mA, 100mA Medium (75%)
1A, 3A, 3A/10A (2430) High (100%)
1A, 5A (2440) High (100%)
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