F-2 Contact Check Function 2400 Series SourceMeter
®
User’s Manual
Introduction
This appendix contains information on the contact check function available with the Mod-
els 2400-C, 2410-C, 2420-C, 2425-C, 2430-C, and 2440-C SourceMeters.
Overview
Description
The contact check function detects measurements that may be in error due to excessive
resistance in the force or sense leads when making remotely sensed (Kelvin) measure-
ments. There are many potential sources for this resistance, including poor contact at the
DUT, failing relay contacts on a switching card, and wires that are too long or thin. This is
shown schematically in Figure F-1, where R
C
is the resistance of the mechanical contact at
the DUT, and R
S
is the series resistance of relays and cables.
Figure F-1
Source of Kelvin resistance errors
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