Contact Check - Keithley 2601 Reference Manual

Section 8: Source-Measure Concepts
CAUTION
In Figure
and measure current. Note that in order to obtain positive (+) readings, conventional current must
flow from IN/OUT HI to LO.
Figure 8-13
Measure only configurations

Contact check

When a contact check measurement is being performed, two small current sources are switched
in between the HI and SENSE HI terminals and the LO and SENSE LO terminals. By controlling
the switches illustrated in
and through the contact resistance as shown. To accurately measure the resulting contact
resistance, the differential amplifier outputs are measured once with the current sources
connected, and again with the current sources disconnected. This allows for compensation of
various offset voltages that can occur.
8-18
V-Compliance must be set to a level that is higher than the measured
voltage. Otherwise, excessive current will flow into the SourceMeter. This
current could damage the SourceMeter. Also, when connecting an external
voltage to the I-Source, set the output off state to the high-impedance
mode. See ""Compliance
8-13B, the SourceMeter is configured to measure current-only by setting it to source 0V
Figure 8-14, the current from these sources flows through the test leads
Return to
Series 2600 System SourceMeter® Instruments Reference Manual
limit"" earlier in this section for details.
Section Topics 2600S-901-01 Rev. C / January 2008