Model 2601B-PULSE System SourceMeter Instrument Reference Manual Section 7: Theory of operation
2601B-PULSE-901-01A April 2020 7-23
In the following figure, the instrument uses a 2-wire local sensing configuration and is set to measure
current only by setting it to source 0 V and measure current. Note that to obtain positive (+) readings,
conventional current must flow from HI to LO.
Figure 121: 2601B-PULSE measure current only
Contact check
Contact check is not available if pulse mode is enabled.
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 the following figure, the current from these sources flows through the test leads
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 offset voltages that can occur.
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