Figure 8-11 Source I Configuration; Source I Measure I, Source V Measure V; Basic Circuit Configurations - Keithley 2601 Reference Manual

Section 8: Source-Measure Concepts

Source I measure I, source V measure V

The SourceMeter can measure the function it is sourcing. When sourcing a voltage, you can
measure voltage. Conversely, if you are sourcing current, you can measure the output current. For
these measure source operations, the measure range is the same as the source range.
This feature is valuable when operating with the source in compliance. When in compliance, the
programmed source value is not reached. Thus, measuring the source lets you measure the
actual output voltage.

Basic circuit configurations

Source I
When configured to source current (I-Source) as shown in
as a high-impedance current source with voltage limit capability and can measure current (I-Meter)
or voltage (V-Meter).
For 2-wire local sensing, voltage is measured at the Input/Output terminals of the SourceMeter.
For 4-wire remote sensing, voltage is measured directly at the DUT using the sense terminals.
This eliminates any voltage drops that may be in the test leads or connections between the
SourceMeter and the DUT.
The current source does not require or use the sense leads to enhance current source accuracy.
With 4-wire remote sensing selected, the sense leads must be connected or incorrect operation
will result.
Figure 8-11
Source I configuration
8-16
Series 2600 System SourceMeter® Instruments Reference Manual
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Figure 8-11, the SourceMeter functions
2600S-901-01 Rev. C / January 2008