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5-18 Source-Measure Concepts

Source I measure I and 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. With the use of the TOGGLE key, you can display the measurement of

any two of the three functions (volts, amps, and ohms) concurrently. For remote operation, you

can measure all three functions concurrently. See Sections 16 and 17.

Source readback accuracy

SourceMeter measurement accuracy is better than sourcing accuracy (see the source and

measure speciﬁcations in Appendix A). For that reason, select the same measurement and

source functions, then use the measured value instead of the programmed source value for opti-

mum accuracy.

Basic circuit conﬁgurations

Source I

When conﬁgured to source current (I-Source) as shown in Figure 5-9, the SourceMeter

functions 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 Source-

Meter. For 4-wire remote sensing, voltage is measured directly at the DUT using the sense ter-

minals. This eliminates any voltage drops that may be in the test leads or connections between

the SourceMeter and the DUT.

NOTE The current source does not require or use the sense leads to enhance current source

accuracy.

Keithley 6430 User Manual

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