Figure 3: Source V configuration
Source I
When the instrument is configured to source current (I-source), as shown in the figure below, the
instrument 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 HI / LO terminals of the instrument. For 4-wire
remote sensing, voltage is measured directly at the device-under-test (DUT) using the sense
terminals. This eliminates any voltage drops that may be in the test leads or connections between the
instrument and the DUT.
The current source does not require or use the sense leads to enhance current source accuracy.
However, if the instrument is in 4-wire remote sense mode, the instrument may reach limit levels if the
sense leads are disconnected. With 4-wire remote sensing selected, the sense leads must be
connected or incorrect operation results.
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