2: General operation Series 2600B System SourceMeter® Instrument
2-54 2600BS-901-01 Rev. B / May 2013
4-wire remote sensing connections
When sourcing and/or measuring voltage in a low-impedance test circuit, there can be errors
associated with lead resistance. Voltage source and measure accuracy are optimized by using 4-wire
remote sense connections. When sourcing voltage, 4-wire remote sensing ensures that the
programmed voltage is delivered to the DUT. When measuring voltage, only the voltage drop across
the DUT is measured.
When sourcing voltage in remote sense, make sure the sense leads are connected to the DUT. If a
sense lead becomes disconnected, an erroneous voltage will be sensed, and the Series 2600B may
increase the output voltage to compensate. For the Models 2601B, 2602B, 2611B, 2612B, 2635B,
and 2636B, you can use contact check to verify that the sense leads are connected. Refer to Contact
check measurements (on page 2-44).
Use 4-wire remote sensing for the following source-measure conditions:
• Sourcing or measuring voltage in low impedance (<1 kΩ) test circuits.
• Enforcing voltage compliance limit directly at the DUT.
When using 4-wire local sensing connections, make sure to properly configure the Series 2600B
Sense mode selection (on page 2-76
).
Figure 21: Four-wire connections (remote sensing)
Contact check connections
The Models 2604B, 2614B, and 2634B do not perform contact check measurements.
The contact check function prevents measurement errors due to excessive resistance in the source
or sense leads. See Contact check measurements (on page 2-44
) for operation.
Contact check requires both source and sense connections. Refer to 4-wire remote sensing
connections (on page 2-54) for connection scheme.
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