Model 2601B-PULSE System SourceMeter Instrument Reference Manual Section 4: Sourcing and measuring
2601B-PULSE-901-01A April 2020 4-11
When sourcing voltage with remote sense, the instrument relies on the voltage detected with the
sense lines to provide the proper closed-loop control of its output voltage and to properly limit the
voltage across the device-under-test. If a sense line becomes disconnected from its corresponding
force line, an erroneous voltage is sensed. The output voltage may be adjusted to a level that is
radically different than the programmed voltage level. In addition, the voltage across the device may
exceed the programmed source limit voltage, possibly causing damage to the device or test fixture.
In both cases, the voltage is not measured correctly if a sense lead becomes disconnected from its
corresponding force lead.
You can use contact check to verify that the sense leads are connected before enabling remote
sensing or before turning on the output. Refer to Contact check measurements (on page 4-12).
Use 4-wire remote sensing for the following source-measure conditions:
• When the pulser is enabled
• Sourcing or measuring voltage in low impedance (<1 kΩ) test circuits
• Enforcing voltage compliance limit directly at the DUT
Figure 42: Four-wire 2601B-P-INT connections (remote sensing)
Connections for pulser operation
Pulser measurements must be made using 4-wire (Kelvin) connections. Refer to 4-wire remote
sensing connections (on page 4-10) for connection diagrams.
When making pulser measurements, the allowed maximum total inductance is 3 µH. The open areas
between FORCE leads can introduce inductance. To minimize this inductance, jumper the FORCE
connection shields at the device under test (DUT). The FORCE connection shields are jumpered
inside the 2601B-P-INT, so external jumpers are not needed at the instrument.
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