Section 4: Sourcing and measuring Model 2601B-PULSE System SourceMeter Instrument Reference Manual
4-10 2601B-PULSE-901-01A April 2020
2-wire local sensing connections
Local voltage sensing is only available when the pulser is disabled.
You can use 2-wire local sensing measurements, shown in the following figure, for the following
source-measure conditions:
• Sourcing and measuring current.
• Sourcing and measuring voltage in high impedance (more than 1 kΩ) test circuits.
Make sure to configure the 2601B-PULSE for 2-wire local sensing. Refer to Sense mode selection
(on page 4-25) for information.
Figure 41: Two-wire local sensing 2601B-P-INT connections
4-wire remote sensing connections
When sourcing or measuring voltage in a low-impedance test circuit, there can be errors associated
with lead resistance. Voltage source and measure accuracy is 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 or limiting voltage, only the voltage drop across the
DUT is measured.
When the pulser is enabled, you must use 4-wire remote sensing connections. The instrument uses
remote sensing regardless of the sense setting.
When the pulser is disabled, the default sense setting is 2-wire local. If you need to use 4-wire remote
sensing, you must change the sense. Refer to Sense mode selection (on page 4-25) for information.
When you are using 4-wire voltage sensing, it is critical that you establish and maintain the proper
Kelvin connections between the corresponding force and sense leads to ensure the proper operation
of the instrument and to make accurate voltage measurements. Sense HI must be connected to
Force HI, and Sense LO must be connected to Force LO.
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