Series 2600 System SourceMeters Reference Manual DUT Test Connections 3-5
Return to Section 3 topics 2600S-901-01 Rev. A / May 2006
Sensing methods
Source-measure operations are performed using either 2-wire local sense
connections or 4-wire remote sense connections.
NOTE The default sense setting is 2-wire local. See “Sense mode selec-
tion” later in this section to check and or change the sense mode.
2-wire local sensing
Two-wire local sensing (as shown in Figure 3-4) can be used for the following
source-measure conditions:
• Sourcing and measuring current.
• Sourcing and/or measuring voltage in high impedance (>1kΩ) test circuits.
Figure 3-4
2-wire connections
DUT
LO
CHANNEL A
LO GLO HI G G G HI
SS
KEITHLEY Series 2600
HI
(local sense)
4-wire remote sensing
When sourcing and/or measuring voltage in a low-impedance test circuit (see Fig-
ure 3-5), there can be errors associated with IR drops in the test leads. 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.
Use 4-wire remote sensing for the following source-measure conditions:
• Sourcing and/or measuring voltage in low impedance (<1kΩ) test circuits.
• Enforce voltage compliance limit directly at the DUT.
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