2400 Series SourceMeter
®
User’s Manual Connections 2-7
WARNING When sourcing voltage in remote sense, make sure the sense leads are
connected to the DUT. If a sense lead becomes disconnected, 0V will be
sensed, and the SourceMeter will increase the output voltage (to possi-
bly hazardous levels) to compensate. For increased safety, you can
limit the voltage output by the SourceMeter. See Section 3, “V-source
protection,” to limit the output voltage level.
NOTE When the output is turned off in the 4-wire sense mode, the sense lines are inter-
nally disconnected for safety reasons. The sense lines are automatically recon-
nected when the output is turned on, and 4-wire sensing is restored.
2-wire local sensing
2-wire local sense connections can only be used if the error contributed by test lead IR
drop is acceptable to the user. At current levels below 100mA, the errors are usually not
significant (assuming test lead resistance is not greater than 1Ω).
Since current in a series circuit is the same at all points in the loop, remote sensing does
not improve I-Source or I-Measure accuracy. Thus, if sourcing current and measuring cur-
rent, you can use local sensing. Other conditions that allow the use of 2-wire local sensing
include:
•Test circuit impedance is 1kΩ. Above 1GΩ, guarding should also be used (“Cable
guard”).
• Measure Only (V or I) operation.
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