4: Sourcing and measuring 2470 High Voltage SourceMeter Instrument
4-8 2470-901-01 Rev. A / May 2019
You can use 2-wire, or local sensing, measurement techniques for these source-measure conditions:
• Sourcing and measuring low current.
• Sourcing and measuring voltage in high impedance (more than 1 kΩ) test circuits.
• Measure-only operation (voltage or current).
When you use 2-wire sensing, voltage is sensed at the output connectors.
You should only use 2-wire connections if the error contributed by test-lead IR drop is acceptable.
Two-wire local sense connections
Two-wire connections are shown in the following figures.
If your application results in impedances above 1 GΩ, you may also need to use guarding. This
prevents leakage current from affecting measurement accuracy. For information, see Guarding
(on
page 5-15).
To use 2-wire connections, you must set the sense mode of the instrument to 2-wire, as described in
the following topics.
Two-wire local sense connection drawings
Figure 56: Model 2470 2-wire front-panel connections
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