Agilent Technologies Switch/Measure Resistance Measurement Configuration, Offset Compensation

Features and Functions 2

Resistance Measurement Configuration

This section contains information to help you configure the instrument for making resistance measurements. Use the 2- wire method for ease of wiring and higher density or use the 4- wire method for improved measurement accuracy. The measurement ranges shown below.

100Ω

1 kΩ

10 kΩ

100 kΩ

1 MΩ

10 MΩ

100 MΩ

Autorange

Offset Compensation

Offset compensation removes the effects of any dc voltages in the circuit being measured. The technique involves taking the difference between two resistance measurements on the specified channels, one with the current source turned on and one with the current source turned off.

Applies only to 2- wire and 4- wire resistance measurements on the 100Ω, 1 kΩ, and 10 kΩ ranges.

•Four- wire measurements are not allowed on the multiplexer modules configured for the 1- wire (single ended) mode (see page 27).

•For 4- wire resistance measurements, the instrument automatically pairs channel n in Bank 1 with channel n+20 in Bank 2 (34921A, 34923A, 34925A) or n+35 (34922A, 34924A) to provide the source and sense connections. For example, make the source connections to the HI and LO terminals on channel 2 in Bank 1 and the sense connections to the HI and LO terminals on channel 22 (or 37) in Bank 2.

•The CONFigure and MEASure? commands automatically disable offset compensation.

•The instrument disables offset compensation after a Factory Reset

(*RST command). An Instrument Preset (SYSTem:PRESet command) or Card Reset (SYSTem:CPON command) does not change the setting.

Front Panel Operation: DMM or Channel (Configure) > OFFSET COMP

Remote Interface Operation:

[SENSe:]FRESistance:OCOMpensated {OFFON} [,(@<ch_list>)]

[SENSe:]RESistance:OCOMpensated {OFFON} [,(@<ch_list>)]

If you omit the optional <ch_list> parameter, the command applies to the internal DMM. For 4- wire measurements, specify the paired channel in Bank 1 (source) as the <ch_list> channel (channels in Bank 2 are not allowed in the <ch_list>).

34980A User’s Guide 37