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Features and Functions 2
34980A User’s Guide 37
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.
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
100
Ω
, 1 k
Ω
, and 10 k
Ω
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 {OFF|ON} [,(@<ch_list>)]
[SENSe:]RESistance:OCOMpensated {OFF|ON} [,(@<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>).
100Ω 1 kΩ 10 kΩ 100 kΩ 1 MΩ 10 MΩ 100 MΩ Autorange