Agilent 34980A Multifunction Switch/Measure Unit *34980-90005*
Agilent 34980A Multifunction Switch/Measure Unit *34980-90005*
Agilent 34980A Multifunction Switch/Measure Unit *34980-90005*
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Resistance <strong>Measure</strong>ment Configuration<br />
Features and Functions 3<br />
This section contains information to help you configure the instrument <br />
for making resistance measurements. Use the 2- wire method for ease of<br />
wiring and higher density or use the 4- wire method for improved<br />
measurement accuracy. The measurement ranges shown below.<br />
Offset Compensation<br />
100 1 k 10 k 100 k 1 M 10 M 100 M Autorange<br />
Offset compensation removes the effects of any dc voltages in the circuit<br />
being measured. The technique involves taking the difference between two<br />
resistance measurements on the specified channels, one with the current<br />
source turned on and one with the current source turned off.<br />
Applies only to 2- wire and 4- wire resistance measurements on the <br />
100, 1 k, and 10 k ranges.<br />
Four- wire measurements are not allowed on the multiplexer modules<br />
configured for the 1- wire (single ended) mode (see page 95).<br />
For 4- wire resistance measurements, the instrument automatically pairs<br />
channel n in Bank 1 with channel n+20 in Bank 2 (34921A, 34923A,<br />
34925A) or n+35 (34922A, 34924A) to provide the source and sense<br />
connections. For example, make the source connections to the HI and<br />
LO terminals on channel 2 in Bank 1 and the sense connections to the<br />
HI and LO terminals on channel 22 (or 37) in Bank 2.<br />
The CONFigure and MEASure? commands automatically disable offset<br />
compensation.<br />
The instrument disables offset compensation after a Factory Reset<br />
(*RST command). An Instrument Preset (SYSTem:PRESet command) or<br />
Card Reset (SYSTem:CPON command) does not change the setting.<br />
Front Panel Operation: DMM or Channel (Configure) > OFFSET COMP<br />
Remote Interface Operation:<br />
[SENSe:]FRESistance:OCOMpensated {OFF|ON} [,(@)]<br />
[SENSe:]RESistance:OCOMpensated {OFF|ON} [,(@)]<br />
If you omit the optional parameter, the command applies to the<br />
internal DMM. For 4- wire measurements, specify the paired channel in<br />
Bank 1 (source) as the channel (channels in Bank 2 are not<br />
allowed in the ).<br />
<strong>Agilent</strong> <strong>34980A</strong> Mainframe User’s Guide 103
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