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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Features and Functions 3<br />
The resistance of an RTD is nominal at 0 °C and is referred to as R 0 .<br />
The instrument can measure RTDs with R 0 values from 49 to 2.1 k.<br />
You can measure RTDs using a 2- wire or 4- wire measurement method.<br />
The 4-wire method provides the most accurate way to measure small<br />
resistances. Connection lead resistance is automatically removed using<br />
the 4- wire method.<br />
For 4- wire RTD measurements, the instrument automatically pairs<br />
channel n in Bank 1 with channel n+20 in Bank 2 (34921A, 34923A) <br />
or n+35 (34922A, 34924A) to provide the source and sense connections.<br />
For example, make the source connections to the HI and LO terminals<br />
on channel 2 in Bank 1 and the sense connections to the HI and LO<br />
terminals on channel 22 (or 37) in Bank 2.<br />
Front Panel Operation: To select the 2- wire or 4- wire RTD function for the<br />
active channel, choose the following items.<br />
DMM or Channel (Configure) > TEMPERATURE > PROBE TYPE > RTD|4W RTD<br />
To select the RTD type ( = 0.00385 or 0.00391) for the active channel,<br />
choose the following item.<br />
RTD TYPE > 0.00391|0.00385<br />
To select the nominal resistance (R0 ) for the active channel, choose the<br />
following item.<br />
RO > 100 OHM<br />
Remote Interface Operation: You can use the CONFigure or MEASure?<br />
command to select the probe type and RTD type. For example, the<br />
following command configures channel 3001 for 2- wire measurements of<br />
an RTD with = 0.00385 (use “85” to specify = 0.00385 or “91” to<br />
specify = 0.00391).<br />
CONF:TEMP RTD,85,(@3001)<br />
You can also use the SENSe command to select the probe type, RTD type,<br />
and nominal resistance. For example, the following command configures<br />
channel 1003 for 4- wire measurements of an RTD with = 0.00391<br />
(channel 1003 is automatically paired with channel 1023 for the 4- wire<br />
measurement).<br />
SENS:TEMP:TRAN:FRTD:TYPE 91,(@1003)<br />
The following command sets the nominal resistance (R 0 ) to 1000 on<br />
channel 1003.<br />
SENS:TEMP:TRAN:FRTD:RES 1000,(@1003)<br />
<strong>Agilent</strong> <strong>34980A</strong> Mainframe User’s Guide 99