Agilent Technologies Switch/Measure manual RTD Measurements, RTD Type, RO 100 OHM

Features and Functions 2

RTD Measurements

•The instrument supports RTDs with α = 0.00385 (DIN/IEC 751) using ITS- 90 software conversions or α = 0.00391 using IPTS- 68 software conversions. The default is α = 0.00385.

•The resistance of an RTD is nominal at 0 °C and is referred to as R0. The instrument can measure RTDs with R0 values from 49Ω to 2.1 kΩ.

•You can measure RTDs using a 2- wire or 4- wire measurement method. The 4- wire method provides the most accurate way to measure small resistances. Connection lead resistance is automatically removed using the 4- wire method.

•For 4- wire RTD measurements, the instrument automatically pairs channel n in Bank 1 with channel n+20 in Bank 2 (34921A, 34923A) 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.

Front Panel Operation: To select the 2- wire or 4- wire RTD function for the active channel, choose the following items.

DMM or Channel (Configure) > TEMPERATURE > PROBE TYPE > RTD4W RTD

To select the RTD type (α = 0.00385 or 0.00391) for the active channel, choose the following item.

RTD TYPE > 0.003910.00385

To select the nominal resistance (R0) for the active channel, choose the following item.

RO > 100 OHM

Remote Interface Operation: You can use the CONFigure or MEASure? command to select the probe type and RTD type. For example, the following command configures channel 3001 for 2- wire measurements of an RTD with α = 0.00385 (use “85” to specify α = 0.00385 or “91” to specify α = 0.00391).

CONF:TEMP RTD,85,(@3001)

You can also use the SENSe command to select the probe type, RTD type, and nominal resistance. For example, the following command configures channel 1003 for 4- wire measurements of an RTD with α = 0.00391 (channel 1003 is automatically paired with channel 1023 for the 4- wire measurement).

SENS:TEMP:TRAN:FRTD:TYPE 91,(@1003)

34980A User’s Guide 33