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RTD probe readback

I just got a HEL-705-U-1-12-00 RTD temperature probe but cannot make it read back correctly in Labview.

 

The RTD is 1kohm at 0C and -70 to 260C temperature range.  3.85 mOhm / C.  2 wire type.  I entered all this information for the RTD task using Ai0.  I hooked up one lead onto Ai0+(pin1) and the other onto Ai0- (pin2).  I have an NI 6343 DAQ which should be able to handle RTDs.  I used 2.5mA excitation current.  However when I try to read back the temperature it is always giving me at around -250C.  Doesn't make sense because I set the range as -70 to 260.  Also I manually tested the RTD by measuring the resistance.  It is indeed at above 1000 and rises when I heat it up.  What is going on here???

 

Jesse

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Have have you wired up the RTD to the 6343? Differential? RSE? 

 

Corey C

Applications Engineer

National Instruments 

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