RtdTerm

The SpacerLabs "RtdTerm" software enables the features and configuration settings of the MAX31865 Resistor Temperature Detector ( RTD ) to digital converter chip ( see previous post ) to be easily evaluated and experimented with. A 2-wire PT100 RTD has been connected on this occasion; 3 and 4 wire RTDs are also supported.

'RtdTermv1.06' user interface

 

 

PT-100 RTD

Resistor Temperature Detectors ( RTD ) made from Platinum (Pt) are more accurate than thermocouple wires for measuring temperature. A 2-wire PT-100 RTD was tested using a MAX31865 RTD to digital converter chip on an evaluation board, and usb-spi dongle controlled by SpacerLabs "SpiConfig v3.0" software.

The tiny PT100 RTD is just visible on the extreme right

Result of reading measurement data from MAX31865 using 'SpiConfig'

From the MISO ( master in, slave out ) bytes the temperature was found to be 19.92 C.

[ Note: PT-100 has 100 ohm resistance at 0C ].