RaymondFang

The end user is doing this as he would like to confirm that the measurement from USB-TEMP is accurate.

There is a discrepancy of readings from USB-TEMP and a digital multi-meter when connecting USB-TEMP to NTC. The discrepancy is about 10 to 20% between USB-TEMP & digital multi-meter (ohm readings). The discrepancy getting higher as the temperature increases. We have keyed in the correct Steinhart-Hart Coefficients in the Instacal setup. The setup is No Scale (as we want the measured value to be RESISTANCE.) We are using 2-wire NTC, single-sensor configuration. Can you please advise what is the possible cause of discrepancy in readings from InstaCal and ohmmeter ? Thank you.