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.