Converting RTD voltage to temperature using SCC-TC module.

[Robert C.]

I'm trying to convert the thermistor voltage from an SCC-TD module to deg C (using VB6). I am using the formulas supplied with the SCC-TC manual. The formula that I'm having problems with is Tk = 1/ [a+b(1nRt)+c(1nRt)^3]. I understand Rt to be the resistance of the thermistor but what is 1n?

If all else fails is there an API call I can make in VB6 for this conversion. I have seen reference to one in C but not VB6.

[Sastry V.]

Hello,

It is not 1n, it is ln i.e., natural logarithm.

The NI-DAQ Users manual talks about the conversion functions.

NI-DAQ Users Manual

Sincerely,
Sastry V
Applications Engineer
National Instruments