Thermistor Tool

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This program is designed to help work with NTC Thermistors.

It allows to calculate the temperature from a Negative Temperature Coefficient thermistor value and reciprocaly.

It does the calculations using the Steinhart-Hart parameters. Both the QTI and Murata web sites (see links below) are good references. Search Google for more links and references,

Some vendors (such as QTI) provide the full coefficients which allow to calculate the temperature over a wide range with great precision. Other vendors, such as Murata, only provide the B coefficient which requires much less computation but is not as good of an approximation. Typically, Murata provides different values for B depending on the temperature range you are interested in.

Screen Shots

Here is a view of the main window:

It is very simple to use. Enter either the full set of Steinhart-Hart parameters and the nominal resistance at 25 degree in the left frame, or the B parameter in Kelvin and the R0 resistance value in the right frame.

Then enter the input value in the appropriate window and the other value will appear below it.

This program has lots of bugs, but it's free!

The left frame has default parameters for a QTI thermistor of 10kohm nominal with a Y curve (per the QTI web site www.thermistor.com)

The right frame has default values for a Murata thermistor, part number NTSD1XH103FPB30 (www.murata.com)

The frame called "Generate Temp Table" is work in progress. It will be used to generate a look-up table for microprocessor applications that do not require the full precision of the Steinhart-Hart equations.

Check the Release Notes page for credits, downloads, installation, usage and the latest information and bug fixes.

Software License available here.

December 15 2009 00:00:00