NI Offers Free Calibration Software for Thermocouple Measurement

10/22/2003 - Engineers now can download free thermocouple calibration software from National Instruments to improve the accuracy of all thermocouple measurements. This new software works with the NI LabVIEW graphical development environment to perform multipoint system calibration on any measurement system and any thermocouple type, improving measurement accuracy by up to 400 percent.

The thermocouple calibration software is comprised of two LabVIEW virtual instruments (VIs). The first works with NI signal conditioning hardware to acquire, compile and write calibration points to file. The second VI uses these calibration points to create a best-fit polynomial correction curve that effectively compensates for system and sensor inaccuracy through the entire measurement range, creating greater accuracy for subsequent thermocouple measurements.

In the past, engineers relied on the calibration certificates of individual hardware components to ensure the accuracy of the thermocouple measurement system. The sum of the uncertainties of each piece of hardware, in addition to errors from cables and wiring, limited accuracy. Now, this new LabVIEW-based system calibration software complements hardware component calibration by compensating for these sources of error. This reduces the uncertainty of the measurements in the entire instrumentation system.

This calibration software is ideal for thermocouple measurements in manufacturing test and design validation applications and is especially effective in tests where the measured temperature varies across a wide range. NI thermocouple calibration software works with NI LabVIEW, multifunction data acquisition hardware and SCC/SCXI signal conditioning hardware, as well as third-party hardware. The free software can be downloaded by visiting

About National Instruments
National Instruments ( is a technology pioneer and leader in virtual instrumentation -- a revolutionary concept that has changed the way engineers and scientists approach measurement and automation. Leveraging the PC and its related technologies, virtual instrumentation increases productivity and lowers costs for customers worldwide through easy-to-integrate software, such as the NI LabVIEW graphical development environment, and modular hardware, such as PXI modules for data acquisition, instrument control and machine vision. Headquartered in Austin, Texas, NI has more than 3,000 employees and direct operations in 40 countries. In 2002, the company sold products to more than 25,000 different companies in more than 80 countries around the world. For the past four consecutive years, FORTUNE magazine has named NI one of the 100 best companies to work for in America. Readers may obtain investment information from the company's investor relations department at (512) 683-5090, by sending e-mail to or on the Web at

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