I thought the knowledge that this ccould be done migtht inspire someone to find it again. The formula for the resisttance of negative temperature coeffient thermistors. is agonizingly ccomplex and works in a limited range. When I bought my HP65 I was working with thermistors and tried to match the resistance temperature curve by trying various things. I used only 3 constants for the particular one I was trying to match. The part I recall is adding a large number (~1200) to the temperature in C and taking ln. I used one constant to fit the resistance of that particular size device. It was dirt simple and truly accurate over the full range. I looked in my books for marginal references to what I had done and found none. I thought the knowledge that itt had been done might stimulate others to find it. sam
The lost formula


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