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Calculating Resistance or Temperature from ITS-90 coefficients

<click on the Excel document below>

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  • Avatar
    Nguyễn Việt Phương

    Temperature range from 660.323 to 961.78 need d coefficient but I didn't see it in your excel file?

  • Avatar
    Elmar Baumhögger

    Thank you very much for the Excel document! It helped me a lot.
    But I found an error:
    Constant aa5 value -0.61893395 (H30) is wrong. It must be -0.61899395.

  • Avatar
    Shane Alldredge

    Thanks Elmar. Correction made.

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    Tom Hugana

    Hi Shane,
    could you please add a comment to the R=>T conversion including cell B22. Is there any reference to this?

  • Avatar
    Alex Arellano

    Hi Shane,
    is there a formula could i used to compute ( a4 b4 a7 b7 c7 results of Nominal current Calibration ) I cant find any formula for this equation . i find it in may sensor calibration certificate. hope you can give me idea how can i compute.


  • Avatar
    Ciro Alberto Sanchez

    Great work. ¡¡¡Congrats!!!

    Could you check out about the titles:
    i. Above Zero Calculator 0.01 °C to 660.323 °C
    ii. Below Zero Calculator -189.3442 °C to 0.01 °C
    iii. K and not °K

  • Avatar
    Ciro Alberto Sanchez
  • Avatar
    Larry Armfield

    a(x)= -1.62474200E-02
    b(x)= 0.00000000E+00
    c7= 0.00000000E+00
    a(x)= -1.61388300E-02
    b(x)= -1.26969300E-04
    Please explain their formulas

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