FLUKE 1504-156 User Manual for the Fluke 1504-156 Thermometer Readout, Tweener Thermistor, ±0.002°C at 0°C Temperature Accuracy

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E -04

Increase or decrease the exponent using the U and D buttons. Once the ex

ponent is correct, press Enter to accept it.

6.4.3 ITS-90 PRT and Coefficients

The ITS-90 option is for PRTs calibrated and characterized using the

Interna-

tional Temperature Scale of 1990

equations. The parameters that appear

when ITS-90 is selected are “R0.01", ”A", “b”, “C”, “d”, “A4", and ”b4". These

should be set with the corresponding values that appear on the calibration cer-

tificate for the PRT. The parameter “R0.01" takes the triple point of water resis-

tance, often labeled ”Rtpw" or “R(273.16K)” on the certificate. Parameters “A”,

“b”, “C”, and “d” take the a

, b

, and d coefficients where

is a number

from 5 to 11. Parameters “A4" and ”b4" take the a4 and b4 coefficients or the

a5 and b5 coefficients on the certificate.

Any ITS-90 parameter of the 1502A

that does not have a corresponding coefficient on the PRT’s certificate must

be set to 0.

The following table shows which parameter to set for each of the coefficients

that may appear on the certificate. The examples that follow demonstrate how

to set the ITS-90 parameters for certain cases. (Note: If the certificate has two

sets of coefficients, one set for “zero-power” calibration and one set for 1 mA

calibration, use the coefficients for the 1 mA calibration.)

18 Manual Rev. 952801 Hart Scientific

6 General Operation

1502A ITS-90 Coefficient Certificate Value

A a5, a6, a7, a8, a9, a10, or a11

b b5, b6, b7, b8, or b9

C c6 or c7

A4 a4 or a5

b4 b4 or b5

Table 1 Matching Certificate Values to 1502A ITS-90 Coefficients

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FLUKE 1504-156 Thermometer Readout, Tweener Thermistor, ±0.002°C at 0°C Temperature Accuracy