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b) All Ranges require the Triple Point of Water set-point and the
following:
i) Range 6 requires at least 4 and no more than 10 set-points.
ii) Range 7 requires at least 3 and no more than 10 set-points.
iii) Ranges 8 and 9 require at least 2 but no more than 10 set-points.
iv) Ranges 10 and 11 require at least 1 but no more than 10
set-points.
c) All set-points should fall within the temperature range of the se
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lected High Range.
7. Selecting None for both the Low Range and the High Range is not
permitted.
8. The following ITS-90 coefficients are calculated for each range:
a) RTPW (always calculated)
b) Low Ranges
i) Range 4: a4 and b4
ii) Range 5: a5 and b5
c) High Ranges
i) Range 6: a6, b6, c6 and d
ii) Range 7: a7, b7 and c7
iii) Range 8: a8 and b8
iv) Range 9: a9 and b9
v) Range 10: a10
vi) Range 11: a11
9. Residuals are calculated for each set-point used in calculating the coeffi
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cients with the exception of the Triple Point of Water set-point. Residuals
are always in the same scale as the Reference Probe readings.
3.7.2 IPTS-68 coefficients
The following requirements must be met when IPTS-68 is selected as the type
of coefficients to calculate for Platinum probes. For more information concern
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ing the method used to calculate the IPTS-68 coefficients, see Section 3.8,
Methods Used for Calculating Coefficients.
1. The Reference Probe readings must be in temperature (°C, °F or K).
2. The UUT (test probe) readings must be in resistance (Ohms or KOhms).
3. Exactly 4 set-points must be used:
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3 Coefficients menu
Requirements for calculating coefficients