Tolerances

Inputs
Results
NIST HB44 Table T6
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NIST HB44 Table T1.1
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USP
—
Inputs
Optional: substitutes for Capacity when computing TP #3–#5.
Test Points
Test Point #1
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—
Test Point #2
—
—
Test Point #3
—
—
Test Point #4
—
—
Test Point #5
—
—
Inputs
Optional: substitutes for Capacity when computing TP #3–#5.
Test Points & Tolerances
#Test PointNIST HB44 T6NIST HB44 T1.1USPRecommended
—
HB44 T6 uses the class-specific breakpoints (in scale divisions) and is rounded to the nearest resolution; NIST/USP are floored to resolution and are at least 1×resolution.
Inputs
0.5110100
Tip: swapping flips “From” and “To”.
kggmg µglbozoz t
kggmg µglbozoz t
Result
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Inputs
Result
Calculated Temperature
—
R₀
100 Ω
Resistance at −200 °C
18.520080 Ω
Resistance at 850 °C
390.481125 Ω
Inputs
Result
Calculated Resistance
—
R₀
100 Ω
Curve
PT-385
Temperature Range
−200 to 850 °C
RTD Conversion Notes
  • PT100 = 100 Ω at 0 °C; PT1000 = 1000 Ω at 0 °C.
  • PT-385 uses A = 3.9083×10⁻³, B = −5.775×10⁻⁷, C = −4.183×10⁻¹².
  • PT-392 uses A = 3.9787×10⁻³, B = −5.87×10⁻⁷, C = −4.0×10⁻¹².
  • Calculations use the Callendar–Van Dusen resistance-temperature equation.
  • This is a practical PT100/PT1000 RTD conversion aid, not a strict ITS-90 SPRT conversion. ITS-90 requires thermometer-specific calibration coefficients.
  • Use the sensor or instrument documentation/calibration certificate to select the proper curve.