Fluke Corporation 8508A Extended Specifications 13
Temperature specifications
Type 4-wire current reversal resistance measurement with readout of equivalent temperature.
2-wire and 3-wire selectable without current reversal. Refer to Resistance specifications for
additional details.
Temperature Range -200 °C to 660 °C, readout also available in °F or K.
Linearization ITS-90 or Callendar van Dusen. Entry and storage of coefficients and nominal resistance for
up to 100 probes.
Current Source 1 mA
Temperature Readout
(Secondary Specifications)
[1] [2] [3]
Resistance Measurement Uncertainty
0 - 199.999 999 Ω 0.8 + 0.14 0.1 0.005 0.6 1.0
200 - 1999.999 99 Ω 0.2 + 0.5 0.1 0.005 0.5 0.8
2-Wire Adder
(Ω)
Transfer Uncertainty
20 Minute ±1 °C
±(ppm Reading + mΩ)
[11]
Resistance
Range
Temp Coeff. ± ppm Reading/°C
3-Wire Adder
(Ω)
15 °C - 30 °C
5 °C - 15 °C
30 °C - 40 °C
Temperature Readout
[1] [2] [3]
Typical Equivalent Temperature Measurement Uncertainty
[12]
0 - 199.999 999 Ω 7.5 + 0.14 25 Ω PRT/SPRT -200 5 0.0085
25 Ω PRT/SPRT 0 25 0.0035
25 Ω PRT/SPRT 660 84 0.0025
100 Ω PRT/SPRT -200 20 0.0035
100 Ω PRT/SPRT 0 100 0.0025
100 Ω PRT/SPRT 232 185 0.0020
200 - 1999.999 99 Ω 7.5 + 0.5 100 Ω PRT/SPRT 400 250 0.0025
0 - 199.999 999 Ω 9.5 + 0.18 25 Ω PRT/SPRT -200 5 0.0100
25 Ω PRT/SPRT 0 25 0.0040
25 Ω PRT/SPRT 660 84 0.0025
100 Ω PRT/SPRT -200 20 0.0040
100 Ω PRT/SPRT 0 100 0.0025
100 Ω PRT/SPRT 232 185 0.0020
200 - 1999.999 99 Ω 9.5 + 0.6 100 Ω PRT/SPRT 400 250 0.0025
Probe
Type
Absolute Resistance
Measurement Uncertainty
365 day TCal ±1 °C
[4]
±(ppm Reading + mΩ)
[11]
Resistance
Range
Nominal
Temp (°C)
Resistance
(Ω)
Accuracy
± (°C)
95 % Confidence Level
99 % Confidence Level
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