Temperature - Fluke 8508A User Manual

Ratio Accuracy
Range to Range...................................................... Apply an RSS summation of Net Front Input and Rear Input Accuracy
Within Range .......................................................... Using the 24 hour or 20 minute Transfer Uncertainty specifications as
Settling Time ......................................................... Up to 200 kΩ range generally the same as DC Voltage Filter In but

Temperature

Absolute Resistance
Measurement Uncertainty
Resistance Range
365 day Tcal ±1 °C
±(ppm Reading + mΩ)
95% Confidence Level
0 - 199.990 000 Ω
200 - 1999.900 00 Ω
99% Confidence Level
0 - 199.990 000 Ω
200 - 1999.900 00 Ω
Temperature Readout (Secondary Specifications)
Transfer Uncertainty
Resistance Range
±(ppm Reading + mΩ)
Ω
0 - 199.990 000
Ω
200 - 1999.900 00
Type ....................................................................... 4-wire current reversal resistance measurement with readout of
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
Current Source ..................................................... 1 mA
appropriate, apply an RSS summation of specified accuracy of the Front
Input signal and the specified accuracy of the Rear Input signal
depends on external connections
Temperature Readout
Typical Equivalent Temperature Measurement Uncertainty
[4]
[11]
7.5 + 0.14 25 Ω PRT/SPRT
25 Ω PRT/SPRT
25 Ω PRT/SPRT
100 Ω PRT/SPRT
100 Ω PRT/SPRT
100 Ω PRT/SPRT
7.5 + 0.5 100 Ω PRT/SPRT
9.5 + 0.18
25 Ω PRT/SPRT
25 Ω PRT/SPRT
25 Ω PRT/SPRT
100 Ω PRT/SPRT
100 Ω PRT/SPRT
100 Ω PRT/SPRT
9.5 + 0.6
100 Ω PRT/SPRT
Resistance Measurement Uncertainty
20 Minute ±1 °C
[11]
0.8 + 0.14
0.2 + 0.5
equivalent temperature. 2-wire and 3-wire selectable without current
reversal. Refer to Resistance specifications for additional details.
nominal resistance for up to 100 probes.
Electrical Measurement Specifications
[1] [2] [3]
Nominal
Probe Type

Temperature

(°C)
-200
0
660
-200
0
232
400
-200
0
660
-200
0
232
400
2-Wire 3-Wire
Adder Adder
15 °C - 30 °C
(Ω) (Ω)
0.1 0.005
0.1 0.005
Specifications
[17]
Resistance
Accuracy
(Ω) ± (°C)
5 0.0016
25 0.0033
84 0.0096
20 0.0007
100 0.0023
185 0.0042
250 0.0069
5 0.0021
25 0.0042
84 0.0122
20 0.0009
100 0.0029
185 0.0053
250 0.0086
[1] [2] [3]
Temp Coeff. ± ppm Reading/°C
5 °C - 15 °C
30 °C - 40 °C
0.6 1.0
0.5 0.8
5
[17]
[12]
5-13