Appendices
Specifications
A
A-23
Table A-30. FAI Module 4-Wire Resistance Accuracy Specifications
Accuracy,
3
σ
+ (% input +
Ω
)
18
°
C to 28
°
C -10
°
C to 60
°
C
Range
90 Day
1 Year
1 Year
Slow Fast Slow Fast Slow Fast
300
Ω
.02%+60
m
Ω
.02%+.1
Ω
.02%+.1
Ω
.02%+.2
Ω
.084%+.25
Ω
.084%+.42
Ω
3 k
Ω
.02%+.6
Ω
.02%+2
Ω
.02%+1
Ω
.02%+3
Ω
.084%+2.5
Ω
.084%+8.4
Ω
30 k
Ω
.02%+6
Ω
.2%+200
Ω
.02%+10
Ω
.2%+300
Ω
.084%+25
Ω
.84%+840
Ω
300 k
Ω
.5%+80
Ω
1%+2
k
Ω
.5%+150
Ω
1%+3
k
Ω
2.1%+336
Ω
4.2%+8.4
k
Ω
3 M
Ω
1.3%+1
k
Ω
2%+120
k
Ω
1.3%+2
k
Ω
2%+200
k
Ω
5.46%+4.2
k
Ω
8.4%+200
k
Ω
FAI Module 2-Wire Resistance Measurement Specifications
The FAI Module specifications for the two-wire resistance measurement function
is based on the four-wire resistance measurement specification (above) except you
add a 100 to 300
Ω
positive offset. This value varies for each channel and
temperature gradient (n1%/ºC). Only 30 k, 300 k, and 3 M ranges are
available in 2-wire resistance on the FAI Module.
FAI Module 4-Wire RTD per ITS-1990 Measurement Specifications
The next tables provide FAI Module specifications for the 4-wire Resistance-
Temperature Detector (RTD) measurement function. The 4-wire measurements
use 2 input channels a decade apart, e.g., channels 4 and 14. There is no 2-wire
RTD capability for the FAI Module.
Table A-31. FAI Module 4-Wire RTD Temperature Coefficient
Specification Characteristic
Temperature
Coefficient
To calculate RTD accuracy for temperatures between 28
°
C and
60
°
C, or -10
°
C and 18
°
C, use a linear interpolation between the
two applicable points. For example, if the applicable specification at
28
°
C is 0.2 and the specifications at 60
°
C is 0.75, then the
specification at 40
°
C =(.75-.2)x(40-28)/(60-28)+.2=.406.
Accuracy at -20
°
C
Multiply the -10
°
C to +60
°
C accuracy specification by 2. After 1
hour warm-up. For accuracy between -10
°
C and -20
°
C, interpolate
linearly.
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