Table a-1. rtd measurement accuracy, Rtd measurement accuracy amplifier characteristics – National Instruments Module SCXI-1503 User Manual
Page 59
Appendix A
Specifications
A-2
ni.com
Gain = 100
Calibrated
1
................................±25
μV max
±10
μV typ
With autozero enabled
2
............±10
μV max
±5
μV typ
Gain error (relative to calibration reference)
Gain = 1 or 100
Calibrated
................................0.074% of reading max
0.02% of reading typ
RTD Measurement Accuracy
Amplifier Characteristics
Input coupling.........................................DC
Input impedance
Normal powered on .........................>1 G
Ω
Input bias current ....................................±
2.8 nA
1
Assumes 1,000 point average, 25
°C ±10 °C over one year.
2
Assumes 1,000 point average, ±1
°C of autozero temperature.
Table A-1. RTD Measurement Accuracy
Measured
Temperature
°C
100
Ω Max °C
100
Ω Typ °C
1000
Ω Max °C
1000
Ω Typ °C
–100 to 0
0.60
0.23
1.09
0.46
0 to 25
0.62
0.23
1.11
0.47
25 to 100
0.69
0.25
1.20
0.49
100 to 500
1.11
0.37
1.68
0.65
500 to 1200
2.06
0.65
2.81
1.04
Notes: The accuracies in this table reflect using the module in4-wire mode. They do not include errors from the RTD
including lead-wire errors when using 2- or 3-wire connection.
The accuracies assume auto-zero is enabled and the environmental conditions are 25
°C ±10 °C over a one year period.
These accuracies were computed using a standard RTD with a TCR of 3851.