Eight-Channel Four-Wire RTD and Resistance Input Modules Operating Instructions

© National Instruments Corp. 11 FP-RTD-124 and cFP-RTD-124
Specifications
These specifications are typical for the range –40 to 70 °C unless
otherwise noted.
Input Characteristics
Number of channels .......................... 8
ADC resolution................................. 16 bits
Type of ADC..................................... Delta-sigma
Input signal ranges (software-selectable by channel)
Temperature................................ 73 to 1123 K
–200 to 850 °C
–328 to 1562 °F
Resistance................................... 0 to 400 Ω
Temperature accuracy
Resolution .........................................0.016 °C
Resistance accuracy
Offset error ................................. 0.03 Ω typical, 0.1 Ω max
Gain error ................................... 0.06% typical, 0.1% max
Resolution................................... 0.0061 Ω
Excitation current.............................. 135 ms pulses of 2 mA every
second
Input noise ........................................ ±1 bit peak-to-peak
Signal input bandwidth ..................... 3 Hz
Update rate........................................ Each channel is updated
once a second
Error
Measured Value
15 to 35 °C –40 to 70 °C
Typical Maximum Typical Maximum
–200 to 150 °C 0.15 0.25 0.30 0.60
150 to 850 °C 0.25 0.50 0.80 1.50