©
National Instruments Corporation
9
SCC-RTD01 Resistance Temperature Detector User Guide
Specifications
These ratings are typical at 25 °C unless otherwise stated.
Analog Input
Number of input channels ...................... 2 DIFF
Input range
............................................. ±
400 mVDC (fixed gain of 25 on
each channel)
Overvoltage protection
........................... ±
42 VDC powered on
±
25 VDC powered off
Input impedance
Normal powered on ........................ 2 M
Ω
in parallel with 4.7 nF
Powered off..................................... 20 k
Ω
min
Overload.......................................... 20 k
Ω
min
Filter type ............................................... 3-pole Butterworth lowpass filter
–3 dB cutoff frequency ................... 30 Hz
System noise .......................................... 4.5
μ
V
rms
(referred to the input
[RTI]
1
)
Transfer Characteristics
Gain ........................................................ 25
Gain error
............................................... ±
1.2%
Gain-error temperature coefficient
......... ±
10 ppm/
°
C
Offset error
............................................. ±
250
μ
V (RTI)
Offset-error temperature coefficient
...... ±
1.6
μ
V/
°
C
Nonlinearity ........................................... 10 ppm of full scale
Recommended warm-up time ................ 5 min
Amplifier Characteristics
Common-mode rejection ratio ............... 110 dB at 60 Hz
Output range
........................................... ±
10 V
1
Calculated relative to the input range of the module.
