Portable, Modular Signal Conditioning Modules
NI SCC-RTD01 RTD Input
Specifications
SCC-RTD01
Analog Input
Number of input channels .................. 2 differential
Input range.......................................... ±400 mVDC (fixed gain of 25
on each channel)
Maximum working voltage
Model
Channel
Description
Part Number
(signal + common mode) ................ Each input should remain within
±12 V of ground
Overvoltage protection ....................... ±42 Vpk/25 VDC (powered on
or off)
Input impedance ................................. 2 MΩ in parallel with 4.7 nF
powered on; 20 kΩ min
SCC-RTD01
2
2, 3, or 4-wire Pt RTD
777459-18
The National Instruments SCC-RTD01 is a dual-channel module that
accepts 2, 3, or 4-wire platinum RTDs. Each channel of the
NI SCC-RTD01 has an amplifier with a gain of 25 and a 30 Hz lowpass
filter. In addition, the module has a 1 mA excitation source for powering
the RTDs.
powered off
Filter type ............................................ Lowpass 3-pole Butterworth filter
-3 dB cutoff frequency ........................ 30 Hz
System noise....................................... 4.5 µVrms (referred to input)
Transfer Characteristics
Gain .................................................... 25
Gain error ............................................ ±1.2ꢀ
Gain-error temperature coefficient..... ±10 ppm/°C
Offset error.......................................... ±250 µV RTI
Offset-error temperature coefficient.. ±1.± µV/°C
Nonlinearity......................................... 10 ppm of full scale
Recommended warm-up time............. 5 minutes (SCC system only)
Amplifier Characteristics
CMRR .................................................. 110 dB at ±0 Hz
Output range ....................................... ±10 V
Excitation
Number of channels............................
1
Constant-current source ..................... 1 mA
Maximum voltage level without
losing regulation............................. 24 V
Drift .................................................... ±127 ppm/°C
Environment
Operating temperature ....................... 0 to 50 °C
Relative humidity ................................ 5 to 90ꢀ noncondensing
Power Requirements
Analog................................................. 135 mW maximum
Digital.................................................. 153 mW maximum
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NI [ National Instruments ]
