Spectrum Controls 1746sc-NI8u - Manual (Page 85)

Module Specifications
This appendix lists the specifications for the 1746sc-NI8u Universal analog
Input Module.
Electrical
Specifications
Backplane Current Consumption 120 mA at 5 VDC
100 mA at 24 VDC
Backplane Power Consumption 3.00W maximum (0.6W @ 5 VDC, 2.4W @ 24 VDC)
Number of Channels 8 (backplane and channel-to-channel isolated)
I/O Chassis Location Any I/O module slot except 0
A/D Conversion Method Sigma-Delta Modulation
Input Filtering Low pass digital filter with programmable notch (filter)
frequencies
Normal Mode Rejection (between 100 dB at 50 Hz
[+] input and [-] input) 100 dB at 60 Hz
Common Mode Rejection (between 100 dB at 50/60 Hz
inputs and chassis ground)
Input Filter Cut-Off Frequencies
2.6 Hz at 10 Hz filter frequency
13.1 Hz at 50 Hz filter frequency
15.72 Hz at 60 Hz filter frequency
65.5 Hz at 250 Hz filter frequency
Calibration Module autocalibrates at power-up and
approximately every two minutes afterwards*
Input Overvoltage Protection ±14.5 VDC continuous
250W pulsed for 1 msec.
Input Overcurrent Protection 28 mA continuous
40 mA, 1mS pulsed, 10% duty cycle maximum
Isolation 500 VDC continuous between inputs and chassis
ground and between inputs and backplane.
12.5 VDC continuous between channels of TC / V / i
0 VDC between channels of RTD
* = See page 28 for detailed explanation of auto-calibration.
Appendix A