User Manual Owner's manual

1 Publication 1746-UM022B-EN-P - January 2005
Appendix A
Module Specifications
This appendix lists the specifications for the 1746-NT8
Thermocouple/millivolt Input Module.
Electrical Specifications
Backplane Current Consumption 120 mA at 5V dc
70 mA at 24Vdc
Backplane Power Consumption 2.28W maximum (0.6W at 5V dc, 1.68W at 24V dc)
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 Input Filtering Low pass digital filter with
programmable notch (filter) frequencies
Normal Mode Rejection (between [+]
input and [-] input)
Greater than 100 dB at 50/60 Hz
Common Mode Rejection (between
input and ground)
Greater than 100 dB at 50/60 Hz
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
Greater than 100 dB at 50/60 Hz
Calibration Module autocalibrates at power-up and
approximately every two minutes afterward
Input Over-voltage Protection ±30V dc continuous 600W pulsed for 1 ms.
Isolation 500V dc for 1 minute between inputs and chassis
ground and between inputs and backplane. 12.5V
dc continuous between channels.