Barcode Reader User Manual

© National Instruments Corporation A-1 SC-2043-SG User Manual
Appendix A
Specifications
This appendix lists the specifications for the SC-2043-SG. These are typical at 25° C unless otherwise noted.
Analog Input
Input Characteristics
Number of channels .................................................... 8 differential
Input signal ranges ...................................................... ±1 V (fixed gain of 10 on each channel)
Max working voltage (signal + common mode)......... Each input should remain within ±11 V of ground
Overvoltage protection ................................................ ±45 V powered on, ±30 V powered off
Inputs protected.................................................... CH<0..7>±
Transfer Characteristics
Nonlinearity ................................................................ ±0.01% FSR
Gain error .................................................................... ±0.15% of reading max
Amplifier Characteristics
Input impedance
Normal powered on.............................................. 10 GΩ
Powered off or overload....................................... 5.2 kΩ
Input bias current ........................................................ ±2.5 nA
Input offset current ...................................................... ±1.5 nA
CMRR ......................................................................... 93 dB min
Output range ................................................................ ±11 V
Dynamic Characteristics
Bandwidth ................................................................... 1.6 kHz (single-pole RC filter)
System noise................................................................ 5 µVrms (referred to input)
Stability
Recommended warm-up time ..................................... 10 minutes
Offset temperature coefficient..................................... ±3.5 µV/°C (referred to input)
Gain temperature coefficient....................................... ±10 ppm/°C
Excitation
Channels ...................................................................... 1, connected to 8 screw terminal pairs
Level............................................................................ 2.5 V, ±0.5% (adjustable from 1.5 to 2.5 V)
Current drive
1
.............................................................. 167 mA at 2.5 V
Drift ............................................................................. ±480 ppm/°C
1
Excitation current drive assumes eight full-bridge 120 Ω strain gauges.