National Instruments 1142 用户手册

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This appendix lists the specifications for the SCXI-1141/1142/1143 
module. These specifications are typical at 25 

°C unless otherwise noted.

Number of channels ............................... 8 differential

Output signal range ................................ ±5 V

Channel gains (software-selectable) ...... 1, 2, 5, 10, 20, 50, 100

Input overvoltage protection

Powered on ..................................... ±30 V

Powered off..................................... ±15 V

Input coupling ........................................ DC (AC available with 

SCXI-1304 or SCXI-1305 
terminal block)

Input impedance

Powered on ..................................... 10 G

Ω in parallel with 40 pF

Powered off..................................... 2.4 k

Ω

Input bias current ................................... 450 pA

Input bias current
temperature coefficient .......................... 0.8 pA/

°C

Input offset current................................. 250 pA

Common-mode rejection ratio ............... 60 dB (G = 1)