Part Code Definition

SCXI = NI SCXI modular signal conditioning platform

1141 = fixed model for 8-channel elliptic 8th-order programmable low-pass filter amplifier

Technical Specifications

Channel：8 fully differential independent input channels

Filter type：8th-order Elliptic filter, stopband attenuation 135 dB/octave

Cutoff frequency：10Hz～25kHz, total 10,000 software-selectable discrete frequencies, all channels same cutoff, per-channel filter bypass programmable

Software gain：×1,×2,×5,×10,×20,×50,×100; input span ±50mV~±5V after amplification

Input impedance：10GΩ//40pF(under powered status)

Overvoltage protection：Power-on ±30V per channel; Power-off ±15V withstand

Max scan rate：333kS/s full-module multiplex sampling

External clock：Clock IN/OUT for external frequency-controlled filter cutoff tracking

Operating condition：0℃~+50℃ operation, -40℃~+70℃ storage, RH5%~95% non-condensing

Dimension：Standard SCXI dimension 173×86×203mm

Interface & Communication Configuration

Front I/O：32pin DIN female connector; matching terminal blocks: SCXI-1304(screw terminal shielded)/SCXI-1305(BNC type), terminal supports per-channel AC/DC coupling switch selection

Rear bus：Standard SCXI backplane golden finger; dual output mode configurable:

1.Multiplex mode: all 8CH multiplex into single DAQ AI channel

2.Parallel mode: 8 independent signals to 8 separate DAQ AI ports

Driver：NI-DAQmx≥V8.3, LabVIEW for gain, filter cutoff, bypass parameter setup

Core Functions

1.Elliptic high-stopband attenuation low-pass filtering to eliminate high-frequency aliasing noise for DAQ anti-aliasing pretreatment

2.Programmable differential instrumentation amplification for mV weak sensor signal gain adjustment, suppress common-mode interference

3.Uniform module cutoff frequency + independent single-channel filter bypass, flexible switch filtering/no-filter for mixed-signal test

4.External synchronous clock port for multi-module cascading and tracking filter measurement

5.±30V built-in overvoltage protection prevents DAQ damage from field surge voltage

Application Scenarios

Vibration signal anti-aliasing acquisition, strain/force sensor signal conditioning, dynamic transient test filtering, industrial analog signal pre-filter for DAQ system, legacy SCXI system spare replacement; often cascaded with SCXI-1140 synchronous sampling module

Operation & Maintenance Notes

Power off chassis before plug/unplug module; select AC/DC coupling via terminal block slide switch per input signal feature; configure cutoff frequency per signal highest effective frequency; use shielded twisted differential wiring to reduce EMI; regularly tighten terminal block wiring screws; avoid dust accumulation on chassis ventilation opening.