Part Code Definition

SCXI = NI SCXI modular signal conditioning system platform

1126 = 8-channel isolated frequency input dedicated model code

Technical Specifications

Channel：8 independent isolated differential input channels

Frequency range：10 programmable spans:250Hz/500Hz/1kHz/2kHz/4kHz/8kHz/16kHz/32kHz/64kHz/128kHz

Isolation rating：250Vrms channel-to-chassis & channel-to-channel isolation; max input withstand 1000VDC transient overvoltage protection

Trigger setting：Threshold:-0.5~+4.5V adjustable; Hysteresis:0~4.98V software configurable per channel

Filter：4-order low-pass filter, optional cutoff:1Hz/40Hz/320Hz/1kHz per channel

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

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

Dimension：standard SCXI form factor 173×86×203mm

Interface & Communication Configuration

Front I/O：32pin DIN connector, matching terminal accessories SCXI-1305(BNC type)/SCXI-1320(screw terminal type) for field sensor wiring

Rear bus：standard SCXI backplane golden finger, plug into chassis slot, module data multiplex to single DAQ AI channel via internal SCXI bus, controlled by PCI/PCIe NI DAQ board

Output mode：Multiplex(default)/Parallel dual output configurable via LabVIEW/NI-DAQmx software

Core Functions

Isolate field frequency/pulse signal to eliminate ground loop interference between field equipment and cabinet DAQ system

Convert input frequency signal into proportional DC analog voltage via F/V conversion for standard DAQ analog acquisition

Software independent parameter setup for every channel: frequency span, trigger threshold, anti-jitter hysteresis, noise filter cutoff

Multiplex all 8-channel converted analog signals into single DAQ input channel to save DAQ hardware resource

Overvoltage protection prevents module damage from field surge voltage

Application Scenarios

Turbine speed pickup sensor acquisition, flowmeter pulse signal collection, encoder frequency measurement, motor rotation speed monitoring, industrial bench vibration frequency test, legacy SCXI DAQ system spare replacement

Operation & Maintenance Notes

Power off chassis before hot plug/unplug module; use shielded twisted pair for field frequency wiring to reduce EMI interference; configure corresponding frequency range & filter parameter according to sensor nominal output frequency in DAQ software; regularly fasten terminal block screws to avoid loose contact; keep chassis ventilation free from dust buildup.