The NI SCXI-1126 is an 8-channel channel-to-channel isolated signal conditioning module launched by National Instruments. It supports independent electrical isolation for every differential input channel, withstanding up to 250 V continuous overvoltage and 1000 V transient surge. It integrates frequency-to-voltage conversion, programmable trigger threshold, hysteresis and four-level 4th-order low-pass filters. Compatible with AC, DC and TTL signals, it supports frequency measurement up to 250 kHz. Featuring 1 MΩ high input impedance and excellent EMI suppression, it fits harsh industrial power and automation sites. It matches standard SCXI chassis and mainstream NI DAQ drivers, widely used for power grid frequency monitoring, rotational speed and AC signal acquisition.
Telephone/WhatsApp: +86 15339537795 Email address: 2645963284@qq.com
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NI SCXI-1126 8-Channel Isolated Frequency/Voltage Input Conditioning Module

NI SCXI-1126 8-Channel Isolated Frequency/Voltage Input Conditioning Module

The NI SCXI-1126 is an 8-channel channel-to-channel isolated signal conditioning module launched by National Instruments. It supports independent electrical isolation for every differential input channel, withstanding up to 250 V continuous overvoltage and 1000 V transient surge. It integrates frequency-to-voltage conversion, programmable trigger threshold, hysteresis and four-level 4th-order low-pass filters. Compatible with AC, DC and TTL signals, it supports frequency measurement up to 250 kHz. Featuring 1 MΩ high input impedance and excellent EMI suppression, it fits harsh industrial power and automation sites. It matches standard SCXI chassis and mainstream NI DAQ drivers, widely used for power grid frequency monitoring, rotational speed and AC signal acquisition.
Telephone/WhatsApp: +86 15339537795 Email address: 2645963284@qq.com

Description

Channel Configuration

  • 8-channel fully differential isolated analog input
  • Channel-to-channel & chassis galvanic isolation
  • All channels multiplexed to one DAQ analog input channel

Programmable Input Parameters

  • Voltage input range: ±0.5 V to ±10 V (programmable)
  • Frequency range: 0 Hz to 250 kHz (10 selectable gears)
  • Trigger threshold: -0.5 V ~ 4.48 V, adjustable hysteresis 0 ~ 4.98 V

On-board Low-pass Filter Parameters

  • Full bandwidth: Maximum scan rate 250 kS/s
  • 10 kHz 4th-order filter: Maximum scan rate 8.2 kS/s
  • 100 Hz 4th-order filter: Maximum scan rate 280 S/s
  • 4 Hz 4th-order filter: Maximum scan rate 3.5 S/s for 50/60Hz noise suppression

Key Electrical Specifications

  • Input impedance: 1 MΩ
  • 60Hz CMRR: >110 dB
  • Nonlinearity: 0.003% FSR
  • Overvoltage protection: 250 VDC continuous, 1000 V transient
  • Power consumption: 3.2 W
  • Isolation withstand voltage: 1500 Vrms one-minute isolation

Mechanical & Environmental Specifications

  • Front connector: 96-pin DIN shielded connector
  • Dimension: 172×86×32 mm
  • Operating temperature: -40℃ ~ +85℃

Software Compatibility

  • Drivers: NI-DAQmx, Traditional NI-DAQ
  • Supported software: LabVIEW, LabWindows/CVI, Python, C#

Pros & Limitations

  • Pros: Independent channel isolation, ultra-high overvoltage tolerance, dual voltage/frequency measurement, strong anti-interference for power industry
  • Limitations: Only 8 channels, no built-in cold junction compensation, not applicable for direct temperature measurement

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