NI SCXI-1180 Signal Conditioning Module

Signal Conversion: Supports linear conversion of 4-20mA current signals to 0-5V or 0-10V voltage signals, adapting to the input range of most DAQ devices.

Isolation Feature: Built-in 2500V rms electrical isolation protection effectively suppresses common-mode interference (e.g., ground loop noise) in industrial fields to ensure signal integrity.

Adjustable Gain and Offset: Configure gain (e.g., 1, 2, 5, 10x) and offset via software or hardware to optimize the signal dynamic range.

Filter Function: Integrates a low-pass filter (selectable cutoff frequencies: 10Hz, 100Hz, or 1kHz) to eliminate high-frequency noise (e.g., motor start/stop, electromagnetic interference).

Overload Protection: Supports overcurrent and overvoltage protection to prevent module damage from sensor failures or wiring errors.

Status Monitoring: Front-panel indicators real-time display power, isolation status, and fault alarms for convenient on-site maintenance.

Chassis Adaptability: Can be inserted into 8-slot chassis like the SCXI-1000, with a single module supporting simultaneous conditioning of 4 independent current channels.

Bus Connection: Seamlessly connects to NI DAQ devices (e.g., PCIe, USB series) via SCXI-1324 cables, supporting plug-and-play.

Scenario: Pressure monitoring for chemical reaction vessels

Configuration: SCXI-1000 chassis + SCXI-1180 module + pressure transmitter (4-20mA output) + NI USB-6366 DAQ card

Function: Converts the current signal from the pressure transmitter to a voltage signal, acquires pressure data of the reaction vessel in real time after isolation and filtering, and achieves closed-loop control with LabVIEW.

Scenario: Liquid level monitoring in sewage treatment plants

Configuration: SCXI-1180 + liquid level sensor (4-20mA) + SCXI-1000 chassis + PXIe-6356 acquisition card

Function: Transmits liquid level signals over long distances via current loops (strong anti-interference), with the module providing isolation protection to ensure data reliability in humid environments.

Scenario: Current acquisition in photovoltaic power stations

Configuration: SCXI-1180 + current transformer (4-20mA output) + chassis + DAQ device

Function: Conditions the output current signals of photovoltaic arrays, supports multi-channel synchronous acquisition, and is used for power calculation and power generation efficiency analysis.

Advantage: The 8-slot chassis allows mixed installation of SCXI-1180 (current conditioning) with modules like SCXI-1125 (strain conditioning) and SCXI-1102 (thermocouple conditioning), adapting to complex testing systems with multiple sensor types.

Case: In an automotive production line monitoring system, data from pressure sensors (4-20mA), strain gauges (voltage signals), and temperature sensors (thermocouples) are simultaneously acquired, achieving unified conditioning through the same chassis.

Function: Using LabVIEW's SCXI driver library, one-click configuration of module parameters (e.g., gain, filter frequency), real-time waveform display, and data storage simplify the system development process.

Wiring Specifications: Current input wires must use shielded cables, avoid parallel laying with power cables to reduce electromagnetic interference; ensure the 4-20mA signal loop is closed (e.g., series load resistor).

Grounding Principle: The module's grounding terminal must be uniformly grounded with the chassis to avoid loop currents caused by multiple grounding points.

Abnormal Signal: If the output voltage deviates beyond the allowable range, check whether the input current is normal, whether the gain setting is correct, or calibrate the module zero point via NI MAX software.

Isolation Failure: If ground loop interference occurs, confirm whether the module isolation indicator is normal; replace the module or check the cable shielding layer connection if necessary.