Product Short Description
Product Name
C Series Current Input Module
Product Introduction
The NI 9227 is a 4-channel analog current input module from the National Instruments C Series DAQ platform. It provides 24-bit resolution and 50 kS/s per channel sampling rate, designed for high-accuracy current measurement in power monitoring, energy metering, and electrical test applications.
Description
Technical Specifications
- Number of Channels: 4 differential analog input channels
- ADC Resolution: 24 bits
- Maximum Sampling Rate: 50 kS/s per channel
- Rated Input Current: 5 A RMS per channel
- Overcurrent Protection: 500 A RMS for 1 second, 1250 A for 1 cycle
- Isolation: Channel-to-channel isolation
- Connector Type: Screw terminal
- Operating Temperature: -40°C to 70°C
Functional Features
- Built-in anti-aliasing filters automatically adjusted to sampling rate
- Simultaneous sampling across all channels for synchronized measurement
- High dynamic range for both low and high current measurement
- Compatible with CompactDAQ and CompactRIO chassis
- NIST-traceable calibration for measurement accuracy
Application Scenarios
- Electrical equipment power consumption testing
- Motor and drive current monitoring
- Power quality and harmonic analysis
- Battery charge/discharge current measurement
- Industrial power distribution system monitoring
Structural Characteristics
- Rugged metal housing for industrial environments
- Front-facing screw terminals for easy field wiring
- Compact form factor for high-density system integration
- Conformal coating option for harsh environment protection
- LED status indicators for module operation
Working Principle
The module receives current input signals through the front terminals, conditions the signals via precision signal conditioning circuitry, and converts the analog current signals to digital data using a 24-bit delta-sigma ADC. The digital data is transmitted to the DAQ chassis backplane for processing by the host controller.
Installation Requirements
- Install into any available C Series slot in CompactDAQ or CompactRIO chassis
- Torque screw terminals to 0.22–0.25 N·m with 14–30 AWG copper wire
- Ensure proper conductor sizing for the measured current level
- Allow sufficient clearance for cable routing
- Ground the chassis properly for safety and noise immunity
Usage Notes
- Do not apply input current exceeding the overcurrent protection rating
- Use twisted-pair shielded wiring for low-noise measurement
- Verify channel configuration in software before starting acquisition
- Avoid routing signal cables near high-voltage power lines
- Perform periodic calibration to maintain measurement accuracy
Reviews
There are no reviews yet.