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NI 9227

Product Name
NI-9227 C Series Current Input Module.
Product Introduction
4-channel, 24-bit analog current measurement module for CompactDAQ and CompactRIO systems.
Technical Specifications
Category:
Description
Model: NI-9227
Channels: 4 analog input
Input Type: Current
Resolution: 24 bits
ADC Type: Delta-sigma with analog prefiltering
Sample Rate: 50 kS/s per channel
Safe Operating Range: 5 Arms
Overcurrent Handling: 10 Arms for 1 s with cooldown
Input Impedance: 12 mΩ
Input Coupling: DC
Isolation: 250 Vrms channel-to-channel
Performance Parameters
Typical Scaling: 1.785397 µA/LSB
Input Noise at 50 kS/s: 400 µArms
Calibrated Accuracy at 5 Arms: ±0.1% reading, ±0.05% range typical
Operating Temperature: -40 to 70 °C
Power Consumption: up to 730 mW active, 50 µW sleep
Functional Features
Simultaneous sampling.
Built-in anti-aliasing filter.
Differential floating inputs.
Power and current metering.
Harmonic and RMS analysis when combined with voltage module.
Application Scenarios
Power consumption testing.
Machine current monitoring.
Electronic device test.
Energy metering.
Industrial DAQ systems.
Motor current analysis.
Structural Characteristics
C Series module form factor.
Screw-terminal or snap-in connector versions.
Hot-swappable in supported chassis.
Direct connection to CompactDAQ / CompactRIO backplane.
Working Principle
Current enters AI+ and AI-.
Signal passes through conditioning and delta-sigma ADC.
Each channel is sampled simultaneously.
Digital result is transferred to chassis controller.
Installation Requirements
Insert into compatible NI CompactDAQ or CompactRIO chassis.
Use shielded cable for noisy environments.
Do not exceed 5 Arms continuous per channel.
Follow hazardous-voltage safety rules.
Usage Notes
10 Arms is allowed only briefly with required cooldown.
Avoid unshielded long cable runs near EMI sources.
Calibrate annually for critical measurements.
Do not connect voltages beyond isolation rating.
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