NI 9208 16-Channel, +/-20 mA, 24-Bit Analog Input Module (Spring Terminal)

The NI 9208 is a 16-channel analog input module engineered for high-resolution current measurements in industrial and laboratory environments. Built around a 24-bit delta-sigma ADC, this C Series module acquires current signals at 500 S/s in scanned sampling mode with dual conversion time options: 52 ms in high-resolution mode and 2 ms in high-speed mode. The ±20 mA input range accommodates typical industrial current loops while the ±30 V channel-to-COM overvoltage protection safeguards against transient faults.

– Technical Specifications

• Channels: 16 analog input channels
• ADC Resolution: 24-bit delta-sigma
• Sampling Rate: 500 S/s
• Input Range: ±20 mA (±21.5 mA minimum specified, ±22 mA typical advertised)
• Conversion Time: 52 ms (high-resolution mode), 2 ms (high-speed mode)
• Noise Rejection: 66 dB @ 50 Hz, 68 dB @ 60 Hz in high-resolution mode
• Overvoltage Protection: ±30 V maximum, channel-to-COM (one channel at a time)
• Isolation (Spring Terminal): 250 V RMS, Measurement Category II, channel-to-earth ground
• Operating Temperature: -40 °C to 70 °C
• Mechanical: 5 g vibration, 50 g shock
• External Power (Vsup): 30 V / 2 A maximum

– Key Features

• Built-in 50/60 Hz noise rejection for signal integrity in AC environments
• Flexible connector options: spring terminal or 37-pin D-SUB
• Multi-level isolation: bank-to-bank, channel-to-channel, channel-to-earth ground
• Dual conversion modes enabling trade-offs between speed and resolution
• Suitable for Class I, Division 2 and Class I, Zone 2 hazardous locations

– Typical Applications

• Industrial process current monitoring and control loops
• Laboratory precision current measurement systems
• Machine monitoring and predictive maintenance networks
• Power distribution and metering applications

– Compatibility & Integration

The NI 9208 integrates into CompactRIO and CompactDAQ platforms as part of the C Series module ecosystem. Spring terminal connectivity enables direct wiring in field installations; D-SUB options support structured cabling architectures. Module power requirements are supplied by the host chassis.