The NI PXI-4351 is a high-precision temperature and voltage meter module designed for seamless integration into PXI chassis systems. It combines 24-bit sigma-delta analog-to-digital conversion with dual-function measurement capability, supporting 16 differential analog inputs or 14 thermocouple inputs for demanding metrology, research, and industrial test applications.
Technical Specifications
Analog Input & Conversion
• 16 differential or 14 thermocouple input channels
• 24-bit sigma-delta ADC
• Input range: ±15 V; overvoltage protection to ±42 V
• Per-channel low-pass antialiasing filters
• Digital noise rejection at 50 Hz, 60 Hz, and 400 Hz
• Software-selectable ground referencing per channel
• Per-channel open-thermocouple detection via 10 MΩ pull-up to +2.5 VDC
Reading Rates
• Single-channel: 10, 50, 60 readings/s
• Multi-channel: 2.8, 8.8, 9.7 total readings/s
Temperature Measurement Accuracy
• J-type thermocouple: ±0.42 °C
• RTD: ±0.12 °C
• Thermistor: ±0.03 °C
Voltage Measurement
• 5½-digit resolution voltage measurements
Precision Current Sources
• 25 μA excitation source (≤600 kΩ load)
• 1 mA excitation source (≤15 kΩ load)
Digital I/O
• Eight 5 V TTL-compatible digital lines
• Individually configurable as input or output
• 8 mA sink/source per line (64 mA sink, 15 mA source with TBX-68T or CB-68T accessories)
– Key Features
• 68-pin male connector for PXI/CompactPCI integration
• Compact form factor: 2.2 cm × 12.4 cm × 12.6 cm, 0.1 kg
• Channel-by-channel measurement flexibility
• Integrated RTD and thermistor excitation for direct resistive sensor interfacing
– Typical Applications
Precision temperature monitoring in thermal testing, multipoint voltage acquisition in sensor networks, RTD/thermistor characterization, and process validation in laboratory and production environments.
– Compatibility & Integration
The module operates with NI LabVIEW, LabWindows/CVI, Microsoft Visual Basic, C, C++, and VI Logger across multiple operating systems.
