The NI TB-9214 Isothermal Terminal Block provides precision thermocouple signal conditioning for the NI 9214 C Series Temperature Input Module. This 48-pin DIN connector-based accessory establishes a thermally stable environment for 16 thermocouple channels, eliminating temperature-gradient-induced measurement errors. Three integrated cold-junction compensation channels and a 24-bit delta-sigma ADC deliver accurate temperature data across eight NIST-defined thermocouple types.
Technical Specifications
• Module Compatibility: NI 9214 C Series Temperature Input Module
• Connector: 48-pin female DIN to NI 9214 front panel I/O
• Input Channels: 16 thermocouple channels
• Cold-Junction Compensation: Three internal CJC channels
• ADC Resolution: 24-bit delta-sigma
• Voltage Measurement Range: ±78.125 mV
• Maximum Voltage to Earth Ground: 60 VDC
• Channel-to-Earth Isolation: 250 Vrms
• Common-Mode Voltage Reference: ±1.2 V tolerance
• Supported Thermocouple Types: J, K, T, E, N, B, R, S (NIST)
– Key Features
• Offset Error (High-Resolution Mode): 2 μV typical, 8 μV maximum
• Offset Error (High-Speed Mode): 15 μV typical, 23 μV maximum
• Measurement Accuracy – Type J/N (High-Resolution): ±23 °C typical at 23 °C ± 5 °C
• Measurement Accuracy – Type J/N (High-Speed): ±0.04% typical at 25 °C; 0.16% maximum at -40 °C to 70 °C
• Timing Modes: High-resolution (optimized accuracy and noise rejection including power-line frequencies) and high-speed (optimized sample rate and signal bandwidth)
• Open Thermocouple Detection: Supported with configurable offset error compensation
– Typical Applications
Multi-channel temperature acquisition systems requiring high accuracy and uniform thermal conditions. Industrial process monitoring, laboratory calibration rigs, and environmental chamber instrumentation.
– Compatibility & Integration
Direct integration with NI CompactDAQ and NI CompactRIO platforms via the NI 9214 module. Autozero-capable for enhanced measurement stability across temperature ranges and common-mode voltage conditions.
