National Instruments RM-4339

The National Instruments RM-4339 Terminal Block is a specialized rack-mount interface designed to work seamlessly with the PXIe-4339 PXI Strain/Bridge Input Module, facilitating precise debugging and testing applications in industrial automation settings. This terminal block enhances measurement accuracy and operational flexibility with a variety of back-end and front-end connectivity options. It features two 2-pin COMBICON terminals, one 4-pin COMBICON terminal, and three 96-pin female DIN connectors at the rear. The front panel is equipped with 24 RJ50 connectors, three 9-pin D-SUB connectors, three 25-pin D-SUB connectors, and three BNC connectors, enabling versatile connections to various instruments and devices.

Each of the three channels (A, B, and C) supports eight analog input channels, providing robust data capture capabilities. The device assures minimal offset voltage with a maximum of 10 μV and a typical 2 μV at 23°C ±5°C, while maintaining an outstanding stability rating of 0.5 μV/°C. The RM-4339 accepts an external power supply ranging from 6V to 28V, with a maximum current rating of 2.4A and 100mA for each EX+ connection, demonstrating low route resistance of 0.7 Ω between the external power and EX+ channel.

Engineered for reliability, the RM-4339 operates effectively in environments with temperatures between 0°C and 55°C and a relative humidity range of 10% to 90%, making it suitable for challenging conditions. It withstands random vibrations from 5 to 500 Hz and operational shocks of up to 30 g peak. The terminal block supports various bridge completion configurations, including quarter-bridge completion, with resistive values of 120 Ω, 350 Ω, and 1 kΩ, enhancing measurement precision. Additionally, it includes shunt calibration resistors (SCA) and quarter-bridge shunt calibration resistors (SCB) for improved calibration capabilities. The RM-4339 allows for concurrent connection to three NI PXIe-4339 modules, with each channel powered and controlled independently, and supports in-situ calibration, minimizing the need for disconnections during measurement error verification.