National Instruments 785068-01

The National Instruments part number 785068-01, also known as the PXIe-4340, is a high-performance PXI Displacement Input Module designed for precise measurement applications. Featuring four simultaneous analog input channels with a 16-bit resolution and a maximum sampling rate of 25.6 kS/s per channel, this module enables accurate data acquisition from AC linear variable differential transformers (LVDTs), AC rotary variable differential transformers (RVDTs), resolvers, and synchros. It accommodates 4-, 5-, and 6-wire LVDT and RVDT configurations, allowing for versatile deployment in various measurement scenarios. Each channel’s excitation frequency and voltage can be independently configured, ensuring optimal performance tailored to specific requirements.

The PXIe-4340 is equipped with advanced diagnostic features, including self-calibration, overcurrent detection, and open coil detection, which contribute to its reliability in field applications. Its built-in remote sensor system continuously compensates for errors caused by long or fine excitation leads, crucial for applications where wire resistance can affect measurements. Furthermore, this module has the capability to measure channel ratios across synchronized inputs, enhancing its utility in complex setups. The self-calibration function adjusts both radiometric gain and offset, effectively mitigating drift on the analog motherboard, while also nullifying the DC component of the excitation source against an internal reference.

Designed for robust performance, the excitation system provides a balanced differential voltage with a maximum tolerance of ±30 V, minimizing the risk of over-voltage damage. The 3 Ω output impedance enhances signal stability and reliability, ensuring minimal interference during operation. The integration of the NI-DAQmx driver facilitates seamless hardware configuration and measurement, streamlining the setup process for users. With 1023 samples FIFO buffer size and support for direct memory access (DMA) data transfers, the PXIe-4340 is an efficient solution for high-demand measurement applications.