Modules LD1 – LD5
Modules LD1 – LD5 are NAI’s latest generation LVDT/RVDT Measurement Modules. These multi-channel programmable modules are used on our multifunction embedded boards and SBCs.
A linear variable differential transformer (LVDT) is a type of electrical transformer/transducer used for measuring linear displacement (position). A counterpart to this device used for measuring rotary displacement is called a rotary variable differential transformer (RVDT). Both types provide output signals (voltages) based upon an AC excitation source. This causes a magnetic flux generated on transformer secondary(ies) by a moveable core proportional to the linear displacement position being gauged.
The modules cover a wide range of excitation voltages/frequency so they can interface to almost any transducer. With isolated excitation and signal input covering 2-, 3-, or 4-wire transducer interfaces and a normalized digital position word based on a percentage of full scale travel, these modules are able to interface to virtually any type LVDT or RVDT transformer.
All LVDT/RVDT modules feature a background self-test capability and most platforms support an optional, programmable AC excitation supply. In addition to state-of-the-art technologies and specialized design algorithms, the modules include many other useful application features such as excitation loss detection, and excitation voltage and frequency measurement. Full-scale operating signal and excitation voltages/frequency between 2-28 Vrms can be specified. Individual excitation inputs are supplied for each channel.