64LD1-04CP10-02 Apex Signal Twelve LVDT/RVDT-To-Digital Channels Module

The North Atlantic VME-64LD1 Twelve LVDT/RVDT-To-Digital Channels Module is a high-density intelligent DSP-based card that incorporates up to twelve (12) separate transformer isolated programmable LVDT/RVDT-to-Digital tracking converters with extensive diagnostics, and optional programmable excitation supply. Instead of buying cards that are set for specific inputs, the uniqueness of this design makes it possible to acquire the VME-64LD1 standard card that auto-ranges between 2.0 and 28 volts. Operating frequency between 400 Hz and 10 kHz is dependent on model. This card can be used for 4-wire or 3-wire LVDT inputs. The output is computed as A-B/A+B and is expressed as %FS. This card uses a derived reference ratio-metric design approach that is insensitive to magnitude, temperature, frequency and phase shift effects. The ratio-metric technique assures that the output will change only when the LVDT position changes and will ignore excitation voltage variations. The LATCH feature permits the user to read all channels at the same time. Reading will unlatch that channel. The converters utilize a Type II servo loop processing technique that enables tracking, at full accuracy, up to the specified rate. Intermediate transparent latches, on all data outputs, guarantee that current valid data is always available for any channel without affecting the tracking performance of the converters. No interrupts or waiting time are required. If Geographical Addressing is enabled, the board DIP switches will be automatically deactivated. The optional on-board excitation is field programmable.