Designed for ease of use and general versatility, this printed circuit card provides complete conditioning for MicroStrain's DVRTs®.

Each card contains all the requisite connectors to facilitate plug-and-play use, including: active, jumper selectable low pass filters, input supply line filters with reverse input protection, and output line buffers.

DEMOD-DVRT cards provide high level output from a wide variety of bridge type transducers, including capacitive gap, inductive proximity, electrolytic tilt sensors. Resistive strain gauges may also be conditioned, with the DEMOD's sinewave excitation and sychronous demodulator providing excellent noise rejection and elimination of thermally induced potentials.

Designed to plug directly into MicroStrain's enclosure and power supply motherboard system, DEMOD-DVRT cards are a snap to install. Four and eight channel enclosures are available. Smart MB-STD's are also available, with serial (RS-232) outputs, for direct interface to personal computers. Optional backlit liquid crystal digital displays provide a direct readout in physical units.

How it works

Operating from a DC power supply, the DEMOD-DVRT filters incoming transients from the line voltage, and supplies a pure sinewave excitation to the transducer's bridge. This excitation is used to measure minute impedance changes of the sensing elements.

A differential amplifier raises AC input voltages in order to provide optimum demodulator performance. The output is filtered and buffered to provide clean, high level signals over coaxial cable.