LORD MicroStrain Sensing Systems Carrier Amplifier-Oscillator/Demodulator for DVRTs® Inductive, Capacitive and Resistive Bridge Circuits DEMOD-DC®

Carrier Amplifier-Oscillator /Demodulator for DVRTs®; Inductive, Capacitive and Resistive Bridge Circuits. Overview The DEMOD-DC® in-line signal conditioner makes DVRT® sensors as easy to use as a potentiometer. With integral signal conditioning electronics, the user connects power, ground and analog out, and the DEMOD-DC® outputs a buffered, high-frequency response voltage proportional to linear position. During the manufacturing process the analog output voltage is digitally trimmed, ensuring that every DVRT®’s offset and gain values match one another. The DEMOD-DC® provides internal power regulation and reverse polarity protection, and will operate with a wide range of input voltages. Operating from a DC power supply, the DEMOD-DC® Miniature In-line Signal Conditioner filters incoming transients from the power supply, and supplies a sine wave excitation to the DVRT®. This excitation is used to measure minute impedance changes of the sensing elements. Precision demodulator components provide rectification and differential amplification. Digital trimming ensures conformity from sensor to sensor. The analog output is filtered and buffered to provide clean, high level signals. The DEMOD-DC® is recommended for use with all standard LORD MicroStrain® DVRT® where a lower cost and smaller size signal conditioner is required. If the sensor is expected to be exposed to thermal gradients across its sensing coils (its body), the temperature compensated DEMOD-DVRT® -TC is recommended. Additionally, if the LORD MicroStrain® DVRT® has been customized and built with one coil, the DEMOD-DVRT® -TC is again recommended. Typically, a DEMOD-DC® is ordered with a specific LORD MicroStrain® DVRT® and sold as a pair. The pair is calibrated together at the factory and delivered with a common calibration certificate. This ‘paired’ calibration ensures accurate performance in the user’s hands. The certificate provides several output calculations including Linear Fit, Multi-Segment Fit and Polynomial Fit. Features and Benefits Ease of Implementation out-of-the-box use with all standard LORD MicroStrain® DVRT® sensors miniature body for embedded and space restricted applications identical performance between units for quick scaling High Performance high dynamic range for difficult measurements ready for use with LORD MicroStrain® wireless sensor network