The G123-817 LVDT Oscillator Demodulator is a complete Linear Variable Differential Transformer (LVDT) signal conditioning module. It is used in conjunction with an LVDT to convert transducer mechanical position to a DC voltage of ±10V and a DC current of 4-20mA. The outputs have high accuracy and repeatability with very low noise and ripple.

Due to a unique ratiometric circuit structure, temperature stability and power supply immunity are vastly improved over older style circuits. The module has an oscillator for driving the LVDT primary. Its level is set by a front panel trimpot. Selector switches inside the module set its frequency. A front panel test point enables the level and frequency to be measured. Two output signals are available. They are 0 to ±10V and 4-20mA.

The front panel has a dual colour LED to indicate the level and polarity of the ±10V signal. Inside the module adjustable lag and lead circuits can be switch selected to compensate for LVDT secondary phase changes. Two special monitoring circuits are provided to monitor the phase. This ensures quick and reliable set up when phase adjustments are found to be necessary. The Oscillator Demodulator is housed in a compact DIN rail mounting enclosure and requires a +24V power supply.

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