The Columbia DDCP Series transducers are completely self-contained displacement measurement systems that operate from a low voltage DC power supply or battery. They permit highly accurate readout and recording of an output signal directly without auxiliary signal conditioning electronics. These sensors combine a unique linear differential transformer sensing system with a miniature solid-state oscillator / demodulator and amplifier in a compact design. The precisely calibrated scale factor provides an accurate, low impedance voltage output which is directly proportional to the linear movement of the shaft assembly relative to the transducer body.