The LVDT has distinct advantages over other devices used as a transducer for mechanical positions. Some of these advantages are :
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Linearity of LVDT: Absolute linearity is defined as the largest deviation (or error) voltage of transducer output from the theoretical ideal, measured between zero and full-scale displacement and expressed as a percent of the full-scale output.
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LVDT Sensitivity: In high-frequency excitation, the LVDT sensitivity is practically independent of changes in ambient temperature. Therefore, the sensitivity ratings are measured at a constant voltage, and are expressed as millivolts of output per volts of excitation per unit displacement (usually 0.01 mm) (mV / V / 0.01 mm).
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In absence of any mechanical contact between the primary and secondary windings and the armature, there is no friction or hysteresis.
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There is no mechanical wear and tear ensuring virtually infinite life.
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Linear output assures accurate measurement with direct indicating instruments.
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The resolution is very high, limited only by the indicating and control equipment.
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The electrical output is completely isolated from the input, allowing addition or subtraction of signals without buffer amplifiers.
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High-level output simplifies electronic circuitry.
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Over-ranging does not cause any damage or permanent change in characteristics.
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The LVDT is rugged and shock-resistant, and virtually maintenance-free.