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Unformatted text preview: LAB 7: DISPLACEMENT MEASUREMENT LVDTs LVDT stands for Linear Variable Differential Transformer . An LVDT consists of an inner core that moves in and out of an outer sleeve to measure displacement. There is a linear correlation between the displacement of the core and the output voltage, caused by the fact that an LVDT is simply a transformer whose turns ratio varies with the position of the core. Since LVDTs rely on transformers, all LVDTs are both AC-powered and AC-output devices. However, the AC output is typically converted into a 10-V DC output so that the sign of the voltage indicates the direction of the core movement. Sources of Error LVDTs have a specified range; if the core is allowed to move outside the limits of this range, the output is no longer linear and the reading is invalid. Also, LVDTs measure displacement only in the direction of the LVDT core axis. If the LVDT is not aligned with the direction of the displacement you are trying to measure, the reading will be incorrect. CGN3710 LAB 7: DISPLACEMENT MEASUREMENT PRE-LAB 7 1) If the initial LVDT reading was 6.52 volts and you stood on the beam and read +3.76 volts, how much did the If the initial LVDT reading was 6....
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This note was uploaded on 05/21/2011 for the course CGN 3710 taught by Professor Bloomquist during the Summer '10 term at University of Florida.
- Summer '10