What is excitation signal?
April 18, 2010 1:30am CST
I have a problem with my report in my class. I encountered a word excitation signal in my report about linear variable differential transformer.It said,"A small AC reference signal called the excitation signal, 2 to 20Vrms, is applied to a primary winding". Can anyone tell to me what excitation signal means. I owe you a lot for this one, thanks and God bless!
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19 Apr 10
I think in electronics, a signal can be e.g. any analog entity (current or voltage) or a digital code that causes a certain effect. In the mentioned scenario, there is an analog signal in the form of an alternating voltage 2 to 20Vrms. Apparently, the transformer can only work with AC, so that it works as an "idle" reference, which in the case of an LVDT, will actually produce zero output when the "movable core" is in "exactly" between both "mutually cancelling primary windings". When the core is moved from the "total cancellation" position, there will be a a net "differential output" (in the secondary winding) which is a function of the position of the core relative to "null" position. If that made any sense at all then, may God be praised :)