| http://www.w3.org/ns/prov#value | - Thus, for a coil 502 driven at a first, e.g. sinusoidal, frequency, the amplitude can be determined by using timing signals 602 (FIG. 6) to sample the voltage at a time known to correspond to the peak voltage in the cycle, using a first sampler 606 and sampling at a second point in the cycle known to correspond to the trough using a second sampler 608.
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