Very different machines. Lock-in amps recover amplitude/phase info at a single frequency on a given input signal. Boxcars are used to recover amplitude info on any waveform using a periodic trigger. The boxcar integrator was invented before the lock-in amp (which are also more commonly found these days).
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I'm not really familiar with either but is the Boxcar Integrator a predecessor of a lock-in amplifier or do they operate differently?
Very different machines. Lock-in amps recover amplitude/phase info at a single frequency on a given input signal. Boxcars are used to recover amplitude info on any waveform using a periodic trigger. The boxcar integrator was invented before the lock-in amp (which are also more commonly found these days).
@@analogwings Thanks for replying; I guess I have some homework to do!