Zero crossing

A zero crossing of the time is referred to, inter alia, in the electronics, in which a voltage or current waveform has the value zero. For periodic tasks ( for example, sine, square, triangular, sawtooth voltage ) without superimposed direct voltage, a constant, integer number of zero crossings per cycle to be specified.

A sinusoidal voltage has two zero crossings per period:

• The time (for example, at time t = 0)
• After a half cycle, wherein ( f = frequency of the signal )

After a complete cycle, then at a zero crossing takes place, which is assigned to the next period.

The zero crossing of a signal, for example, in the electronic measurement technology as a trigger or in the circuitry for switching capacitive loads of importance. In the demodulation of the frequency shift of the zero crossing may be used as a simple, error-prone process.