The criTIcal rate of rise of commutaTIng voltage, dv/dt(c), is measured by applying occasional 5-V pulses to the input and increasing the frequency of Vin unTIl the phototriac stays on (latches) after the input pulse has ceased. With no further input pulses, the frequency of Vin is then gradually decreased unTIl the phototriac turns off. The frequency at which turn-off occurs may then be used to calculate the dv/dt(c) according to the formula shown above.
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