If an input signal suddenly stops, the FV-1400 outputs at 0V from 1 second after the input signal stops. (Except when the moving average function is in use.)

The output voltage depends on the interval (period) of the input signal. If the input signal suddenly stops, the FV-1400 waits the signal to come for 1 second. However, when there is no input signal for more than 1 second, the output voltage becomes automatically 0V.