I have a digital clock connected to the power grid and therefore synchronized by it. However, this watch advances several minutes a month. I live in a noisy region where there are several factories nearby. They say this is due to noise that travels through the network and affects the clock. It is true?
Yes, the circuitry of a digital clock recognizes the power cycle voltage semicycles using them to provide the timing signal of the time counter, ie a division of 60 Hz by 60 is made to obtain 1 pulse. per second. However, where the mains voltage is dirty, ie transients, variations, surges, spikes and other problems, this dirt can be counted as an additional pulse. So if in 1 minute we have 3 or 4 surges or pulses that mislead the counter, we will not have 60 pulses, but 63 or 64. Adding that in the day by day the clock goes ahead ... One way to avoid The problem is interleaving a filter between the clock and the power grid.
