Hi Alberto, The US is replacing meters too, but they are still "Ferraris" electromechanical meters with electronic readouts. The power grid will still need to be kept to a reasonable accuracy for the meters to read with a reasonable accuracy.
The Ferraris type meter (G. Ferraris died 3 years before anyone patented an electric power meter...) has been refined to a point where its ultimate accuracy is 0.01%, but that requires the frequency to be held to a similar degree of precision. We have probably allowed this discussion to stray a little far from "precise time...measurement" I think I'll rein in my end of things... -Chuck Harris Alberto di Bene wrote:
In Italy, almost all of the meters have been replaced by solid state units, which are read remotely through signalling on the power lines. I feared that would have meant an increase in radio noise (I am a radioamateur), but so far I haven't noticed any. This system has the advantage that now the electrical company can apply different rates between day and night, without needing that the meter itself is able to keep the count of the time. At the start of each period a remote command changes the rate.
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