On Jan 20, 12:44 pm, Terry S <tschw10...@aol.com> wrote: > Here's an interesting related site: > > http://www.dynamicdemand.co.uk/grid.htm#
Yes - I believe the UK has abandoned long-term 50Hz accuracy - the frequency of the mains has to remain within strict limits, but that variation within those limits is controlled solely by loading/demand and not by the desire to "make the number of cycles in a day correct". Here's an interesting tidbit for those with a CSI interest - forensic scientists in the UK have developed a technique to accurate date some digital (and analogue) recordings made in the UK by doing a narrow bandwidth Fourier analysis of the audio around the 50Hz region (mains hum) for the duration of the recording - the variation they pick up is then compared with historical data regarding the known variation in the UK mains frequency to get an accurate date & time. Further, they can determine if the recording has been edited (and how) by looking for discontinuities in the expected data. How cool is that? Nick -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
