This discussion of voltage standards is very informative and useful, and my thanks to all who are contributing.
It is clear why precise frequency standards are needed - there are innumerable applications such as GPS, VLBI, secure spread spectrum radio, deep space navigation using doppler, and so on. But I wonder why extreme accuracy is needed in measuring voltage? Don't get me wrong - I have a HP 3456A, and I would love to have a 3458. But the prices on eBay can reach $6k, and I can't see spending that much money for two more digits. As Bill would say, six digits should be enough for everyone:) As well as the HP, I have a number of other DMM's. But the one I use the most is a simple 3 1/2 digit Walmart special. You have to switch ranges manually, but it provides a reading much faster than the other units which are all autoranging. Most of the time, I am concerned with the supply voltages. If they are correct, then CMOS and ECL logic pretty much have to have the correct swing, and you have to use a scope to see the pulses anyway. So my question to the group is what kind of things do you do that require high precision in voltage measurements? Regards, Mike Monett _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
