Yeah! In spades. And there really are no good substitutes. I have a number of instruments from ESI, GR and others that are pretty much doorstops w/o them.
The solution the camera people use, the silver cells, are not available in the larger sizes for instruments AFAIK. -John =============== > But Hg batteries are So Moot! We're simply not allowed to have them or > make them. Nanny won't have them in the house. > I have a couple of Accutron clocks that would love to see a mercury cell. > > ed breya >> Second attempt at emailing again: >> >> NiCd batteries should have the lowest noise for their size due to low >> resistance, but if you look at ever-lower frequency, the Hg should be >> superior since it has the most stable voltage with time and >> temperature. Drift (including self-discharge) and temperature >> variation response can appear as very low frequency noise independent >> of the other noise sources and operating conditions. Hg batteries are >> so stable that they were commonly used as voltage references or to >> power small circuits without any additional regulation needed. >> >> Ed >> >> >> >> >Mike Feher wrote: >> >> A long time ago, when I was concerned about a phase noise issue, I found >> an >> old NBS article. It was on measuring phase noise and included a >> schematic of >> an ultra-low noise amplifier. In that amplifier they used Mercury >> batteries. >> I also glanced at the referenced article, stating NiCad is the lowest >> noise, >> and, NiCads were available for a long time, yet they used Mercury. >> Regards >> - Mike >> > >> >> >> >> >> >> >> >> >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > > > -- > "Neither the voice of authority nor the weight of reason and argument > are as significant as experiment, for thence comes quiet to the mind." > De Erroribus Medicorum, R. Bacon, 13th century. > "If you don't know what it is, don't poke it." > Ghost in the Shell > > > Dr. Don Latham AJ7LL > Six Mile Systems LLP > 17850 Six Mile Road > POB 134 > Huson, MT, 59846 > VOX 406-626-4304 > Skype: buffler2 > www.lightningforensics.com > www.sixmilesystems.com > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.