I'd guess that NiMH cells would be similar to Nicads. Cadmium has been banned in the EU, except where it is essential. The power tool manufacturers successfully negotiated an exemption, so they are still available. I did note that the paper only considered Johnson and shot noise. The very low frequency noise caused by electrochemical / electrolyte movement was not addressed.
Robert G8RPI. ________________________________ From: David Kirkby <[email protected]> To: Discussion of precise time and frequency measurement <[email protected]> Sent: Thursday, 11 July 2013, 15:25 Subject: Re: [time-nuts] Lead acid battery noise levels On 11 July 2013 05:47, Mark Spencer <[email protected]> wrote: > Eric: > > http://tf.nist.gov/general/pdf/1133.pdf > > discusses the noise levels of various batteries. > > Regards > Mark S Sod's Law comes into play here. From a quick read of that, it seems NiCd are best, but they are being phased out. I was told they were banned in Europe, but I don't know if that is true. I'm pretty sure I've seen NiCd tools in the local DIY store, so I doubt it is true. Dave _______________________________________________ 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. _______________________________________________ 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.
