[time-nuts] New frequency standard, Mercury better than Cesium?

Chuck Harris cfharris at erols.com
Mon Jul 17 19:09:00 EDT 2006


Poul-Henning Kamp wrote:
> In message <20060717203222.78738.qmail at web50709.mail.yahoo.com>, Normand Martel
>  writes:
> 
>> They should be able.... the standard uses a single
>> mercury atom!! ;-)
> 
> Which interestingly enough might make them incompatible
> with the RoHS (Reduction of Harmfull Substances) regulation
> here in EU.
> 
> As far as I've understood RoHS, you can get away with trace amounts
> of heavy metals on the banned list, under a theory of environmental
> contamination, but if you include them deliberately, you're in
> violation.
> 
> Fortunately metrological equipment is easy to get an excemption for :-)

Actually, as I understand it, all test equipment is exempt from RoHS.  As are
all batteries, oddly enough.

-Chuck Harris



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