[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
More information about the time-nuts
mailing list