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

Robert Atkinson robert.atkinson at genetix.com
Tue Jul 18 07:14:02 UTC 2006


Hi all,
Yes some T&E is exempt. Not all batteries are, mercury cells were banned
about 10 years ago. This was a great pity as they make great voltage
references!
Hg is allowed in lamps, lead in ceramics and Cd in light dependant
resistors.
I don't know who will enforce it, I can't see trading standards
wandering around with an X-ray fluorescence tester! EMC has been around
for a while and there are lots of non-compliant items for sale. Some are
obviously non-compliant others fail under test. We make laboratory
automation equipment that uses PC's for control, We take a unit for
testing and it fails because of the PC. One failed with the PC running
with just the power lead connected, no keyboard, mouse or monitor. The
supplier said it was compliant because all the parts we CE marked!

Sorry for the rant, but I feel better now.

Robert G8RPI.


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of SAIDJACK at aol.com
Sent: 18 July 2006 01:16
To: time-nuts at febo.com
Subject: Re: [time-nuts] New frequency standard, Mercury better than
Cesium?

Hi Chuck,
 
yes, all test equipment is excempt from RoHS, until between 2009 -
2011. 
Europe is not sure how long they will keep this exemption in  effect.
 
There are so many legacy products that are vital to the industry and
that  
will not be re-designed that I think the exemptions will continue beyond
that.
 
Doing Lead-free has many reliability issues, let me just mention shorts

caused by tin-whiskers, and the problems of visually identifying a
cold-solder  
joint... The assembly houses I have talked to hate doing lead free work
for  
critical, expensive items.
 
How much test equipment ends in a land fill? Probably not too much due
to  
all of the gold used in it, the collectors' value etc.
 
Also, who is going to test all the products for compliance? It's
probably  
very easy to get away with not complying. I would guess this will happen
to a  
lot of products made in China...
 
bye,
Said
 
 
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