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

2006-07-18 Thread Poul-Henning Kamp
In message <[EMAIL PROTECTED]>, [EMAIL PROTECTED] writes: >How much test equipment ends in a land fill? RoHS also addresses this, the manufacturers have to take back old equipment and dispose of it properly. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [EMAIL PROTECTED] | TCP

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

2006-07-18 Thread Poul-Henning Kamp
In message <[EMAIL PROTECTED]>, Brooke Clarke writes: >Hi Chuck: > >I think it will take 4 to 6 years for the tin whiskers to grow to the >point of shorting out IC packages, relays, etc. That's already well past the lifetime of most consumer electronics. RoHS has various excemptions and T&M is i

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

2006-07-18 Thread Robert Atkinson
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 stand

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

2006-07-18 Thread Magnus Danielson
From: "Poul-Henning Kamp" <[EMAIL PROTECTED]> Subject: Re: [time-nuts] New frequency standard, Mercury better than Cesium? Date: Mon, 17 Jul 2006 22:30:30 + Message-ID: <[EMAIL PROTECTED]> > In message <[EMAIL PROTECTED]>, Normand Martel > writes: > > >They should be able the standard us

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

2006-07-18 Thread Hal Murray
> Both cesium and rubidium is harder to come by, but ebay being what it > is, it is no longer that hard if I really wanted to. I have always > wondered where one actually get these things on a commerical basis. There are companies in the business of supplying that sort of thing. You just have t

Re: [time-nuts] Hello and HP-5370A question

2006-07-18 Thread Dr. David Kirkby
Jose V. Gavila wrote: > Hello Dave, > > >>The manual I scanned was for the 5370B, not the A. >>Are you sure you are looking at the correct manual? > > > Yes, I know it is a 5370B manual... but I think there is not 'big'(*) > difference > among units I believe there is an online manual for th

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

2006-07-18 Thread John Ackermann N8UR
Poul-Henning Kamp wrote: > In message <[EMAIL PROTECTED]>, [EMAIL PROTECTED] writes: > >> How much test equipment ends in a land fill? > > RoHS also addresses this, the manufacturers have to take back > old equipment and dispose of it properly. > Actually, this is covered by a different set of

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

2006-07-18 Thread jayh6
The trick is to use a tuna can instead of a soup can and coopt one of the leftover mercury atoms from the tuna ;) jay >From: Poul-Henning Kamp <[EMAIL PROTECTED]> >Date: 2006/07/17 Mon PM 05:30:30 CDT >To: Discussion of precise time and frequency measurement >Subject: Re: [time-nuts] New frequ

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

2006-07-18 Thread jayh6
In addition to the other points made, there is also theoretical calculations. The cesium fountain travels at a known dispersion of speeds (source of error) as well as known potential error in the tuning methods, so it's possible to estimate that the new design will have a lower error without act

Re: [time-nuts] caveat emptor: eBay t&m seller warning

2006-07-18 Thread Robert Crawford
Christopher, Back in January of this year I purchased a 5061A from Test Equipment Surplus (Mr. Joon Kyong). It was defective and I sent it back, expecting a prompt refund. However, no amount of begging and pleading had any effect until I left negative feedback. He responded that very day!

[time-nuts] manual 5370A

2006-07-18 Thread Dr. Frank Stellmach
Hola Jose, Well, I have uploaded the 5370A manual of 42MB last October to David's site, and it seems to be still there: http://www.g8wrb.org/data/HP/ (circuit diagrams are stitched for plotting on A1/A0 plotter.) There's a picture on p. 252 (8-93) of this 'A' unit, 3 PCB spares

[time-nuts] eBay saga re: Test Equipment Surplus, eBay id jtsele, aka [EMAIL PROTECTED] aka Joon Kyong.

2006-07-18 Thread Christopher Hoover
Hey 'nuts -- I got my money back today less a few dollars (!?!?!) and a ~$20 PayPal fee. I neglected to say when I related the sordid tale that I had initiated an eBay dispute on the item. It had absolutely no effect. The kicker seemingly was declaring that I would proceed with criminal and ci