url: http://escribe.com/health/thesilverlist/m61942.html
Re: CS>SilverGen specs.
From: Ode Coyote
Date: Wed, 13 Aug 2003 11:38:29
[...]
> Also, I have lab tests that say that that 24 PPM is actually 45.5
> PPM and other results that say it's 20 PPM. I just don't know who
> to believe , so, I go with "my" PWT and Trems fudge factor just so
> we're all on the same page. We need some sort of standard just to
> communicate...even if it's wrong?
> It's not so much 'care' as it is caution. The bold FACT is, I
> don't know and have no way to find out when everyone else claims
> to know but can't agree.
This is very similar to the way the hard disk industry was way back
in the beginning. There were no standards, and we didn't understand
all the factors that affected the performance.
Since the disk packs were interchangeable in those days, some would
work and some wouldn't. All the parameters were interrelated. If you
changed one, all the rest would change. It was a nightmare.
Fortunately, I found a way to measure the readback amplitude
accurately in the presence of noise, and to measure the distribution
of bits in the data recovery window. This separated the various
factors into their individual components. Then we could work on
improving each one separately. The disk industry has moved on to
better encoding schemes such as PRML, but a lot of the basic
fundamentals still apply.
Making cs seems to be in a similar state. There are so many claims
and counterclaims, and so many different ways to make cs, and nobody
really knows how it works in the body. No wonder newbies have a
tough time figuring out what's going on!
Fortunately, the 5 to 10 ppm you get from the 3 nines seems to work
well on bacteria. So just about anything will give good results for
most users.
> The problems I had with the PWTs had to do with Hannas
> incompetence in packaging calibration solutions. The meters
> themselves are very good as far as they go and for what they do
> while we mis-apply them. I had no problems with Trem.
> Hanna is obtuse and gives everyone the run around [including Trem]
> before admitting an obvious error. It just took both of us yelling
> to move Hanna...and some small amount of effort to get past Trems
> faith in Hanna.
Have you had time to try making your own standard using salt using
the data in Steve's post?
http://escribe.com/health/thesilverlist/m60245.html
[...]
> Naptha does a wonderful job on flux residue...or use water base
> flux and wash well.
I still use rosin core for prototypes. Thanks for the hint on Naptha
- I'll get some and try it.
[...]
> Ode [Ken]
Best Regards,
Mike Monett
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