Re: [PSES] Organize my standards => ISBN 13 Digit code

[Brian O'Connell]

When you have bazillions of standards, the ISBN is handy as a unique identifier 
(unique and/or primary key), as each version has different reference; otherwise 
no other significant use. For example, an excerpt from my database:

ISBN 9780580910234 BS EN 62368-1:2014

ISBN 9782832214053 IEC 62368-1 Edition 2.0 2014-02

ISBN 9782889106844 IEC 62368-1 Edition 1.0 2010-01

ISBN 97811554364159 CSA C22.2 NO. 60950-1B-07

Brian


From: Chuck August-McDowell [mailto:chu...@meyersound.com] 
Sent: Friday, June 23, 2017 4:47 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] Organize my standards => ISBN 13 Digit code

Greetings form Berkeley,
 
Does using the International Standard Book Number (ISBN) 13 digit code work to 
organize your standard's collection?
 
Thank you in advance for comments,
 
Mr. Chuck McDowell
Compliance Specialist 
Meyer Sound Laboratories Inc.
 
 
 
 
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[PSES] Organize my standards => ISBN 13 Digit code

[Chuck August-McDowell]

Greetings form Berkeley,

Does using the International Standard Book Number (ISBN) 13 digit code work to 
organize your standard's collection?

Thank you in advance for comments,

Mr. Chuck McDowell
Compliance Specialist
Meyer Sound Laboratories Inc.





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Re: [PSES] USB dongle connector shield filtered grounding

[Grasso, Charles]

Hello John,

Thank you - but the other half of the water tank is not metal - it is plastic - 
a dongle after all.

I am fully aware of shielding and termination techniques - however I have not 
seen
a "filter" used to attach the connector shield to the circuit ground at the 
dongle.

I have also read that the industry convention now is to tie the shield ground
and the circuit ground at the host only and "float" the peripheral connector
using the filter combo previously stated.

Clearly (due to the lack of response) no one else has run across this either!



Thanks

Charles Grasso
(w) 303-706-5467





From: John Woodgate [mailto:jmw1...@btinternet.com]
Sent: Thursday, June 22, 2017 11:21 AM
To: Grasso, Charles ; EMC-PSTC@LISTSERV.IEEE.ORG
Subject: RE: [PSES] USB dongle connector shield filtered grounding

This message originated outside of DISH and was sent by: 
jmw1...@btinternet.com

You will find a lot of good, proven information about shield grounding for 
balanced interconnects in the Journal of the Audio Engineering Society Volume 
43 Number 6  1995 June. Don't be put off by the 'audio'; the techniques are 
valid up to 100 MHz or even higher.

Put simply, the cable shield should be regarded as a pipe connecting two water 
tanks. So connect so that it doesn't leak! Furthermore, connect the shell to 
the outside of a conducting enclosure, because connecting to the inside turns 
the cable shield into a transmitting antenna potentially filling the enclosure 
with VHF/UHF fog.

Now the question changes to 'how to connect a conducting enclosure to the 
circuit ground?' Unless the enclosure isn't conducting, of course, In that 
case, connect the shell-shield-shell chain to circuit ground at the sending 
end,  so that the cable capacitance is charged from a low-impedance source.

But that is a very brief summary. The paper by Neil Muncy explains all that and 
more, and it all works.


With best wishes DESIGN IT IN! OOO - Own Opinions Only
www.jmwa.demon.co.uk J M Woodgate and Associates 
Rayleigh England

Sylvae in aeternum manent.

From: Grasso, Charles [mailto:charles.gra...@dish.com]
Sent: 22 June 2017 17:52
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] USB dongle connector shield filtered grounding

Greetings

And just when you thought it was safe to go back in the water..!!

Q: Has this august forum heard of/seen/used a filter combo technique
to tie the connector shield to the circuit ground successfully?

# ILLUMINATION # ###
My question has to do with USB dongles and the connection of the
cable shield to circuit ground. I am running across a lot of posts
recommending NOT having a low impedance connection from the
shield to the circuit ground at the dongle connector : rather
the shield is kept separate (at least AC wise) from the circuit
ground using a ferrite/cap or resistor/cap combo.

I have also read that the industry convention now is to tie the shield ground
and the circuit ground at the host only and "float" the peripheral connector
using the filter combo previously stated.

I have not used this EMI suppression technique but I find it simultaneously 
intriguing and
counter intuitive.

Q: Has this august forum heard of/seen/used this technique successfully?


TL/DR: Found new USB grounding technique, am suspicious of it, asking for
the forums help.

TIA
* ** *

Summary of techniques can be found here:

[https://forum.allaboutcircuits.com/threads/usb-device-cable-shield-connection-grounding-it-or-not.58811/]
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All emc-pstc 

Re: [PSES] Source for HF-1 Foam Air Filter?

[Nyffenegger, Dave]

I am interested in a similar source for HF-1 or better HF-2 to use for a foam 
roller something like 6in diameter x 8iin long.  Closed cell probably preferred.

-Dave

From: Mike Sherman [mailto:msherma...@comcast.net]
Sent: Friday, June 23, 2017 8:11 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] Source for HF-1 Foam Air Filter?

I'm using HF-1 foam for an air filter. Can any of you recommend a supplier?
Replies off-line are acceptable.
Mike Sherman
Graco Inc.
Minneapolis, MN USA
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[PSES] Source for HF-1 Foam Air Filter?

[Mike Sherman]

I'm using HF-1 foam for an air filter. Can any of you recommend a supplier? 
Replies off-line are acceptable. 
Mike Sherman 
Graco Inc. 
Minneapolis, MN USA 

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