USB Shield Grounding

[Cook, Jack]

A question regarding the Universal Serial Bus (USB) Specification.

USB spec. 1.0 required the cable shield at the peripheral end to be DC
isolated from the chassis; ie, it could be terminated only through a
capacitor(s).  That requirement always seemed strange for a cable with a
max. length of 5 meters.  And it has caused us some trouble with EMI.

Now, if I'm reading it correctly, USB 1.1 has quietly removed that
restriction and allows the shield to be grounded to the chassis at both ends
(as it should have been from the start!).  Is this correct?

Thanks,
Jack Cook,
EMC Engineer, Xerox Corp.



-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).

Re: FCC 47 CFR Part 18

[Douglas McKean]

At 12:37 PM 8/31/99 -0600, JENKINS, JEFF wrote:
>
> Does anyone know if there are "laws" that 
> require semiconductor processing equipment 
> and other types of industrial equipment to 
> conform to FCC 47 CFR Part 18?  From time 
> to time we get inquiries about this and 
> we're wondering what is behind it.
>
>Thanks,
>
>Jeff Jenkins
>Advanced Energy Industries, Inc.

Jeff, 

Go to 

http://www.access.gpo.gov/nara/cfr/ 

The correct title of what you're asking is 
CFR Title 47, Part 18.  CFR is an acronym 
for Code of Federal Regulations. 

In other words, it IS Federal law. 

And if your equipment correlates to any of the 
criteria contained therein, then ye shall test. 

Regards, Doug

-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).

FW: job listing

[Price, Ed]

Posted for non-member Jeni Fitzpatrick (Orendorff) [jf...@microsoft.com]:
Reply as shown.






:-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-)
Ed Price
ed.pr...@cubic.com
Electromagnetic Compatibility Lab
Cubic Defense Systems
San Diego, CA.  USA
619-505-2780 (Voice)
619-505-1502 (Fax)
Military & Avionics EMC Services Is Our Specialty
Shake-Bake-Shock - Metrology - Reliability Analysis
:-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-)

> -Original Message-
> From: Jeni Fitzpatrick (Orendorff) [SMTP:jf...@microsoft.com]
> Sent: Tuesday, August 31, 1999 12:57 PM
> To:   'emc-p...@ieee.org'
> Cc:   Jeni Fitzpatrick (Orendorff)
> Subject:  job listing
> 
> 
> Title: Hardware Compliance (EMC, Safety and Regulatory) Engineer
> Job Description: Compliance engineer is responsible for EMC, Safety and
> Regulatory compliance of new  PC Input/Output devices. It is necessary for
> the Compliance engineer to (a) partners with Development engineers (EE,
> ME)
> at the early phases of development cycle to assist in design for
> regulatory,
> EMC and Safety requirements, (b) Develop  Compliance plan (includes both
> Design & Test aspects) for the projects and work with Hardware Test
> engineers to integrate this plan into the Total Design Assurance & Test
> plan
> for the project (c) Own the Compliance plan from the start to end of the
> product development cycle.
> (d)Work with the Compliance manager to develop Design guidelines, Review
> check lists,  Test procedures, Frequently used Processes as necessary,
> develop correlation and repeatability standards etc. 
> Some of the activities include but not limited to review of MRD and Specs,
> POC review , Design review, Design FMEA for Compliance, Compliance test
> plan/procedure/schedule/sampling etc and effective execution of the plan,
> Perform Test and troubleshooting as necessary, Coordinate activities with
> outside vendors and Regulatory agencies, etc.
> 
> Looking for highly motivated individual with strong Technical foundation,
> Project management and communication skill. BS in EE or Physics with at
> least 3 years experience in Information Technology Equipment
> EMC/Safety/Regulatory field with Design  or  Design Assurance/Test  focus
> is
> necessary. NARTE EMC certification, fluency in IEC/FCC/EN standards and
> international regulation will be a plus.
> 
> Email resume to: hwj...@microsoft.com  
> 
> Check out more at:  http://microsoft.com/jobs/hardware.htm
>  

-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).

EMC Job Opportunity at Nortel Networks

[Nathan Belsher]

Nortel Networks (Nortel, Northern Telecom), a global manufacturer of
telecommunications systems has an outstanding career opportunity at its
Research Triangle Park facility near Raleigh, North Carolina.  In the
Broadband Product Integrity group an opening exists in the area of EMC.

SENIOR EMC Engineer (Job# X55793)

Reporting to the manager of the Broadband Product Integrity group, this
senior level position provides EMC design guidance for new & existing high
tech products.  You will define EMC requirements for product development and
team with packaging and electrical designers to ensure EMC requirements are
met.  You will also conduct simulation activities of circuit pack layouts
and other subsystems to optimize EMC performance and generate formal EMC
test plans and reports to establish hardware integrity.

To qualify, you will need a sound electrical engineering and design
background in RF and EMC reduction techniques and immunity.  You should also
be familiar with telecom systems, EMC analysis techniques and tools (PCB and
system level), and EMC standards such FCC Part 15, FCC Part 68, EN55022, and
IEC 1000. Excellent communication and project management skills are also
required.

Nortel Networks offers excellent compensation and benefits.  For
confidential consideration, please email your resume to a...@nortel.com
   or FAX to:
Nortel Networks, Attention:  Arvind Patel at (919)-991-8724.  You may also
mail to:   P. O. Box 13478, Research Triangle Park, NC. 27709.

All applicants' submittals are appreciated but only those selected for an
interview
will be contacted.

Nortel Networks is an equal opportunity/affirmative action employer proud to
maintain a drug and smoke free workplace.

Posted by
Nathan Belsher
NORTEL NETWORKS
Senior EMC Engineer
Phone:  (919)-991-2769   ESN:351-2769
FAX: (919)-991-8724
E-Mail:  nbels...@nortelnetworks.com

-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
j...@gwmail.monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).



-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).

RE: FCC 47 CFR Part 18

[Price, Ed]

Jeff:

Umm, I don't think I understand you. Title 47 of the Code of Federal
Regulations (CFR) IS the law. If your product meets the criteria for being
an electronic device, and you sell it into a USA industrial environment,
then you need to comply with Part 18.

Ed


:-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-)
Ed Price
ed.pr...@cubic.com
Electromagnetic Compatibility Lab
Cubic Defense Systems
San Diego, CA.  USA
619-505-2780 (Voice)
619-505-1502 (Fax)
Military & Avionics EMC Services Is Our Specialty
Shake-Bake-Shock - Metrology - Reliability Analysis
:-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-)

> -Original Message-
> From: JENKINS, JEFF [SMTP:jeff.jenk...@aei.com]
> Sent: Tuesday, August 31, 1999 11:37 AM
> To:   'emc-pstc'
> Subject:  FCC 47 CFR Part 18
> 
> 
> Does anyone know if there are "laws" that require semiconductor processing
> equipment and other types of industrial equipment to conform to FCC 47 CFR
> Part 18?  From time to time we get inquiries about this and we're
> wondering
> what is behind it.
> 
> Thanks,
> 
> Jeff Jenkins
> Advanced Energy Industries, Inc.
> 
> -
> This message is coming from the emc-pstc discussion list.
> To cancel your subscription, send mail to majord...@ieee.org
> with the single line: "unsubscribe emc-pstc" (without the
> quotes).  For help, send mail to ed.pr...@cubic.com,
> jim_bac...@monarch.com, ri...@sdd.hp.com, or
> roger.volgst...@compaq.com (the list administrators).
> 

-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).

FCC 47 CFR Part 18

[JENKINS, JEFF]

Does anyone know if there are "laws" that require semiconductor processing
equipment and other types of industrial equipment to conform to FCC 47 CFR
Part 18?  From time to time we get inquiries about this and we're wondering
what is behind it.

Thanks,

Jeff Jenkins
Advanced Energy Industries, Inc.

-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).

Multiple Paul Smiths Re: US Circuit breaker requirements

[Paul J Smith]

Paul,

If you get any replies for a Paul Smith at Teradyne would you please forward
them to my email address at -

paul.j.sm...@teradyne.com

Since we are both going to be on this bulletin board, I will try to be sure that
I close with my Teradyne Boston location.

Best Regards,
Paul J Smith
   Teradyne, Inc., Boston
   paul.j.sm...@teradyne.com
   Voice 617-422-2997
   FAX 603-843-7526






"Paul Smith"  on 08/31/99 08:56:06 AM

Please respond to "Paul Smith" 

To:   emc-p...@majordomo.ieee.org
cc:(bcc: Paul J Smith/Bos/Teradyne)
Subject:  US Circuit breaker requirements





Could somebody dispel an 'urban myth' for me.
UL 891 states that circuit breakers in Dead Front Switchboards shall be placed
no higher than 6 1/2 foot (2 metres) from the base of the rack they are
installed in. Thats fine and I can find the references fine in the UL
specification.

But, I am told that they can be placed no lower than 6 inches (or possibly even
18 inches) above the base of the rack they are installed in. This is the 'myth'
I need some information on. I've read UL 891 but haven't found any reference to
this matter in it (or if I did my brain was switched off at that point). What is
the requirement for the minimum mounting height for circuit breakers in Dead
Front Switchboards? Is it covered by UL891, or is it hiding in the NEC
regulations?

Any ideas?

Paul


Excite -- Control Yourself.
This E-mail brought to you by Excite's free E-mail service.
Get your own E-mail address at http://www.excite.co.uk

-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).









-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).

Outdoor passive speakers

[Rick Loiselle]

Hi,

This discussion group has been very helpful.  I have learned very much just
being on the sidelines.  

I have a question I hope someone can answer:

I need to find out what Product Safety requirements exist for Outdoor
"passive" loudspeakers.  These are 125W speakers, considered "passive"
devices, and need to withstand outdoor climate conditions (humidity,
temperature, splash treatment, marking etc.) for a worldwide market.

We usually test our "powered" Audio products to UL6500/EN60065/IEC60065 and
there are references in these standards.  However, I need to understand what
Product Safety standards apply to "passive" speakers.  Anyone have any
experience in this area?

Best Regards,
Rick

"hard anodized" process to insulate metal chassis parts

[Paul J Smith]

Good afternoon,

Does anyone know of a process of "Hard Anodized"  metal chassis parts that is
considered an acceptable insulator against hazardous voltages by any agency. The
related spec describing this process is MIL- A-8625F.

Please advise at your earliest convenience.   Thanks


Best Regards,
Paul J Smith
   Teradyne, Inc., Boston
   paul.j.sm...@teradyne.com
   Voice 617-422-2997
   FAX 603-843-7526




-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).

RE: US Circuit breaker requirements

[Russell, Ray]

Hi Paul,

I could not put my finger on the paragraph that spells it out in the NEC,
(380-4 has the 6 1/2 foot requirement) but I just installed a switch myself
and the local inspector required it to be a min of 18" off of the ground.

Ray

ray_russ...@gastmfg.com

-Original Message-
From: Paul Smith [mailto:phsm...@excite.co.uk]
Sent: Tuesday, August 31, 1999 8:56 AM
To: emc-p...@majordomo.ieee.org
Subject: US Circuit breaker requirements



Could somebody dispel an 'urban myth' for me.
UL 891 states that circuit breakers in Dead Front Switchboards shall be
placed no higher than 6 1/2 foot (2 metres) from the base of the rack they
are installed in. Thats fine and I can find the references fine in the UL
specification.

But, I am told that they can be placed no lower than 6 inches (or possibly
even 18 inches) above the base of the rack they are installed in. This is
the 'myth' I need some information on. I've read UL 891 but haven't found
any reference to this matter in it (or if I did my brain was switched off at
that point). What is the requirement for the minimum mounting height for
circuit breakers in Dead Front Switchboards? Is it covered by UL891, or is
it hiding in the NEC regulations?

Any ideas?

Paul


Excite -- Control Yourself.
This E-mail brought to you by Excite's free E-mail service.
Get your own E-mail address at http://www.excite.co.uk

-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).


-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).

FW: OATS Rework Results

[UMBDENSTOCK, DON]

The flux used was

"Indalloy Flux # 2", made by 

Indium Corporation of America
1676 Lincoln Ave
PO Box 269, Utica, NY, USA
13503

Phone: 315-853-4900

There may be better solder to use, but we just used 60/40 resin core solder.
The resin did not seem to create a problem with the Indalloy flux.  The
fumes however are really nasty.  We set up a box fan and stayed up wind of
the smoke.  The breeze did not affect the heating capability of the 500 W
iron.

The manufacturer can probably provide further advice regarding compatibility
of materials.

Don Umbdenstock
Sensormatic

> --
> From: valer...@aol.com[SMTP:valer...@aol.com]
> Sent: Monday, August 30, 1999 6:21 PM
> To:   umbdenst...@sensormatic.com
> Subject:  Re: OATS Rework Results
> 
> Don:
> 
> I read your OATS Rework Info with great interest.  I do not have anything 
> further to contribute to your problem. One thing that I found very 
> interesting was the soldering materials that your tech located for
> stainless 
> steel.  Could you possibly provide the manufacturer and pertinent info 
> regarding this?  This is the type of information I would like to file away
> 
> for future use! Thanks --
> 
> Val L. Erwin, NCE
> Consultant
> Summit Associates, Inc.
> 

-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).

US Circuit breaker requirements

[Paul Smith]

Could somebody dispel an 'urban myth' for me.
UL 891 states that circuit breakers in Dead Front Switchboards shall be placed 
no higher than 6 1/2 foot (2 metres) from the base of the rack they are 
installed in. Thats fine and I can find the references fine in the UL 
specification.

But, I am told that they can be placed no lower than 6 inches (or possibly even 
18 inches) above the base of the rack they are installed in. This is the 'myth' 
I need some information on. I've read UL 891 but haven't found any reference to 
this matter in it (or if I did my brain was switched off at that point). What 
is the requirement for the minimum mounting height for circuit breakers in Dead 
Front Switchboards? Is it covered by UL891, or is it hiding in the NEC 
regulations?

Any ideas?

Paul


Excite -- Control Yourself.
This E-mail brought to you by Excite's free E-mail service.
Get your own E-mail address at http://www.excite.co.uk

-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: "unsubscribe emc-pstc" (without the
quotes).  For help, send mail to ed.pr...@cubic.com,
jim_bac...@monarch.com, ri...@sdd.hp.com, or
roger.volgst...@compaq.com (the list administrators).