Re: Beyond Power Supply Safety

[emc-p...@ieee.org]

re-cycle electronic equipment.  We have events at work where we get to bring
in old electronic stuff to toss into the special bin going to the re-cycler.





From: IBM Ken 
To: oconne...@tamuracorp.com
Cc: emc-p...@ieee.org
Sent: Wednesday, October 12, 2011 8:28 PM
Subject: Re: Beyond Power Supply Safety


It's best to throw the printer(s) out.
 
If you don't have kids at home and you're going to use the printer somewhere
where fire damage is less of a concern then you could:
 
-disassemble
-flush with clean water
-dry thoroughly
-reassemble
-hipot test if you have a tester (why not?)
-set on fireproof surface and power via GFI
-check for abnormal voltages at SELV interfaces using multimeter with
insulated leads 
-function check
-place back into service
 
Then worry for the next several years about if/when the printer is going to
burn down the house...
 
Again - it's best to throw the printers out.  Maybe your homeowner's insurance
will pay for them.
 
-Ken A.


On Wed, Oct 12, 2011 at 4:43 PM, Brian Oconnell 
wrote:


It's dead, Jim

Brian

-Original Message-
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of Grace Lin
Sent: Wednesday, October 12, 2011 5:17 AM
To: emc-p...@ieee.org
Subject: Beyond Power Supply Safety


Dear Members,

How much damage would be after shorting the input of power supplies?  
An HP
all-in-one machine (purchased in 2001) and a color laser printer (HP
CP2025dn) were damaged by about 1.5 feet of flood water brought into the
house by Hurricane Irene.  They were safe (no fire and damage to the
property and human beings).  Both power cords were connected to the
receptacles (no surge protectors) which were about 1 foot above the 
ground.
The all-in-one machine, powered by an AC adapter, was on a table and 
didn't
touch water.  Some components of the laser printer burned when it had 
about
1" of flood water on the bottom.

My question is: is it worth for me, not a hardware troubleshooting 
expert,
to try to fix them?  Or, just say good bye to them and move on?

Thank you very much and look forward to your comments.

Best regards,
Grace Lin

-


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Re: Beyond Power Supply Safety

[emc-p...@ieee.org]

It's best to throw the printer(s) out.
 
If you don't have kids at home and you're going to use the printer somewhere
where fire damage is less of a concern then you could:
 
-disassemble
-flush with clean water
-dry thoroughly
-reassemble
-hipot test if you have a tester (why not?)
-set on fireproof surface and power via GFI
-check for abnormal voltages at SELV interfaces using multimeter with
insulated leads 
-function check
-place back into service
 
Then worry for the next several years about if/when the printer is going to
burn down the house...
 
Again - it's best to throw the printers out.  Maybe your homeowner's insurance
will pay for them.
 
-Ken A.


On Wed, Oct 12, 2011 at 4:43 PM, Brian Oconnell 
wrote:


It's dead, Jim

Brian

-Original Message-
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of Grace Lin
Sent: Wednesday, October 12, 2011 5:17 AM
To: emc-p...@ieee.org
Subject: Beyond Power Supply Safety


Dear Members,

How much damage would be after shorting the input of power supplies?  
An HP
all-in-one machine (purchased in 2001) and a color laser printer (HP
CP2025dn) were damaged by about 1.5 feet of flood water brought into the
house by Hurricane Irene.  They were safe (no fire and damage to the
property and human beings).  Both power cords were connected to the
receptacles (no surge protectors) which were about 1 foot above the 
ground.
The all-in-one machine, powered by an AC adapter, was on a table and 
didn't
touch water.  Some components of the laser printer burned when it had 
about
1" of flood water on the bottom.

My question is: is it worth for me, not a hardware troubleshooting 
expert,
to try to fix them?  Or, just say good bye to them and move on?

Thank you very much and look forward to your comments.

Best regards,
Grace Lin

-


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RE: [PSES] Table Size in Emissions test

[emc-p...@ieee.org]

Absolutely – and if you do not like a particular assessor, you can insist
that they not be assigned to your audit.  Give a reason though, accrediting
organizations do want to know how their assessors are doing and behaving.

Stand up for your rights in the audit process.

 

Dennis Ward 



Director of Engineering

American Certification Body 
Certification Resource for the Wireless Industry http://www.acbcert.com
703-847-4700 fax 703-847-6888 
direct - 703-880-4841

 

From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Derek Walton
Sent: Wednesday, October 12, 2011 11:30 AM
To: Bob Richards
Cc: emc-p...@ieee.org
Subject: Re: [PSES] Table Size in Emissions test

 

Hi Everyone,

It seems that there are many instances where labs disagree with findings. I
would like to stress to everyone that you dont have to accept the assessors
opinion. When you sign your report you are actually saying that.

In the case of especially trivial things like those mentioned, just have your
assessor document it, and move on. When you reply to the assessing body, state
your case and make sure you stress you believe the assessor is wrong. If the
deficiency is wishy washy, get it clarified. This way a second reviewer will
be asked to review the finding. If indeed it's not a finding, then you are
done. If you are indeed wrong, it will be explained why: and clearly.

This whole mechanism is there to stop cases where an over zealous assessor is
grasping at straws: so USE IT. There are so many preconceived notions about
assessing that are plain wrong. One of them is that you will be "punished" for
pushing back, this is not true.

My 10 cents worth..

Derek Walton


On 10/12/2011 12:29 PM, Bob Richards wrote: 

Harry, 

 

Yes, you have to pick your battles. :-)  We've done the same thing, it is
sometimes quicker to change a procedure than to argue the validity.

 

I remember an auditor not liking an ESD setup, regarding the VCP. I was
injecting on the same side of the VCP that the ground lead was attached. The
auditor stated something about the current path needs to cross the coupling
plane for it to be a valid setup. There was no wording in the standard to that
effect, but the example setup picture showed it that way. The ground lead,
IMHO, is just a bleeder circuit to bring the VCP back to 0v before the next
discharge, so it doesn't matter where it is attached. Now, in the latest
version of the standard, one of the example setups show the lead on the same
side as the ESD gun. I feel vindicated. :-)

 

Bob R.



--- On Wed, 10/12/11, Harry Ward 
  wrote:


From: Harry Ward   
Subject: Re: [PSES] Table Size in Emissions test
To: EMC-PSTC@LISTSERV.IEEE.ORG
Date: Wednesday, October 12, 2011, 1:14 PM

Hi Derek,

 

I fully agree with your sentiments. The deficiency was objected to the
accreditation body but it was quicker to satisfy the auditor's whims rather
than engage in an elongated discussion about the rights and wrongs..

Mea culpa - I never did follow up with the accreditation body - simply
because there were more pressing things to take care of and the problem was
fixed; well, until the next audit!   .

 

Regards,

 

Harry

 





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All emc-pstc posti

RE: Beyond Power Supply Safety

[emc-p...@ieee.org]

It's dead, Jim

Brian
-Original Message-
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of Grace Lin
Sent: Wednesday, October 12, 2011 5:17 AM
To: emc-p...@ieee.org
Subject: Beyond Power Supply Safety

Dear Members,

How much damage would be after shorting the input of power supplies?  An HP
all-in-one machine (purchased in 2001) and a color laser printer (HP
CP2025dn) were damaged by about 1.5 feet of flood water brought into the
house by Hurricane Irene.  They were safe (no fire and damage to the
property and human beings).  Both power cords were connected to the
receptacles (no surge protectors) which were about 1 foot above the ground.
The all-in-one machine, powered by an AC adapter, was on a table and didn't
touch water.  Some components of the laser printer burned when it had about
1" of flood water on the bottom.

My question is: is it worth for me, not a hardware troubleshooting expert,
to try to fix them?  Or, just say good bye to them and move on?

Thank you very much and look forward to your comments.

Best regards,
Grace Lin

-

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discussion list. To post a message to the list, send your e-mail to


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Scott Douglas 
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For policy questions, send mail to:
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Re: [PSES] Table Size in Emissions test

[emc-p...@ieee.org]

In message <1318445064.93913.yahoomail...@web112606.mail.gq1.yahoo.com>, 
dated Wed, 12 Oct 2011, Philo Beddo  writes:

>But don't get me started on calibration, verification, and quality 
>checks!    Because I've been told that a LISN verification falls within 
>MU while NSA does not.   In writing from an acceditation body.
>oh was that a tangent?
>Ash.

Or a cosh? (;-)
-- 
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
Some people who are peeling the finch of the financial crisis are thinking of
biting a rook.

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Re: [PSES] Table Size in Emissions test

[emc-p...@ieee.org]

All,
 
I don't think questioning an assessor is a bad thing.   Many of us in the EMC
field have as much or more experience than the assessors who visit our labs.  
Often what it comes down to is the letter of the law...we all live and die by
the word  "shall" in test standards (as was pointed out earlier).It's
healthy for the acceditation bodies to handle rebutals as long as they're not
without merit.  
 
But don't get me started on calibration, verification, and quality checks!   
Because I've been told that a LISN verification falls within MU while NSA does
not.   In writing from an acceditation body.
oh was that a tangent?
Ash.
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Re: [PSES] Table Size in Emissions test

[emc-p...@ieee.org]

Hi Everyone,

It seems that there are many instances where labs disagree with findings. I
would like to stress to everyone that you dont have to accept the assessors
opinion. When you sign your report you are actually saying that.

In the case of especially trivial things like those mentioned, just have your
assessor document it, and move on. When you reply to the assessing body, state
your case and make sure you stress you believe the assessor is wrong. If the
deficiency is wishy washy, get it clarified. This way a second reviewer will
be asked to review the finding. If indeed it's not a finding, then you are
done. If you are indeed wrong, it will be explained why: and clearly.

This whole mechanism is there to stop cases where an over zealous assessor is
grasping at straws: so USE IT. There are so many preconceived notions about
assessing that are plain wrong. One of them is that you will be "punished" for
pushing back, this is not true.

My 10 cents worth..

Derek Walton


On 10/12/2011 12:29 PM, Bob Richards wrote: 

Harry, 
 
Yes, you have to pick your battles. :-)  We've done the same thing, it is
sometimes quicker to change a procedure than to argue the validity.
 
I remember an auditor not liking an ESD setup, regarding the VCP. I was
injecting on the same side of the VCP that the ground lead was attached. The
auditor stated something about the current path needs to cross the coupling
plane for it to be a valid setup. There was no wording in the standard to that
effect, but the example setup picture showed it that way. The ground lead,
IMHO, is just a bleeder circuit to bring the VCP back to 0v before the next
discharge, so it doesn't matter where it is attached. Now, in the latest
version of the standard, one of the example setups show the lead on the same
side as the ESD gun. I feel vindicated. :-)
 
Bob R.


--- On Wed, 10/12/11, Harry Ward 
  wrote:



From: Harry Ward   
Subject: Re: [PSES] Table Size in Emissions test
To: EMC-PSTC@LISTSERV.IEEE.ORG
Date: Wednesday, October 12, 2011, 1:14 PM


Hi Derek,
 
I fully agree with your sentiments. The deficiency was objected to the
accreditation body but it was quicker to satisfy the auditor's whims rather
than engage in an elongated discussion about the rights and wrongs..
Mea culpa - I never did follow up with the accreditation body - simply
because there were more pressing things to take care of and the problem was
fixed; well, until the next audit!   .
 
Regards,
 
Harry





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Re: [PSES] Table Size in Emissions test

[emc-p...@ieee.org]

Harry, 
 
Yes, you have to pick your battles. :-)  We've done the same thing, it is
sometimes quicker to change a procedure than to argue the validity.
 
I remember an auditor not liking an ESD setup, regarding the VCP. I was
injecting on the same side of the VCP that the ground lead was attached. The
auditor stated something about the current path needs to cross the coupling
plane for it to be a valid setup. There was no wording in the standard to that
effect, but the example setup picture showed it that way. The ground lead,
IMHO, is just a bleeder circuit to bring the VCP back to 0v before the next
discharge, so it doesn't matter where it is attached. Now, in the latest
version of the standard, one of the example setups show the lead on the same
side as the ESD gun. I feel vindicated. :-)
 
Bob R.


--- On Wed, 10/12/11, Harry Ward  wrote:



From: Harry Ward 
Subject: Re: [PSES] Table Size in Emissions test
To: EMC-PSTC@LISTSERV.IEEE.ORG
Date: Wednesday, October 12, 2011, 1:14 PM


Hi Derek,
 
I fully agree with your sentiments. The deficiency was objected to the
accreditation body but it was quicker to satisfy the auditor's whims rather
than engage in an elongated discussion about the rights and wrongs..
Mea culpa - I never did follow up with the accreditation body - simply
because there were more pressing things to take care of and the problem was
fixed; well, until the next audit!   .
 
Regards,
 
Harry





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RE: Beyond Power Supply Safety

[emc-p...@ieee.org]

Grace I would say replace everything. I am a hardware type. For years I have
fixed every broken piece of my hardware. Today I find the cost of repair parts
to very quickly exceed the total cost of the machine. In part, that’s
because the replaceable parts are usually large modules. Power supplies are
often glued together so you have to cut into them to replace component parts.
Sadly we are a throwaway society.

 

I think printers are a unique case. Have you noticed the printer repair stores
are going out of business? Again in part, because the manufactures practically
give away the hardware and make their money on the expendables. 

 

Fred Townsend

DC to Light Consulting Services

 

From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Grace Lin
Sent: Wednesday, October 12, 2011 5:17 AM
To: emc-p...@ieee.org
Subject: Beyond Power Supply Safety

 

Dear Members,

 

How much damage would be after shorting the input of power supplies?  An HP
all-in-one machine (purchased in 2001) and a color laser printer (HP CP2025dn)
were damaged by about 1.5 feet of flood water brought into the house by
Hurricane Irene.  They were safe (no fire and damage to the property and human
beings).  Both power cords were connected to the receptacles (no surge
protectors) which were about 1 foot above the ground.  The all-in-one machine,
powered by an AC adapter, was on a table and didn't touch water.  Some
components of the laser printer burned when it had about 1" of flood water on
the bottom.

 

My question is: is it worth for me, not a hardware troubleshooting expert, to
try to fix them?  Or, just say good bye to them and move on?

 

Thank you very much and look forward to your comments.

 

Best regards,

Grace Lin  

-

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Mike Cantwell  

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RE: [PSES] Table Size in Emissions test

[emc-p...@ieee.org]

I also had similar issues during audits. I was able to argue that it is 
impossible to have anything that is EXACTLY any dimension. At issue was the 
height above the ground plane for a 61000-4-6 conducted immunity test. I was 
able to back it up by finding precedence in the 61000-4-4 EFT standard stating 
the 10cm height +/- 10%. I'm sure there are some auditors that would not budge, 
though.
 
I like the quote "EMC testing is like measuring Jello with a micrometer".
 
Bob R.
  

--- On Wed, 10/12/11, Harry Ward  wrote:



From: Harry Ward 
Subject: RE: [PSES] Table Size in Emissions test
To: EMC-PSTC@LISTSERV.IEEE.ORG
Date: Wednesday, October 12, 2011, 12:00 PM



Interesting thread……….

 

Several years ago I had a similar issue:

 

The table height was measured by (a well-respected) auditor and deemed 
to be 79.5cm, not 80cm. Several discussions followed regarding the 
accuracy/traceability of the auditor’s tape measure, validity of the deficiency 
etc.

 

Initially I rejected the  deficiency but after time just added a 0.5cm 
board to the table. When in business to make money it’s often easier and 
quicker to fix the perceived problem than to argue against it.

 

Harry 
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Re: [PSES] Table Size in Emissions test

[emc-p...@ieee.org]

Hi Derek,
 
I fully agree with your sentiments. The deficiency was objected to the 
accreditation body but it was quicker to satisfy the auditor's whims rather 
than engage in an elongated discussion about the rights and wrongs..
Mea culpa - I never did follow up with the accreditation body - simply because 
there were more pressing things to take care of and the problem was fixed; 
well, until the next audit!   .
 
Regards,
 
Harry



From: Derek Walton 
To: EMC-PSTC@LISTSERV.IEEE.ORG
Sent: Wed, October 12, 2011 11:23:32 AM
Subject: Re: [PSES] Table Size in Emissions test


Harry,

alas what you say is true, but not the way it should be.

It should never have been a deficiency...

I am greatly opposed to this nonsense.

I do wish more labs would make instances like this known to their assessing 
bodies..

Cheers,

Derek.

On 10/12/2011 11:00 AM, Harry Ward wrote: 

Interesting thread……….

 

Several years ago I had a similar issue:

 

The table height was measured by (a well-respected) auditor and deemed 
to be 79.5cm, not 80cm. Several discussions followed regarding the 
accuracy/traceability of the auditor’s tape measure, validity of the deficiency 
etc.

 

Initially I rejected the  deficiency but after time just added a 0.5cm 
board to the table. When in business to make money it’s often easier and 
quicker to fix the perceived problem than to argue against it.

 

Harry 

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Re: [PSES] Table Size in Emissions test

[emc-p...@ieee.org]

Harry,

alas what you say is true, but not the way it should be.

It should never have been a deficiency...

I am greatly opposed to this nonsense.

I do wish more labs would make instances like this known to their assessing 
bodies..

Cheers,

Derek.

On 10/12/2011 11:00 AM, Harry Ward wrote: 

Interesting thread……….

 

Several years ago I had a similar issue:

 

The table height was measured by (a well-respected) auditor and deemed 
to be 79.5cm, not 80cm. Several discussions followed regarding the 
accuracy/traceability of the auditor’s tape measure, validity of the deficiency 
etc.

 

Initially I rejected the  deficiency but after time just added a 0.5cm 
board to the table. When in business to make money it’s often easier and 
quicker to fix the perceived problem than to argue against it.

 

Harry 

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Re: [PSES] Table Size in Emissions test

[emc-p...@ieee.org]

That was absolutely the correct course to take as long as there were more
profitable venues to pursue.

But long term, such events are sand in the gears, and they will wear things
down if not properly addressed. 
 
Ken Javor

Phone: (256) 650-5261





From: Harry Ward 
List-Post: emc-pstc@listserv.ieee.org
Date: Wed, 12 Oct 2011 09:00:43 -0700 (PDT)
To: 
Subject: RE: [PSES] Table Size in Emissions test

Interesting thread……….
 
Several years ago I had a similar issue:
 
The table height was measured by (a well-respected) auditor and deemed to be
79.5cm, not 80cm. Several discussions followed regarding the
accuracy/traceability of the auditor’s tape measure, validity of the
deficiency etc.

Initially I rejected the  deficiency but after time just added a 0.5cm board
to the table. When in business to make money it’s often easier and quicker
to fix the perceived problem than to argue against it.
 
Harry 
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RE: [PSES] Table Size in Emissions test

[emc-p...@ieee.org]

Interesting thread……….

 

Several years ago I had a similar issue:

 

The table height was measured by (a well-respected) auditor and deemed to be 
79.5cm, not 80cm. Several discussions followed regarding the 
accuracy/traceability of the auditor’s tape measure, validity of the deficiency 
etc.

 

Initially I rejected the  deficiency but after time just added a 0.5cm board to 
the table. When in business to make money it’s often easier and quicker to fix 
the perceived problem than to argue against it.

 

Harry 

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RE: Beyond Power Supply Safety

[emc-p...@ieee.org]

Hello Grace,

 

I would recommend replacing line voltage supplies that have been flooded.  The
water can carry conductive contaminants.  You can also get water penetrating
into components causing potential problems.  There is less risk for SELV
circuits, but that doesn’t mean that there is no risk.  There may be enough
energy available in circuits such that a low impedance fault could cause
problems.  In general, I would recommend replacing flooded electronics.

 

A larger concern can be the building wiring.  Nonmetallic sheathed cable, such
as Romex®, does not handle water well.  Water can enter the cable and rot it
>from the inside out.  Water and contaminants can also get stuck in electrical
receptacles.  If the receptacles and wiring are below the water line from the
flood, they will need to be checked carefully.  It is likely that the wiring
will need to be replaced.

 

UL has guidance on handling flooded electronics on this page.

http://www.ul.com/global/eng/pages/offe
ings/perspectives/regulator/electrical/additionalresources/flooding/

 

Regards,

Ted Eckert

Compliance Engineer

Microsoft Corporation

ted.eck...@microsoft.com

 

The opinions expressed are my own and do not necessarily reflect those of my
employer.

 

From: Grace Lin [mailto:graceli...@gmail.com] 
Sent: Wednesday, October 12, 2011 5:17 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Beyond Power Supply Safety

 

Dear Members,

 

How much damage would be after shorting the input of power supplies?  An HP
all-in-one machine (purchased in 2001) and a color laser printer (HP CP2025dn)
were damaged by about 1.5 feet of flood water brought into the house by
Hurricane Irene.  They were safe (no fire and damage to the property and human
beings).  Both power cords were connected to the receptacles (no surge
protectors) which were about 1 foot above the ground.  The all-in-one machine,
powered by an AC adapter, was on a table and didn't touch water.  Some
components of the laser printer burned when it had about 1" of flood water on
the bottom.

 

My question is: is it worth for me, not a hardware troubleshooting expert, to
try to fix them?  Or, just say good bye to them and move on?

 

Thank you very much and look forward to your comments.

 

Best regards,

Grace Lin  

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Re: [PSES] CE Mark with exclamation mark

[emc-p...@ieee.org]

Also, note subclause 22 of the ERO RTTE site.
http://www.ero.dk/rtte


On Wed, Oct 5, 2011 at 4:07 PM, Aldous, Scott  wrote:


Here is the guidance doc for the R&TTE Directive:

http://ec.europa.eu/enterprise/sectors/rtte/files/guide2009-04-20_en.pdf

Section 6.5 goes over marking, and 6.5.1 shows the CE with the Notified 
Body
identification number and the class identifier (alert sign). Section 4.2 has
specific information on classes.

Scott Aldous
Compliance Engineer
Solar Energy

  +1.970.492.2065 Direct
 +1.970.214.9427 Mobile
  +1.970.407.5872 Fax
  +1.541.312.3832 Main
scott.ald...@aei.com


1625 Sharp Point Drive
Fort Collins, CO 80525

www.advanced-energy.com/solarenergy




-Original Message-
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of
lauren_cr...@amat.com
Sent: Wednesday, October 05, 2011 2:03 PM
To: oconne...@tamuracorp.com; EMC-PSTC@LISTSERV.IEEE.ORG
Subject: RE: CE Mark with exclamation mark

Keep in mind there is also an bold-exclamation-mark-inside-a-bold-circle
known as the "alert" mark of the RTTE (Radio and Telecommunications Terminal
Equipment) Directive. I believe it is supposed to be used for "class II" radio
transmitters. I am probably mistaken when I guess that class II transmitters
use frequencies that have not been harmonized across all EU Member States yet.
 I suggest looking for a guidance document on the EU Commission website.

Regards,
--
Lauren Crane (mr.)
Product Regulatory Analyst | Corporate Product EHS | Applied Materials
Office 512.272.6540 | Mobile 512.736.7201 | America - Europe - Asia

- External Use – The opinions expressed here are my own opinions only 
and
not necessarily those of my employer.

** Save paper and trees! Please consider the environment before 
printing this
e-mail.



-Original Message-
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Brian 
Oconnell
Sent: Wednesday, October 05, 2011 2:43 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: RE: CE Mark with exclamation mark

The '!' notation is typically used within triangle (ISO symbol 0434) to
indicate that there is something important that the operator needs to read
about; or that it is being used to indicate special components on a PCB.

Is a stand-alone '!' being proposed? Did they refer to a symbol out of
IEC60417 or ISO7000? Would really like to know the reference for this.

Brian


-Original Message-
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of 
Christopher
Sent: Wednesday, October 05, 2011 12:05 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: CE Mark with exclamation mark

Folks,

I have a question

Our overseas test lab suggested to add “exclamation mark" behind CE mark
because it’s related to RF 2.4GHz products to meet CE requirement Is it
necessary? Our AP product is a 80211 a/b/g/n with DFS

Christopher

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Beyond Power Supply Safety

[emc-p...@ieee.org]

Dear Members,
 
How much damage would be after shorting the input of power supplies?  An HP
all-in-one machine (purchased in 2001) and a color laser printer (HP CP2025dn)
were damaged by about 1.5 feet of flood water brought into the house by
Hurricane Irene.  They were safe (no fire and damage to the property and human
beings).  Both power cords were connected to the receptacles (no surge
protectors) which were about 1 foot above the ground.  The all-in-one machine,
powered by an AC adapter, was on a table and didn't touch water.  Some
components of the laser printer burned when it had about 1" of flood water on
the bottom.
 
My question is: is it worth for me, not a hardware troubleshooting expert, to
try to fix them?  Or, just say good bye to them and move on?
 
Thank you very much and look forward to your comments.
 
Best regards,
Grace Lin  
-

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Verification for Immunity tests

[emc-p...@ieee.org]

Dear Experts,

It is required by ISO17025 to carry out verifications of the test
stations/equipments at predefined regular intervals. 

What is the minimum acceptable verifications for ESD, EFT, Surge and CI
stations? I am reluctant to purchase ESD targets, 50/1000 ohm attenuators,
differential HV probes, etc. Besides having to spend money, time is also a
critical factor. 

Sent from Wendy.Nya iPhone

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