Re: [PSES] DC Supply

[Brian Oconnell]

LM317 not good for much over 1A, is noisy under 100mA, and should probably
not be used unless next to load. The band-gap ref is a hoot if you can live
with its weirdness such as osc at some temps, poor response to load cap, and
the Zout is varies very much with load changes. I suppose this is true for
all 3-terminal regs. LM723 may require a little more work, but they are more
apt to behave and not cause problems. Probably better off with a ref, an op
amp, and base drive for some 3055s as series-pass.

Another trick for linear reg noise is the 'noise shunt'.

This thread brings back many memories...

Brian

-Original Message-
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of Ted Eckert
Sent: Friday, November 18, 2011 10:54 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: RE: DC Supply

If you can't find anything, look at application notes for the LM317
adjustable regulator. There are plenty of designs out there for adjustable
linear power supplies. It will be quite inefficient, but you don't need to
meet energy efficiency regulations if you are just building something for
in-house testing.
 
You might consider looking at electronics surplus stores. They may have some
old linear adjustable supplies available.
 
Ted Eckert
Compliance Engineer
Microsoft Corporation
ted.eck...@microsoft.com

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Re: [PSES] DC Supply

[Brian Oconnell]

1. Linear source with a slow control loop does not add anything measurable
to my ambient levels.

2. big lead-acid battery.

3. basket of lemons or potatoes.

Brian

-Original Message-
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of
rehel...@mmm.com
Sent: Friday, November 18, 2011 9:12 AM
To: emc-p...@ieee.org
Subject: DC Supply

Anybody using/knowing of a clean DC power supply (up to 50 volts, 5 amps)?
Something that won't show up in radiated or conducted scans. We have one on
a LISN but would prefer not to do that.

Bob Heller
Tel: 651-778-6336
Fax: 651-778-6252

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Re: [PSES] DC Supply

[Ted Eckert]

If you can't find anything, look at application notes for the LM317 adjustable 
regulator. There are plenty of designs out there for adjustable linear power 
supplies. It will be quite inefficient, but you don't need to meet energy 
efficiency regulations if you are just building something for in-house testing.

You might consider looking at electronics surplus stores. They may have some 
old linear adjustable supplies available.

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: ralph.mcdiar...@schneider-electric.com 
[mailto:ralph.mcdiar...@schneider-electric.com]
Sent: Friday, November 18, 2011 9:42 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: DC Supply


How about four 12V car batteries in series with a fuse and battery charger 
handy.
_

Ralph McDiarmid  |   Schneider Electric   |  Renewable Energies Business  |   
CANADA  |   Regulatory Compliance Engineering


From:

Robert Heller mailto:rehel...@mmm.com>>

To:

EMC-PSTC@LISTSERV.IEEE.ORG

Date:

11/18/2011 09:12 AM

Subject:

[PSES] DC Supply






Anybody using/knowing of a clean DC power supply (up to 50 volts, 5 amps)? 
Something that won't show up in radiated or conducted scans. We have one on a 
LISN but would prefer not to do that.

Bob Heller
Tel: 651-778-6336
Fax: 651-778-6252

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mailto:emc-p...@ieee.org>>

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[PSES] EMC Compliance Engineer Career Opening

[Chuck McDowell]

Meyer Sound in Berkeley California has a Career Opening for a EMC Compliance 
Engineer.

Short list of requirements:
Must be able to understand and operate EMI/EMC test laboratory equipment, 
troubleshoot when testing.
PCB layout experience is a must (using Altium preferred), preferably digital 
layout, grounding, and I/O
layout. Layout of class-D amplifier experience a plus.

Read the full position posting at:

http://meyersound.com/about/careers/?id=258


How to Apply

Email your cover letter and resume to 
h...@meyersound.com. Please put the title of the 
position for which you are applying as the "EMC Compliance Engineer " of the 
email.

Fax your resume and cover letter to 510 486.8356. Please put the title EMC 
Compliance Engineer on the Fax.

Mail your resume and cover letter to:
EMC Compliance Engineer
2832 San Pablo Avenue
Berkeley, California 94702
Attn: Human Resources

Please, no calls!

Respectfully yours,

Chuck McDowell
Meyer Sound Laboratories Inc.

NOTICE: This email may contain confidential information.  Please see 
http://www.meyersound.com/confidential/ for our complete policy.

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Re: [PSES] DC Supply

[Ralph . McDiarmid]

How about four 12V car batteries in series with a fuse and battery charger 
handy.
_
 


Ralph McDiarmid  |   Schneider Electric   |  Renewable Energies Business | 
  CANADA  |   Regulatory Compliance Engineering




From:
Robert Heller 
To:
EMC-PSTC@LISTSERV.IEEE.ORG
Date:
11/18/2011 09:12 AM
Subject:
[PSES] DC Supply



Anybody using/knowing of a clean DC power supply (up to 50 volts, 5 amps)? 
Something that won't show up in radiated or conducted scans. We have one 
on a LISN but would prefer not to do that. 

Bob Heller
Tel: 651-778-6336
Fax: 651-778-6252

-

This message is from the IEEE Product Safety Engineering Society emc-pstc 
discussion list. To post a message to the list, send your e-mail to <
emc-p...@ieee.org>

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URL. 
Website: http://www.ieee-pses.org/
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List rules: http://www.ieee-pses.org/listrules.html 
For help, send mail to the list administrators:
Scott Douglas 
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For policy questions, send mail to:
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[PSES] DC Supply

[Robert Heller]

Anybody using/knowing of a clean DC power supply (up to 50 volts, 5 amps)? 
Something that won't show up in radiated or conducted scans. We have one 
on a LISN but would prefer not to do that.

Bob Heller
Tel: 651-778-6336
Fax: 651-778-6252


-

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Re: [PSES] CE Requirements for Parts Washers & Sand Blast Cabinets

[Nick Williams]

Brian,

EMC will likely be the least of your problems. 

Parts washers may well be in the scope of the Machinery Directive rather than 
the LVD. Additionally, if the manufacturer does not prohibit their use with 
flammable solvents then they will be ATEX equipment (and will probably require 
Notified Body approval).

Sand blast cabinets may be none, one or several of machinery, pressure 
equipment or simple pressure vessels, and there could also be a PPE (personal 
protective equipment) angle. 

Feel free to contact me directly if you need more detailed help. 

Nick. 



On 18 Nov 2011, at 13:54, Kunde, Brian wrote:

> In Europe for self declaration for the application of the CE marking, what 
> Safety and EMC tests/standards/directives are required for Parts Washers and 
> Sand Blast Cabinets, most typically used in shops and garages to clean auto, 
> farm, and machinery parts and the like?
> 
> Is there a family standard or just use the generic EMC requirements?
> 
> Since these are commercial/industrial motor driven devices with no RF 
> circuitry, what EMC tests have to be performed, if any?
> 
> I assume the IEC/EN 61010-1 would apply for safety. Do the AC Motor(s) have 
> to be approved by a European Safety Agency or is UL/CSA good enough? Are 
> there other more specific safety standards regarding these type of devices? I 
> assume the Parts Washers may have a flammability hazard if flammable solvent 
> is used. And Sand Blasting has its own safety issues, but these are just the 
> cabinets/enclosures with some kind of abrasive reclaim system.
> 
> Sorry I'm asking this kind of question, but this is for a US company that 
> would like to get into the European market and this is a category of product 
> I'm not at all familiar with.
> 
> Thanks to all for any information provided.
> 
> The Other Brian
> 

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[PSES] CE Requirements for Parts Washers & Sand Blast Cabinets

[Kunde, Brian]

In Europe for self declaration for the application of the CE marking, what 
Safety and EMC tests/standards/directives are required for Parts Washers and 
Sand Blast Cabinets, most typically used in shops and garages to clean auto, 
farm, and machinery parts and the like?

Is there a family standard or just use the generic EMC requirements?

Since these are commercial/industrial motor driven devices with no RF 
circuitry, what EMC tests have to be performed, if any?

I assume the IEC/EN 61010-1 would apply for safety. Do the AC Motor(s) have to 
be approved by a European Safety Agency or is UL/CSA good enough? Are there 
other more specific safety standards regarding these type of devices? I assume 
the Parts Washers may have a flammability hazard if flammable solvent is used. 
And Sand Blasting has its own safety issues, but these are just the 
cabinets/enclosures with some kind of abrasive reclaim system.

Sorry I'm asking this kind of question, but this is for a US company that would 
like to get into the European market and this is a category of product I'm not 
at all familiar with.

Thanks to all for any information provided.

The Other Brian


LECO Corporation Notice: This communication may contain confidential 
information intended for the named recipient(s) only. If you received this by 
mistake, please destroy it and notify us of the error. Thank you.

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