Re: ESD Brush
Hi Bill Even the discharge from a charged penny can have a high peak current, many Amperes, and a sub-nanosecond pulse width. With today's high speed circuitry, these small but fast events (di/dt much higher at low voltages than high voltages) can cause upsets. So it is best not to take chances. Just the capacitance of the brush itself is enough. And even a 300 volt difference will result in a large di/dt when connection is made. Best to be safe. I think you will like the design of the easy to build discharge wand I will post this weekend (pictures taken, just need to add the text). The main component is a plastic ball point pen. Doug On 10/28/11 4:01 PM, Bill Owsley wrote: Doug, ( a somewhat disjointed note, numerous interruptions) The initial ESD event charges the EUT up to the value of the applied ESD thru the series resistor in the gun and the displacement current from the EUT to the reference plane . A somewhat high current event. In the standard, when this initial charge has decayed below 10 % of the initial value, it is considered discharged. So the initial event is some voltage in 150 pF thru 330 ohms to then dissipate by natural decay until one can touch the brush to the EUT to discharge the remaining voltage thru the mentioned 1 pf cap (resistor and wire tip?) bypassing the 470 Kohm resistor and then into some inductance of the wire between the two 470 Kohm resistors and some parallel capacitance of this assembly to the reference plane that conducts a displacement current. The EUT capacitance to reference place might of the same order depending on relative sizes. The wire from the closest resistor to the tip is suggested to be less than 30 mm. The capacitance of that to the EUT seems to be on the smallish side and parallel to the wire ? All these parasitic capacitance's seem to be in series. Now what invokes the dv/dt in the first place? The contact of the brush to the charged EUT. If the parasitic capacitance was significant enough then there would be no need for the conductive path, but there is no dv/dt to use that capacitance - until a conductive path is established and that path involves a static charge into two 470 Kohm resistors which brings to mind the RC time constant. So, my impression is dt = RC, I = Cdv/RC = dv/R From: Doug Smith <mailto:d...@emcesd.com> To: Bill Owsley <mailto:wdows...@yahoo.com> Cc: Scott Douglas <mailto:emcp...@radiusnorth.net> ; "emc-p...@ieee.org" <mailto:emc-p...@ieee.org> <mailto:emc-p...@ieee.org> Sent: Friday, October 28, 2011 4:37 PM Subject: Re: ESD Brush Hi Bill, Not sure of your question about the current loop. The discharge is one of a small capacitor, and the air path is not negligible (displacement current completing the loop). Low frequency analysis does not apply here. Doug On 10/27/11 11:14 PM, Bill Owsley wrote: And what might the current loop be? ps. what was the intial intentional ESD current into the EUT? to bring it up to equal charge? If you are really quick, you might get the discharge brush in before the voltage has decayed a lot. From: Doug Smith <mailto:d...@emcesd.com> To: Bill <mailto:wdows...@yahoo.com> Cc: Scott Douglas <mailto:emcp...@radiusnorth.net> ; "emc-p...@ieee.org" <mailto:emc-p...@ieee.org> <mailto:emc-p...@ieee.org> Sent: Friday, October 28, 2011 12:29 AM Subject: Re: ESD Brush Anything really conductive like copper or low resistance carbon fibers will subject the EUT multi-ampere CDM-like (charged device model) ESD events. In addition the 470K resistors are good low value capacitors to ESD and can also allow fast high peak currents as well. Plus the wire from the closest resistor to the tip has capacitance as well. Note: I = Cdv/dt = 1pF * 2000V/1ns = 2 Amperes of current!! At 8 kV thus would be a fast peak of 8 Amperes. I am currently writing a new Technical Tidbit on the best way to do this. It will be up this weekend so don't want to write it twice here. Will post link to the article. Doug Tel: 408-356-4186 Mobile: 408-858-4528 Email: d...@dsmith.org Sent: from my iPhone On Oct 27, 2011, at 19:30, Bill wrote: When used with the two 470 Kohm resistors, anything conductive to brush the contact
Re: ESD Brush
Doug, ( a somewhat disjointed note, numerous interruptions) The initial ESD event charges the EUT up to the value of the applied ESD thru the series resistor in the gun and the displacement current from the EUT to the reference plane . A somewhat high current event. In the standard, when this initial charge has decayed below 10 % of the initial value, it is considered discharged. So the initial event is some voltage in 150 pF thru 330 ohms to then dissipate by natural decay until one can touch the brush to the EUT to discharge the remaining voltage thru the mentioned 1 pf cap (resistor and wire tip?) bypassing the 470 Kohm resistor and then into some inductance of the wire between the two 470 Kohm resistors and some parallel capacitance of this assembly to the reference plane that conducts a displacement current. The EUT capacitance to reference place might of the same order depending on relative sizes. The wire from the closest resistor to the tip is suggested to be less than 30 mm. The capacitance of that to the EUT seems to be on the smallish side and parallel to the wire ? All these parasitic capacitance's seem to be in series. Now what invokes the dv/dt in the first place? The contact of the brush to the charged EUT. If the parasitic capacitance was significant enough then there would be no need for the conductive path, but there is no dv/dt to use that capacitance - until a conductive path is established and that path involves a static charge into two 470 Kohm resistors which brings to mind the RC time constant. So, my impression is dt = RC, I = Cdv/RC = dv/R From: Doug Smith To: Bill Owsley Cc: Scott Douglas ; "emc-p...@ieee.org" Sent: Friday, October 28, 2011 4:37 PM Subject: Re: ESD Brush Hi Bill, Not sure of your question about the current loop. The discharge is one of a small capacitor, and the air path is not negligible (displacement current completing the loop). Low frequency analysis does not apply here. Doug On 10/27/11 11:14 PM, Bill Owsley wrote: And what might the current loop be? ps. what was the intial intentional ESD current into the EUT? to bring it up to equal charge? If you are really quick, you might get the discharge brush in before the voltage has decayed a lot. From: Doug Smith <mailto:d...@emcesd.com> To: Bill <mailto:wdows...@yahoo.com> Cc: Scott Douglas <mailto:emcp...@radiusnorth.net> ; "emc-p...@ieee.org" <mailto:emc-p...@ieee.org> <mailto:emc-p...@ieee.org> Sent: Friday, October 28, 2011 12:29 AM Subject: Re: ESD Brush Anything really conductive like copper or low resistance carbon fibers will subject the EUT multi-ampere CDM-like (charged device model) ESD events. In addition the 470K resistors are good low value capacitors to ESD and can also allow fast high peak currents as well. Plus the wire from the closest resistor to the tip has capacitance as well. Note: I = Cdv/dt = 1pF * 2000V/1ns = 2 Amperes of current!! At 8 kV thus would be a fast peak of 8 Amperes. I am currently writing a new Technical Tidbit on the best way to do this. It will be up this weekend so don't want to write it twice here. Will post link to the article. Doug Tel: 408-356-4186 Mobile: 408-858-4528 Email: d...@dsmith.org Sent: from my iPhone On Oct 27, 2011, at 19:30, Bill wrote: When used with the two 470 Kohm resistors, anything conductive to brush the contact locations and EUT to reduce any induced charge back to the "ground" level will work just fine. As will just standing around for a minute or two, or an ion generator that is turned on after the discharge and NOT during the discharge. The brush is a speed enhancer. The resistors in the line are an attempt to reduce a secondary discharge due to the build up from the initial discharge or a wimpy discharge into an already charged item - low current since the voltage delta is less than expected, or larger than expected discharge if you reverse polarity for the next shot. A breath of warm moist human exhalation across the item will knock the charge build up out rather quick. PS. you'll find this is a highly variable test. I don't think any results have ever been duplicated. ;-) On 10/27/2011 09:58 PM, Scott Douglas wrote: Sending for the subscriber by List Admin. Subject: ESD Brush From: "Sundstrom, Michael" < <mailto:michael_sundst...@overheaddoor.com> micha
Re: ESD Brush
Hi Bill, Not sure of your question about the current loop. The discharge is one of a small capacitor, and the air path is not negligible (displacement current completing the loop). Low frequency analysis does not apply here. Doug On 10/27/11 11:14 PM, Bill Owsley wrote: And what might the current loop be? ps. what was the intial intentional ESD current into the EUT? to bring it up to equal charge? If you are really quick, you might get the discharge brush in before the voltage has decayed a lot. From: Doug Smith <mailto:d...@emcesd.com> To: Bill <mailto:wdows...@yahoo.com> Cc: Scott Douglas <mailto:emcp...@radiusnorth.net> ; "emc-p...@ieee.org" <mailto:emc-p...@ieee.org> <mailto:emc-p...@ieee.org> Sent: Friday, October 28, 2011 12:29 AM Subject: Re: ESD Brush Anything really conductive like copper or low resistance carbon fibers will subject the EUT multi-ampere CDM-like (charged device model) ESD events. In addition the 470K resistors are good low value capacitors to ESD and can also allow fast high peak currents as well. Plus the wire from the closest resistor to the tip has capacitance as well. Note: I = Cdv/dt = 1pF * 2000V/1ns = 2 Amperes of current!! At 8 kV thus would be a fast peak of 8 Amperes. I am currently writing a new Technical Tidbit on the best way to do this. It will be up this weekend so don't want to write it twice here. Will post link to the article. Doug Tel: 408-356-4186 Mobile: 408-858-4528 Email: d...@dsmith.org Sent: from my iPhone On Oct 27, 2011, at 19:30, Bill wrote: When used with the two 470 Kohm resistors, anything conductive to brush the contact locations and EUT to reduce any induced charge back to the "ground" level will work just fine. As will just standing around for a minute or two, or an ion generator that is turned on after the discharge and NOT during the discharge. The brush is a speed enhancer. The resistors in the line are an attempt to reduce a secondary discharge due to the build up from the initial discharge or a wimpy discharge into an already charged item - low current since the voltage delta is less than expected, or larger than expected discharge if you reverse polarity for the next shot. A breath of warm moist human exhalation across the item will knock the charge build up out rather quick. PS. you'll find this is a highly variable test. I don't think any results have ever been duplicated. ;-) On 10/27/2011 09:58 PM, Scott Douglas wrote: Sending for the subscriber by List Admin. Subject: ESD Brush From: "Sundstrom, Michael" < <mailto:michael_sundst...@overheaddoor.com> michael_sundst...@overheaddoor.com> List-Post: emc-pstc@listserv.ieee.org Date: 10/27/2011 9:47 AM To: " <mailto:EMC-PSTC@LISTSERV.IEEE.ORG> EMC-PSTC@LISTSERV.IEEE.ORG" < <mailto:EMC-PSTC@LISTSERV.IEEE.ORG> EMC-PSTC@LISTSERV.IEEE.ORG> I’m looking to test an ungrounded module to IEC 61000-4-2 . Of which 7.2.4.deals with ungrounded equipment. In 7.2.4.1 General (toward the end ) it says you can: sweeping of the EUT with a grounded carbon fibre brush with bleeder resistors (for example, 2 × 470 kÙ) in the grounding cable. Where can I find a carbon fiber brush I can then ground (with two 470Kohm resistors)? Would a fanned out multi-strand copper wire work just as well to dissipate the ESD charge buildup? Thanks for any help, Michael Sundstrom OHD / TREQ Dallas Electronic Lab Analyst, EMC Lead 2170 French Settlement Rd, Suite B Dallas, Texas 75212 (214) 579 6312 (940) 390 3644c KB5UKT - 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 All emc-pstc postings are archived and searchable on the web at http://product-compliance.oc.ieee.org/ Graphics (in well-used formats), large files, etc. can be posted to that URL.
RE: [PSES] ESD Brush
This is the brush I use. http://www.gordonbrush.com/thunderon/go t-conductive-short-handle-brush-p-1323-l-en.html -David Gray From: Scott Douglas [mailto:emcp...@radiusnorth.net] Sent: Thursday, October 27, 2011 6:58 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] ESD Brush Sending for the subscriber by List Admin. Subject: ESD Brush From: "Sundstrom, Michael" <mailto:michael_sundst...@overheaddoor.com> List-Post: emc-pstc@listserv.ieee.org Date: 10/27/2011 9:47 AM To: "EMC-PSTC@LISTSERV.IEEE.ORG" <mailto:EMC-PSTC@LISTSERV.IEEE.ORG> <mailto:EMC-PSTC@LISTSERV.IEEE.ORG> I’m looking to test an ungrounded module to IEC 61000-4-2 . Of which 7.2.4.deals with ungrounded equipment. In 7.2.4.1 General (toward the end ) it says you can: sweeping of the EUT with a grounded carbon fibre brush with bleeder resistors (for example, 2 × 470 kÙ) in the grounding cable. Where can I find a carbon fiber brush I can then ground (with two 470Kohm resistors)? Would a fanned out multi-strand copper wire work just as well to dissipate the ESD charge buildup? Thanks for any help, Michael Sundstrom OHD / TREQ Dallas Electronic Lab Analyst, EMC Lead 2170 French Settlement Rd, Suite B Dallas, Texas 75212 (214) 579 6312 (940) 390 3644c KB5UKT - 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 All emc-pstc postings are archived and searchable on the web at http://product-compliance.oc.ieee.org/ Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas Mike Cantwell For policy questions, send mail to: Jim Bacher David Heald - 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 All emc-pstc postings are archived and searchable on the web at http://product-compliance.oc.ieee.org/ Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas Mike Cantwell For policy questions, send mail to: Jim Bacher David Heald
Re: ESD Brush
And what might the current loop be?
ps. what was the intial intentional ESD current into the EUT? to bring it up to
equal charge?
If you are really quick, you might get the discharge brush in before the
voltage has decayed a lot.
From: Doug Smith
To: Bill
Cc: Scott Douglas ; "emc-p...@ieee.org"
Sent: Friday, October 28, 2011 12:29 AM
Subject: Re: ESD Brush
Anything really conductive like copper or low resistance carbon fibers will
subject the EUT multi-ampere CDM-like (charged device model) ESD events. In
addition the 470K resistors are good low value capacitors to ESD and can also
allow fast high peak currents as well. Plus the wire from the closest resistor
to the tip has capacitance as well. Note: I = Cdv/dt = 1pF * 2000V/1ns = 2
Amperes of current!! At 8 kV thus would be a fast peak of 8 Amperes.
I am currently writing a new Technical Tidbit on the best way to do this. It
will be up this weekend so don't want to write it twice here. Will post link to
the article.
Doug
Tel: 408-356-4186
Mobile: 408-858-4528
Email: <mailto:d...@dsmith.org> d...@dsmith.org
Sent: from my iPhone
On Oct 27, 2011, at 19:30, Bill wrote:
When used with the two 470 Kohm resistors, anything conductive to brush
the contact locations and EUT to reduce any induced charge back to the "ground"
level will work just fine.
As will just standing around for a minute or two, or an ion generator
that is turned on after the discharge and NOT during the discharge.
The brush is a speed enhancer.
The resistors in the line are an attempt to reduce a secondary
discharge due to the build up from the initial discharge or a wimpy discharge
into an already charged item - low current since the voltage delta is less than
expected, or larger than expected discharge if you reverse polarity for the
next shot.
A breath of warm moist human exhalation across the item will knock the
charge build up out rather quick.
PS. you'll find this is a highly variable test. I don't think any
results have ever been duplicated. ;-)
On 10/27/2011 09:58 PM, Scott Douglas wrote:
Sending for the subscriber by List Admin.
Subject:
ESD Brush
From:
"Sundstrom, Michael" < <mailto:michael_sundst...@overheaddoor.com>
michael_sundst...@overheaddoor.com>
List-Post: emc-pstc@listserv.ieee.org
Date:
10/27/2011 9:47 AM
To:
" <mailto:EMC-PSTC@LISTSERV.IEEE.ORG> EMC-PSTC@LISTSERV.IEEE.ORG" <
<mailto:EMC-PSTC@LISTSERV.IEEE.ORG> EMC-PSTC@LISTSERV.IEEE.ORG>
I’m looking to test an ungrounded module to IEC 61000-4-2 . Of
which 7.2.4.deals with ungrounded equipment. In 7.2.4.1 General (toward the end
) it says you can: sweeping of the EUT with a grounded carbon fibre brush with
bleeder resistors (for example, 2 × 470 kÙ) in the grounding cable.
Where can I find a carbon fiber brush I can then ground (with
two 470Kohm resistors)? Would a fanned out multi-strand copper wire work just
as well to dissipate the ESD charge buildup?
Thanks for any help,
Michael Sundstrom
OHD / TREQ Dallas
Electronic Lab Analyst, EMC Lead
2170 French Settlement Rd, Suite B
Dallas, Texas 75212
(214) 579 6312
(940) 390 3644c
KB5UKT
-
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 < <mailto:emc-p...@ieee.org> emc-p...@ieee.org>
All emc-pstc postings are archived and searchable on the web at
http://product-compliance.oc.ieee.org/
Graphics (in well-used formats), large files, etc. can be
posted to that URL.
Website: http://www.ieee-pses.org/
Instructions: http://listserv.ieee.org/request/user-guide.html
List rules: http://www.ieee-pses.org/listrules.html
For help, send mail to the list administrators:
Scott Douglas < <mailto:emcp...@radiusnorth.net>
emcp...@radiusnorth.net>
Mike Cantwell < <mailto:mcantw...@ieee.org> mcantw...@ieee.org>
For policy questions, send mail to:
Jim Bacher < <mailto:j.bac...@ieee.org> j.bac...@ieee.org>
David Heald < <mailto:dhe...@gmail.com> dhe...@gmail.com>
-
This message is from the IEEE Product S
Re: ESD Brush
Anything really conductive like copper or low resistance carbon fibers will
subject the EUT multi-ampere CDM-like (charged device model) ESD events. In
addition the 470K resistors are good low value capacitors to ESD and can also
allow fast high peak currents as well. Plus the wire from the closest resistor
to the tip has capacitance as well. Note: I = Cdv/dt = 1pF * 2000V/1ns = 2
Amperes of current!! At 8 kV thus would be a fast peak of 8 Amperes.
I am currently writing a new Technical Tidbit on the best way to do this. It
will be up this weekend so don't want to write it twice here. Will post link to
the article.
Doug
Tel: 408-356-4186
Mobile: 408-858-4528
Email: <mailto:d...@dsmith.org> d...@dsmith.org
Sent: from my iPhone
On Oct 27, 2011, at 19:30, Bill wrote:
When used with the two 470 Kohm resistors, anything conductive to brush
the contact locations and EUT to reduce any induced charge back to the "ground"
level will work just fine.
As will just standing around for a minute or two, or an ion generator
that is turned on after the discharge and NOT during the discharge.
The brush is a speed enhancer.
The resistors in the line are an attempt to reduce a secondary
discharge due to the build up from the initial discharge or a wimpy discharge
into an already charged item - low current since the voltage delta is less than
expected, or larger than expected discharge if you reverse polarity for the
next shot.
A breath of warm moist human exhalation across the item will knock the
charge build up out rather quick.
PS. you'll find this is a highly variable test. I don't think any
results have ever been duplicated. ;-)
On 10/27/2011 09:58 PM, Scott Douglas wrote:
Sending for the subscriber by List Admin.
Subject:
ESD Brush
From:
"Sundstrom, Michael" < <mailto:michael_sundst...@overheaddoor.com>
michael_sundst...@overheaddoor.com>
List-Post: emc-pstc@listserv.ieee.org
Date:
10/27/2011 9:47 AM
To:
" <mailto:EMC-PSTC@LISTSERV.IEEE.ORG> EMC-PSTC@LISTSERV.IEEE.ORG" <
<mailto:EMC-PSTC@LISTSERV.IEEE.ORG> EMC-PSTC@LISTSERV.IEEE.ORG>
I’m looking to test an ungrounded module to IEC 61000-4-2 . Of
which 7.2.4.deals with ungrounded equipment. In 7.2.4.1 General (toward the end
) it says you can: sweeping of the EUT with a grounded carbon fibre brush with
bleeder resistors (for example, 2 × 470 kÙ) in the grounding cable.
Where can I find a carbon fiber brush I can then ground (with
two 470Kohm resistors)? Would a fanned out multi-strand copper wire work just
as well to dissipate the ESD charge buildup?
Thanks for any help,
Michael Sundstrom
OHD / TREQ Dallas
Electronic Lab Analyst, EMC Lead
2170 French Settlement Rd, Suite B
Dallas, Texas 75212
(214) 579 6312
(940) 390 3644c
KB5UKT
-
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 < <mailto:emc-p...@ieee.org> emc-p...@ieee.org>
All emc-pstc postings are archived and searchable on the web at
<http://product-compliance.oc.ieee.org/> http://product-compliance.oc.ieee.org/
Graphics (in well-used formats), large files, etc. can be
posted to that URL.
Website: <http://www.ieee-pses.org/> http://www.ieee-pses.org/
Instructions:
<http://listserv.ieee.org/request/user-guide.html>
http://listserv.ieee.org/request/user-guide.html
List rules: <http://www.ieee-pses.org/listrules.html>
http://www.ieee-pses.org/listrules.html
For help, send mail to the list administrators:
Scott Douglas < <mailto:emcp...@radiusnorth.net>
emcp...@radiusnorth.net>
Mike Cantwell < <mailto:mcantw...@ieee.org> mcantw...@ieee.org>
For policy questions, send mail to:
Jim Bacher < <mailto:j.bac...@ieee.org> j.bac...@ieee.org>
David Heald < <mailto:dhe...@gmail.com> dhe...@gmail.com>
-
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 <
<mailto:emc-p...@ieee.org> emc-p...@ieee.org>
All emc-pstc postings are archived and s
Re: ESD Brush
When used with the two 470 Kohm resistors, anything conductive to brush the
contact locations and EUT to reduce any induced charge back to the "ground"
level will work just fine.
As will just standing around for a minute or two, or an ion generator that is
turned on after the discharge and NOT during the discharge.
The brush is a speed enhancer.
The resistors in the line are an attempt to reduce a secondary discharge due
to the build up from the initial discharge or a wimpy discharge into an
already charged item - low current since the voltage delta is less than
expected, or larger than expected discharge if you reverse polarity for the
next shot.
A breath of warm moist human exhalation across the item will knock the charge
build up out rather quick.
PS. you'll find this is a highly variable test. I don't think any results
have ever been duplicated. ;-)
On 10/27/2011 09:58 PM, Scott Douglas wrote:
Sending for the subscriber by List Admin.
Subject:
ESD Brush
From:
"Sundstrom, Michael"
<mailto:michael_sundst...@overheaddoor.com>
List-Post: emc-pstc@listserv.ieee.org
Date:
10/27/2011 9:47 AM
To:
"EMC-PSTC@LISTSERV.IEEE.ORG" <mailto:EMC-PSTC@LISTSERV.IEEE.ORG>
<mailto:EMC-PSTC@LISTSERV.IEEE.ORG>
I’m looking to test an ungrounded module to IEC 61000-4-2 . Of which
7.2.4.deals with ungrounded equipment. In 7.2.4.1 General (toward the end ) it
says you can: sweeping of the EUT with a grounded carbon fibre brush with
bleeder resistors (for example, 2 × 470 kÙ) in the grounding cable.
Where can I find a carbon fiber brush I can then ground (with two
470Kohm
resistors)? Would a fanned out multi-strand copper wire work just as well to
dissipate the ESD charge buildup?
Thanks for any help,
Michael Sundstrom
OHD / TREQ Dallas
Electronic Lab Analyst, EMC Lead
2170 French Settlement Rd, Suite B
Dallas, Texas 75212
(214) 579 6312
(940) 390 3644c
KB5UKT
-
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
All emc-pstc postings are archived and searchable on the web at
http://product-compliance.oc.ieee.org/
Graphics (in well-used formats), large files, etc. can be posted to
that URL.
Website: http://www.ieee-pses.org/
Instructions: http://listserv.ieee.org/request/user-guide.html
List rules: http://www.ieee-pses.org/listrules.html
For help, send mail to the list administrators:
Scott Douglas
Mike Cantwell
For policy questions, send mail to:
Jim Bacher
David Heald
-
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
All emc-pstc postings are archived and searchable on the web at
http://product-compliance.oc.ieee.org/
Graphics (in well-used formats), large files, etc. can be posted to that URL.
Website: http://www.ieee-pses.org/
Instructions: http://listserv.ieee.org/request/user-guide.html
List rules: http://www.ieee-pses.org/listrules.html
For help, send mail to the list administrators:
Scott Douglas
Mike Cantwell
For policy questions, send mail to:
Jim Bacher
David Heald
ESD Brush
Sending for the subscriber by List Admin. Subject: ESD Brush From: "Sundstrom, Michael" <mailto:michael_sundst...@overheaddoor.com> List-Post: emc-pstc@listserv.ieee.org Date: 10/27/2011 9:47 AM To: "EMC-PSTC@LISTSERV.IEEE.ORG" <mailto:EMC-PSTC@LISTSERV.IEEE.ORG> <mailto:EMC-PSTC@LISTSERV.IEEE.ORG> I’m looking to test an ungrounded module to IEC 61000-4-2 . Of which 7.2.4.deals with ungrounded equipment. In 7.2.4.1 General (toward the end ) it says you can: sweeping of the EUT with a grounded carbon fibre brush with bleeder resistors (for example, 2 × 470 kÙ) in the grounding cable. Where can I find a carbon fiber brush I can then ground (with two 470Kohm resistors)? Would a fanned out multi-strand copper wire work just as well to dissipate the ESD charge buildup? Thanks for any help, Michael Sundstrom OHD / TREQ Dallas Electronic Lab Analyst, EMC Lead 2170 French Settlement Rd, Suite B Dallas, Texas 75212 (214) 579 6312 (940) 390 3644c KB5UKT - 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 All emc-pstc postings are archived and searchable on the web at http://product-compliance.oc.ieee.org/ Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas Mike Cantwell For policy questions, send mail to: Jim Bacher David Heald
