Manual for Emco Helmholtz coil 6434
Does anybody have a softcopy of the above? We bought this second-hand without the manual. Thanks. Regards, Wendy Nya LabOne Singapore Pte Ltd This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.org Instructions: http://listserv.ieee.org/listserv/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
FW: CALIBRATION AND CONSTRUCTION OF HELMHOLTZ COILS
This is a multi-part message in MIME format. Failed to attach the file. jgs Jim Sketoe M/C S106-3050 (314)232-4782 (Voice) (314)232-7391 (Fax) From: Gordon,Ian [mailto:ian.gor...@edwards.boc.com] Sent: Thursday, January 23, 2003 9:15 AM To: 'IEEE EMC-PSTC GROUP' Subject: CALIBRATION AND CONSTRUCTION OF HELMHOLTZ COILS All I would like to construct a Helmholtz coil to perform magnetic field immunity testing at DC frequencies and thus simulate the effect of a permanent magnet. There are some details on construction in EN61000-4-8 which details power frequency magnetic field immunity testing within the scope of the EMC directive. However the fields referred to are measured in A/m, whereas I need a field of, for example, 5mTesla. Can anybody advise me as to how to construct such a coil with a test volume of 0.5 x 0.5 x 0.5m and a field of 5mTesla? Thanks Ian Gordon _ This e-mail has been scanned for viruses by the WorldCom Internet Managed Scanning Service - powered by MessageLabs. For further information visit http://www.worldcom.com This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list" Title: FW: CALIBRATION AND CONSTRUCTION OF HELMHOLTZ COILS Failed to attach the file. jgs Jim Sketoe M/C S106-3050 (314)232-4782 (Voice) (314)232-7391 (Fax) -Original Message- From: Gordon,Ian [mailto:ian.gor...@edwards.boc.com] Sent: Thursday, January 23, 2003 9:15 AM To: 'IEEE EMC-PSTC GROUP' Subject: CALIBRATION AND CONSTRUCTION OF HELMHOLTZ COILS All I would like to construct a Helmholtz coil to perform magnetic field immunity testing at DC frequencies and thus simulate the effect of a permanent magnet. There are some details on construction in EN61000-4-8 which details power frequency magnetic field immunity testing within the scope of the EMC directive. However the fields referred to are measured in A/m, whereas I need a field of, for example, 5mTesla. Can anybody advise me as to how to construct such a coil with a test volume of 0.5 x 0.5 x 0.5m and a field of 5mTesla? Thanks Ian Gordon _ This e-mail has been scanned for viruses by the WorldCom Internet Managed Scanning Service - powered by MessageLabs. For further information visit http://www.worldcom.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list" RUBENS.DOC Description: Binary data
FW: CALIBRATION AND CONSTRUCTION OF HELMHOLTZ COILS
This sounds much like what I call Rubens Coil. The attached Word doc describes the unit. Mr. Rubens deserves the credit. jgs Jim Sketoe M/C S106-3050 (314)232-4782 (Voice) (314)232-7391 (Fax) From: Gordon,Ian [mailto:ian.gor...@edwards.boc.com] Sent: Thursday, January 23, 2003 9:15 AM To: 'IEEE EMC-PSTC GROUP' Subject: CALIBRATION AND CONSTRUCTION OF HELMHOLTZ COILS All I would like to construct a Helmholtz coil to perform magnetic field immunity testing at DC frequencies and thus simulate the effect of a permanent magnet. There are some details on construction in EN61000-4-8 which details power frequency magnetic field immunity testing within the scope of the EMC directive. However the fields referred to are measured in A/m, whereas I need a field of, for example, 5mTesla. Can anybody advise me as to how to construct such a coil with a test volume of 0.5 x 0.5 x 0.5m and a field of 5mTesla? Thanks Ian Gordon _ This e-mail has been scanned for viruses by the WorldCom Internet Managed Scanning Service - powered by MessageLabs. For further information visit http://www.worldcom.com This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list" This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
RE: Helmholtz article
See the May 2002 issue From: drcuthbert [mailto:drcuthb...@micron.com] Sent: Friday, January 31, 2003 6:55 AM To: emc-p...@ieee.org Subject: Helmholtz article Here is the link to the Conformity magazine article: Magnetic Field Calibration: Unwinding The Helmholtz Coil, by Isidor Straus http://www.conformity.com/featurearticlesarchive.html#June%202002 I used the formulas in this article to design and build an active ELF loop antenna. Dave Cuthbert Micron Technology This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
Helmholtz article
Here is the link to the Conformity magazine article: Magnetic Field Calibration: Unwinding The Helmholtz Coil, by Isidor Straus http://www.conformity.com/featurearticlesarchive.html#June%202002 I used the formulas in this article to design and build an active ELF loop antenna. Dave Cuthbert Micron Technology This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
Re: CALIBRATION AND CONSTRUCTION OF HELMHOLTZ COILS
The relationship between Amps per meter and Teslas is easily derived from the basic relationship: B = uH, where B is magnetic induction in Teslas or Webers per square meter, u = permeability of material which has units of Henries per meter, H = magnetic field, with units of Amperes per meter. >From: "Gordon,Ian" >To: "'IEEE EMC-PSTC GROUP'" >Subject: CALIBRATION AND CONSTRUCTION OF HELMHOLTZ COILS >Date: Thu, Jan 23, 2003, 9:15 AM > > > All > I would like to construct a Helmholtz coil to perform magnetic field > immunity testing at DC frequencies and thus simulate the effect of a > permanent magnet. There are some details on construction in EN61000-4-8 > which details power frequency magnetic field immunity testing within the > scope of the EMC directive. However the fields referred to are measured in > A/m, whereas I need a field of, for example, 5mTesla. > Can anybody advise me as to how to construct such a coil with a test volume > of 0.5 x 0.5 x 0.5m and a field of 5mTesla? > Thanks > Ian Gordon > > > _ > This e-mail has been scanned for viruses by the WorldCom Internet Managed > Scanning Service - powered by MessageLabs. For further information visit > http://www.worldcom.com > > --- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Ron Pickard: emc-p...@hypercom.com > Dave Heald: davehe...@attbi.com > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > All emc-pstc postings are archived and searchable on the web at: > http://ieeepstc.mindcruiser.com/ > Click on "browse" and then "emc-pstc mailing list" > This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
RE: CALIBRATION AND CONSTRUCTION OF HELMHOLTZ COILS
>-Original Message- >From: Gordon,Ian [mailto:ian.gor...@edwards.boc.com] >Sent: Thursday, January 23, 2003 7:15 AM >To: 'IEEE EMC-PSTC GROUP' >Subject: CALIBRATION AND CONSTRUCTION OF HELMHOLTZ COILS > > > >All >I would like to construct a Helmholtz coil to perform magnetic field >immunity testing at DC frequencies and thus simulate the effect of a >permanent magnet. There are some details on construction in EN61000-4-8 >which details power frequency magnetic field immunity testing >within the >scope of the EMC directive. However the fields referred to are >measured in >A/m, whereas I need a field of, for example, 5mTesla. >Can anybody advise me as to how to construct such a coil with >a test volume >of 0.5 x 0.5 x 0.5m and a field of 5mTesla? >Thanks >Ian Gordon > > OK, less drama and more numbers. In a Helmholtz, the "sweet spot" or volume, should be limited to 1/3 the distance between the coils. So that means that coil separation should be 150cm to yield a test volume of 50cm. And, the definition of a Helmholtz is two identical flat coils, in plane, and separated by the radius of the coil. So, the radius of the coil is also 150cm. Now, the Helmholtz equation, re-arranged to find necessary current when the field (Gauss), turns (N), radius (a, in cm) and separation (cm) are known. I= [((5)^^(1.5)) x a x 10 x Gauss] / [ 32 x Pi x N ] So, lets try with a 150 cm radius & separation coil, with 50 turns, looking for 50 Gauss (which is equivalent to your 5 milliTeslas). I = [((5)^^(1.5) x 150 x 10 x 50] / [ 32 x Pi x 50] (please don't let me mess this up) I = 838526 / 5026 = 167 Amps The only variables you can work with are number of turns and current. What size power supply have you got? Ed Ed Price ed.pr...@cubic.com Electromagnetic Compatibility Lab Cubic Defense Systems San Diego, CA USA 858-505-2780 (Voice) 858-505-1583 (Fax) Military & Avionics EMC Is Our Specialty Shake-Bake-Shock - Metrology - Reliability Analysis This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
RE: CALIBRATION AND CONSTRUCTION OF HELMHOLTZ COILS
Gordon, the May 2002 issue of Conformity magazine had an excellent article on Helmholtz coils. I checked their website but didn't see how to access old issues. If you can't get a copy online I will be glad to FAX you a copy of the article. To put things in perspective we can think about the field around an infinite length wire. Say the wire has a current of 1 ampere and the point of measurement is 1 meter away. The field H is (1A)/(2Pi meters)= 0.16 A/m. Now B=uH and u = 1.256uH/m. So, B= (1.256uH)(0.16A/m) = 200nT. To obtain 5mT one would need 25,000 amps with this arrangement! Let's do a Helmholtz: H = 1.43(nI/d) where d is the diameter of the circular coil. The coils are spaced one diameter. For coils with a diameter of 1 meter, one turn, and one ampere the field H is 1.43 A/m. You need about 4000 A/m for 5mT. Lots of amps. How about 200 turns at 20 amps? That will do it. So, two 1-meter coils with 200 turns of #12 AWG wire with 20 amps flowing. The resistance at 100 deg C is about 10 ohms, so 200 VDC is needed. 2000 watts. Smokin!! Dave Cuthbert Micron Technology From: Gordon,Ian [mailto:ian.gor...@edwards.boc.com] Sent: Thursday, January 23, 2003 8:15 AM To: 'IEEE EMC-PSTC GROUP' Subject: CALIBRATION AND CONSTRUCTION OF HELMHOLTZ COILS All I would like to construct a Helmholtz coil to perform magnetic field immunity testing at DC frequencies and thus simulate the effect of a permanent magnet. There are some details on construction in EN61000-4-8 which details power frequency magnetic field immunity testing within the scope of the EMC directive. However the fields referred to are measured in A/m, whereas I need a field of, for example, 5mTesla. Can anybody advise me as to how to construct such a coil with a test volume of 0.5 x 0.5 x 0.5m and a field of 5mTesla? Thanks Ian Gordon _ This e-mail has been scanned for viruses by the WorldCom Internet Managed Scanning Service - powered by MessageLabs. For further information visit http://www.worldcom.com This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list" This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
RE: CALIBRATION AND CONSTRUCTION OF HELMHOLTZ COILS
>-Original Message- >From: Gordon,Ian [mailto:ian.gor...@edwards.boc.com] >Sent: Thursday, January 23, 2003 7:15 AM >To: 'IEEE EMC-PSTC GROUP' >Subject: CALIBRATION AND CONSTRUCTION OF HELMHOLTZ COILS > > > >All >I would like to construct a Helmholtz coil to perform magnetic field >immunity testing at DC frequencies and thus simulate the effect of a >permanent magnet. There are some details on construction in EN61000-4-8 >which details power frequency magnetic field immunity testing >within the >scope of the EMC directive. However the fields referred to are >measured in >A/m, whereas I need a field of, for example, 5mTesla. >Can anybody advise me as to how to construct such a coil with >a test volume >of 0.5 x 0.5 x 0.5m and a field of 5mTesla? >Thanks >Ian Gordon > > Gordon, are you sure your numbers are correct? 5 milliTesla is equivalent to: 50 Gauss 4014 A/M 192 dBuA/M 194 dBpT and, if it were the H-field component of a plane wave: 1.5 million V/M 243 dBuV/M 6 x 10^^9 Watts/sq Meter I have a spreadsheet that calculates these values. I'll send you a copy off-line. Verify your requirements, and then we can find what you need to build. Ed This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
helmholtz
The resistance is about 20 ohms, and not 10 ohms. Now you needed 400 volts to obtain 20 amps through the two coils in series. Or, run them in parallel with 200 volts. This might be off a bit but I get 5 mN for the force between the two coils. So, they aren't going to tear the setup apart. Almost a 5000 foot spool of wire needed per coil. This looks like a fun project. Dave Cuthbert This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
Re: CALIBRATION AND CONSTRUCTION OF HELMHOLTZ COILS
Ian, Contact me off line and I will share with you the SW tools (free on the internet) that I use to do these calculations. The first is an antiquated tool that runs on DOS called Computer Calculus 4.0, or CC4 I like it because it's powerful but easy to learn and retain. The second is a 2D finite element analysis program called femm that is located at http://femm.berlios.de/ When you use the SW in asymmetric analysis you get true 3D values, so it's very powerful. You can use the program for plotting the B field over whatever effective area of interest you're after. - Robert - Robert A. Macy, PEm...@california.com 408 286 3985 fx 408 297 9121 AJM International Electronics Consultants 101 E San Fernando, Suite 402 San Jose, CA 95112 From: "Gordon,Ian" To: "'IEEE EMC-PSTC GROUP'" Sent: Thursday, January 23, 2003 7:15 AM Subject: CALIBRATION AND CONSTRUCTION OF HELMHOLTZ COILS > > All > I would like to construct a Helmholtz coil to perform magnetic field > immunity testing at DC frequencies and thus simulate the effect of a > permanent magnet. There are some details on construction in EN61000-4-8 > which details power frequency magnetic field immunity testing within the > scope of the EMC directive. However the fields referred to are measured in > A/m, whereas I need a field of, for example, 5mTesla. > Can anybody advise me as to how to construct such a coil with a test volume > of 0.5 x 0.5 x 0.5m and a field of 5mTesla? > Thanks > Ian Gordon > > This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
CALIBRATION AND CONSTRUCTION OF HELMHOLTZ COILS
All I would like to construct a Helmholtz coil to perform magnetic field immunity testing at DC frequencies and thus simulate the effect of a permanent magnet. There are some details on construction in EN61000-4-8 which details power frequency magnetic field immunity testing within the scope of the EMC directive. However the fields referred to are measured in A/m, whereas I need a field of, for example, 5mTesla. Can anybody advise me as to how to construct such a coil with a test volume of 0.5 x 0.5 x 0.5m and a field of 5mTesla? Thanks Ian Gordon _ This e-mail has been scanned for viruses by the WorldCom Internet Managed Scanning Service - powered by MessageLabs. For further information visit http://www.worldcom.com This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
Helmholtz Coils
Surely, someone out there has the vector equations describing the magnetic field iof a classic Helmholtz coil. My vector equations class, being 30+ years ago, is just too dim. I keep getting the derivation wrapped around the axle. The centerline equation, H=0.716NI/r, is readily available; however, I want to analyze the interior volume and, if practical, the exterior volume. Jim Sketoe Boeing Company (314)925-4735 james.g.ske...@boeing.com
