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Groups > sci.electronics.design > #464594
| From | Joerg <news@analogconsultants.com> |
|---|---|
| Newsgroups | sci.electronics.design |
| Subject | Re: EMI problems |
| Date | 2017-06-15 13:03 -0700 |
| Message-ID | <eqg7fhF8salU1@mid.individual.net> (permalink) |
| References | <gaf3kc5s96hufpak4qqm6avol7g05r27rc@4ax.com> <eqg5cjF8crpU1@mid.individual.net> <iqo5kcpa1n501kib60ro7ar7bb6ak1p17u@4ax.com> |
On 2017-06-15 12:47, John Larkin wrote: > On Thu, 15 Jun 2017 12:27:25 -0700, Joerg <news@analogconsultants.com> > wrote: > >> On 2017-06-14 16:09, John Larkin wrote: >>> >>> >>> I designed this little photodiode amp and I'm trying to measure its >>> output noise. All we can see on a spectrum analyser is radio and TV >>> stations. >>> >>> https://dl.dropboxusercontent.com/u/53724080/Otis/EMI/Sutro.JPG >>> >> >> Who installed those vents? Did they smoke some funny-smelling cigarettes? > > That's the roof of the San Francisco Ballet School. Artsy types. > Sometimes I can hear them practising. One of my engineers dances > Flamenco there, conveniently next door. > I wish we had a nice dance hall here because my wife and I did ballroom dancing in Europe. The only one we had for a few years was in a simple industrial building with fluorescent lighting, linoleum floor, having the romantic level of a Soviet stairwell. In Europe they had wet bars, tables, seats, mood lighting and most of all a polished wooden dance floor. Once in a while we go to Cafe Marcos in Lotus when they have live country music. There we can dance. The food is IMHO subpar but they always have very good beers on tap. >> >> >>> The *output* of the amp needs to be around 10 nV/rootHz. >>> >>> The DUT output is 100 ohm differential, which makes it harder. So we >>> took one of our standard products, an x100 1GHz amplifier, and hacked >>> a wideband transformer into the front end. Then I stuffed the DUT and >>> the X100 amp into a custom-machined shielded enclosure. >>> >>> https://dl.dropboxusercontent.com/u/53724080/Bypassing/E2_EMI_Encllosure.JPG >>> >>> The DUT is the smaller extruded box. There's enough gain that I can >>> use a scope to measure RMS noise voltage directly. >>> >>> Those are really nice shield cans, but before you can use them you >>> have to find a way to dispose of the filler materials that they come >>> with. >>> >> >> If you want a nice-looking smaller box there is also Fishermen's Friend. >> You can get cans with a more international flair: >> >> https://en.wikipedia.org/wiki/Fisherman's_Friend#/media/File:Fisherman%27s_Friend_Tin_Taiwan.jpg >> >> Be careful. The dad of a friend popped one and then fell asleep on the >> couch. When he woke up the cheek pointing towards the pillow had become >> numb like after a major dentist session. > > Some people like the Altoids cans for small stuff. > Some folks consider those too pedestrian because too many people carry them :-) -- Regards, Joerg http://www.analogconsultants.com/
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EMI problems John Larkin <jjlarkin@highland_snip_technology.com> - 2017-06-14 16:09 -0700
Re: EMI problems Martin Riddle <martin_ridd@verizon.net> - 2017-06-14 20:05 -0400
Re: EMI problems John Larkin <jjlarkin@highland_snip_technology.com> - 2017-06-14 18:01 -0700
Re: EMI problems o pere o <me@somewhere.net> - 2017-06-15 09:28 +0200
Re: EMI problems Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-06-15 10:59 -0400
Re: EMI problems Don Kuenz <g@crcomp.net> - 2017-06-21 02:53 +0000
Re: EMI problems John Larkin <jjlarkin@highlandtechnology.com> - 2017-06-15 07:59 -0700
Re: EMI problems George Herold <gherold@teachspin.com> - 2017-06-15 08:07 -0700
Re: EMI problems Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-06-15 11:12 -0400
Re: EMI problems George Herold <gherold@teachspin.com> - 2017-06-15 08:42 -0700
Re: EMI problems John Larkin <jjlarkin@highlandtechnology.com> - 2017-06-15 09:38 -0700
Re: EMI problems Robert Baer <robertbaer@localnet.com> - 2017-06-16 22:06 -0800
Re: EMI problems Jon Elson <jmelson@wustl.edu> - 2017-06-15 14:14 -0500
Re: EMI problems John Larkin <jjlarkin@highland_snip_technology.com> - 2017-06-15 13:55 -0700
Re: EMI problems Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-06-15 14:02 -0700
Re: EMI problems Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-06-16 12:43 -0400
Re: EMI problems John Larkin <jjlarkin@highland_snip_technology.com> - 2017-06-16 10:11 -0700
Re: EMI problems Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-06-16 13:24 -0400
Re: EMI problems Jeff Liebermann <jeffl@cruzio.com> - 2017-06-16 10:37 -0700
Re: EMI problems Jon Elson <jmelson@wustl.edu> - 2017-06-16 13:31 -0500
Re: EMI problems Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-06-16 14:46 -0400
Re: EMI problems John Larkin <jjlarkin@highland_snip_technology.com> - 2017-06-16 12:25 -0700
Re: EMI problems George Herold <gherold@teachspin.com> - 2017-06-16 13:07 -0700
Re: EMI problems John Larkin <jjlarkin@highland_snip_technology.com> - 2017-06-16 12:22 -0700
Re: EMI problems upsidedown@downunder.com - 2017-06-16 09:35 +0300
Re: EMI problems John Larkin <jjlarkin@highlandtechnology.com> - 2017-06-16 06:40 -0700
Re: EMI problems Joerg <news@analogconsultants.com> - 2017-06-15 12:27 -0700
Re: EMI problems John Larkin <jjlarkin@highland_snip_technology.com> - 2017-06-15 12:47 -0700
Re: EMI problems Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-06-15 12:57 -0700
Re: EMI problems Joerg <news@analogconsultants.com> - 2017-06-15 13:12 -0700
Re: EMI problems Joerg <news@analogconsultants.com> - 2017-06-15 13:03 -0700
Re: EMI problems "Lund-Nielsen, Jorgen" <jorgen.lund-nielsen@xyz123desy.de> - 2017-06-16 08:58 +0200
Re: EMI problems Jeff Liebermann <jeffl@cruzio.com> - 2017-06-16 10:03 -0700
Re: EMI problems John Larkin <jjlarkin@highland_snip_technology.com> - 2017-06-16 11:09 -0700
Re: EMI problems Jeff Liebermann <jeffl@cruzio.com> - 2017-06-16 12:06 -0700
Re: EMI problems John Larkin <jjlarkin@highland_snip_technology.com> - 2017-06-16 12:34 -0700
Re: EMI problems Jeff Liebermann <jeffl@cruzio.com> - 2017-06-17 09:22 -0700
Re: EMI problems John Larkin <jjlarkin@highlandtechnology.com> - 2017-06-17 10:08 -0700
Re: EMI problems John Larkin <jjlarkin@highlandtechnology.com> - 2017-06-17 11:07 -0700
Re: EMI problems Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2017-06-17 21:30 +0300
Re: EMI problems pcdhobbs@gmail.com - 2017-06-17 16:34 -0700
Re: EMI problems krw@notreal.com - 2017-06-17 20:44 -0400
Re: EMI problems George Herold <gherold@teachspin.com> - 2017-06-19 06:03 -0700
Re: EMI problems Jeff Liebermann <jeffl@cruzio.com> - 2017-06-18 12:49 -0700
Re: EMI problems John Larkin <jjlarkin@highlandtechnology.com> - 2017-06-18 13:42 -0700
Re: EMI problems Jeff Liebermann <jeffl@cruzio.com> - 2017-06-18 15:50 -0700
Re: EMI problems John Larkin <jjlarkin@highlandtechnology.com> - 2017-06-18 17:15 -0700
Re: EMI problems upsidedown@downunder.com - 2017-06-19 09:39 +0300
Re: EMI problems upsidedown@downunder.com - 2017-06-19 09:48 +0300
Re: EMI problems Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-06-19 12:45 -0400
Re: EMI problems "John Miles, KE5FX" <jmiles@gmail.com> - 2017-06-16 15:30 -0700
Re: EMI problems John Larkin <jjlarkin@highland_snip_technology.com> - 2017-06-16 18:10 -0700
Re: EMI problems Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-06-17 11:08 -0400
Re: EMI problems upsidedown@downunder.com - 2017-06-17 14:25 +0300
Re: EMI problems Jeff Liebermann <jeffl@cruzio.com> - 2017-06-17 09:35 -0700
Re: EMI problems John Larkin <jjlarkin@highlandtechnology.com> - 2017-06-17 10:42 -0700
Re: EMI problems upsidedown@downunder.com - 2017-06-17 14:45 +0300
Re: EMI problems John Larkin <jjlarkin@highlandtechnology.com> - 2017-06-17 08:28 -0700
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