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Groups > sci.electronics.design > #465093
| From | Don Kuenz <g@crcomp.net> |
|---|---|
| Newsgroups | sci.electronics.design |
| Subject | Re: EMI problems |
| Date | 2017-06-21 02:53 +0000 |
| Organization | A noiseless patient Spider |
| Message-ID | <20170620a@crcomp.net> (permalink) |
| References | <gaf3kc5s96hufpak4qqm6avol7g05r27rc@4ax.com> <fnj3kcl2dll3el8nbsnm0tvcbdifmq278e@4ax.com> <21n3kcdugfo0cf3uup7qtp333eri70pmgp@4ax.com> <ohtcqu$2f4$1@dont-email.me> <1ae40009-0204-fa1e-718d-fc736fec43d1@electrooptical.net> |
Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote: > On 06/15/2017 03:28 AM, o pere o wrote: >> On 15/06/17 03:01, John Larkin wrote: >>> On Wed, 14 Jun 2017 20:05:21 -0400, Martin Riddle >>> <martin_ridd@verizon.net> wrote: >>> >>>> On Wed, 14 Jun 2017 16:09:43 -0700, John Larkin >>>> <jjlarkin@highland_snip_technology.com> 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 >>>>> >>>>> The *output* of the amp needs to be around 10 nV/rootHz. >>>>> >>>>> 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. >>>> >>>> You can still get the 'Charles Chips' 1 lb tin. It's a tad bigger if >>>> you need more room. >>>> >>>> Cheer >>> >>> A square can would be better. It's a little weird bolting connectors >>> into the round one. This needs research. >>> >>> >> >> You can get squares... even without filler material! >> >> https://es.aliexpress.com/store/product/Size-180x130x72mm-tin-box-food-tin-can-cookies-box-biscuit-metal-box-gift-container-storage-box/713943_32297655507.html >> >> >> Pere > > For smaller stuff, I have a bin full of unused 70-mm nickel-plated steel > film cans that I got from Surplus Shed. You put the connectors in the > lid. ;) > > Clean paint cans work well too--there's a tea place in Maryland that > ships their teas in them. Empty Altoids tins also work and have an iconic design language. In this case the connectors work best on the side. Altoids jelly bean mixer http://crcomp.net/ee/Altoids%20jelly%20bean%20mixer/ Thank you, -- Don, KB7RPU
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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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