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Groups > sci.electronics.design > #464582
| From | Joerg <news@analogconsultants.com> |
|---|---|
| Newsgroups | sci.electronics.design |
| Subject | Re: EMI problems |
| Date | 2017-06-15 12:27 -0700 |
| Message-ID | <eqg5cjF8crpU1@mid.individual.net> (permalink) |
| References | <gaf3kc5s96hufpak4qqm6avol7g05r27rc@4ax.com> |
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? > 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. -- 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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