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| To: | <[email protected]> |
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| Subject: | Re: LF: Noise R75 - rs232 from smpsu - |
| From: | "James Moritz" <[email protected]> |
| Date: | Wed, 4 Aug 2010 10:21:40 +0100 |
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| Sender: | [email protected] |
Dear Laurence, LF Group,----- Original Message ----- From: "Alan Melia" <[email protected]> To: <[email protected]> Sent: Tuesday, August 03, 2010 11:35 AM Subject: Re: LF: Noise R75 - rs232 from smpsu - Hi Laurence I have found some problems with the "two wire" versions wherethe powered instrument has no proper ground connection....VLF receivers etc. But often this can be cured by grounding one side of the low-voltage output. My experience would agree with Alan - several times with laptops, and also a "compact" desktop with external PSU, making a direct connection between the mains ground and the chassis of the computer has made a substantial noise reduction. It seems to be fairly common that there is no ground continuity between input and output of PSU. With no ground connection to the output side of the PSU, any common-mode noise due to the PSU has to find its way to earth via the RF connections usually, and can get into the signal path in the process. Winding as many turns as possible of the DC output lead round a large split ferrite core can also be helpful in reducing the noise current. I find >10 turns are needed to make a useful difference. Cheers, Jim Moritz73 de M0BMU |
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