Re: Radio Frequency Interference (Peter Marvit )

Subject: Re: Radio Frequency Interference
From:    Peter Marvit  <marvit(at)CATTELL.PSYCH.UPENN.EDU>
Date:    Wed, 8 Mar 2000 14:57:40 -0500

We also get RFI on occasion through various bit of equipment. So far, we've been unable to completely isolate the source of the problem. Instead, we've taken the engineering approach of fiddling until it goes away. Basically, make sure everything is properly grounded, disconnect unneeded connections from the computer, the lengths of wires/cables are the shortest possible, and critical areas are shielded. We even wrapped sections of cables in aluminum foil and then grounded the foil. We traced one source to an added DIO card in the computer that was connected to a stimulus generation box. I'm sure someone else may have a more precise set of solutions. For us, the problem was both intermittent AND season-related (worse in summer). Good luck, Peter : Peter Marvit, PhD <marvit(at)>, Psychology Dept, Univ. of Penn : : 3815 Walnut St., Philadelphia, PA 19104 phone(+fax):215/898-3460 :

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