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Home -> Community -> Mailing Lists -> Oracle-L -> Re:RE: FW: Electrical background
Ross,
You've got to define hum. A relay that is run off of an AC current can have a VERY faint hum. A relay that is running on AC current when designed for DC current has a distinctive 'hum' sometimes more similar to a high speed clicking. Also a relay that has a coil nearing the end of it's life will 'hum' as defined before. The best test I know of in this case is to observe the relay's contacts (possible only on open frame relays) in the dark. If there is a faint arc visible when the relay is suppose to be closed, it's time for a replacement.
Dick Goulet
BTW: Definition of 'VERY faint' is in a closed almost sound proof room with your ear right next to the relay.
____________________Reply Separator____________________ Author: "Mohan; Ross" <MohanR_at_STARS-SMI.com> Date: 1/24/2002 7:15 AM
Is it natural for relays to hum?
-----Original Message-----
SO, what did you want?
Dick Goulet
Ancient Electronics Tech & tinkerer, Also certified relay NUT
____________________Reply Separator____________________ Author: "Adams; Matthew (GEA; 088130)" <MATT.ADAMS_at_APPL.GE.COM> Date: 1/23/2002 10:30 AM
Sorry folks, that went to the wrong list. I apologize. We now return you to
your
regularly scheduled Oracle discussion.
> -----Original Message-----
> From: Adams, Matthew (GEA, 088130)
>
>
> Anybody got a EE or electronics background?
> I've got a question about relays.
> ----
> Matt Adams - GE Appliances - matt.adams_at_appl.ge.com
-- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Mohan, Ross INET: MohanR_at_STARS-SMI.com Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: INET: dgoulet_at_vicr.com Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).Received on Thu Jan 24 2002 - 16:31:52 CST
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