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- Path: sparky!uunet!darwin.sura.net!mips!swrinde!zaphod.mps.ohio-state.edu!caen!mtu.edu!abcd.Houghton.MI.US!Jim_Johnson
- From: Jim_Johnson@abcd.Houghton.MI.US (Jim Johnson)
- Newsgroups: comp.sys.ibm.pc.hardware
- Subject: Re: "flicker" and monitors
- Message-ID: <Jim_Johnson.05zu@abcd.Houghton.MI.US>
- Date: 29 Jul 92 13:25:56 GMT
- Organization: Amiga BitSwap Central Dispatch
- Lines: 33
-
- In a message dated Wed 29 Jul 92 4:11, Unruh@physics.ubc.ca (william Unruh
- wrote:
-
- >I think it quite likely that you are seeing a beating effect from the 60
- Hz
- >of fluorescent lights in the store and the refresh frequency of the
- >monitors.
- UU> ...
- UU> Well I thought of that, so I persuaded the shop to let me switch off
- UU> the
- UU> fluorescents, and it did not seem to change the effect. But it did
- UU> look
- UU> like some kind of beating to me. Yes, I really see it chiefly with
- UU> very
- UU> light colors ( the white of the Windows desktop is a good one), and
- UU> it
-
- So much for theory #1 - Now for theory #2:
- Electromagnetic Interference (EMF) - I once took an introductory course in
- AutoCAD at our local high school. There was an entire row of identical
- SVGA monitors - and mine was the only one with a noticible flicker. I
- talked to the instructor who informed me that it wasn't the monitor, but
- the location. They had swapped several monitors into that workstation with
- the same result. Turned out there was a "noisy" electric circuit in the
- wall behind that workstation - all the other monitors were just far enough
- away for the effect to disappear.
-
- Florescent lights are the culprit more often, but it could also be EMF.
-
- -- Via DLG Pro v0.995
-
- Jim Johnson-
- *** Remember, they're only tools - Not a way of life! ***
-