Does anyone know what would cause this to happen : In my apt, I've got my monitor set up so that it's in my living room, theres a 'window' to the kitchen where I have my Microwave. They are around 5' apart. When I turn my microwave on I get a noticable shaking on my screen. It only has happpened with my new monitor ( Dell - Sony Trinitron 19" model M991). Do I have anything to worry about as far as ruining the display ?
tia ,
jason bean
-- ((¯`'·.¸(¯`'·.((¯`'·.¸ * jason bean* ¸.·'´¯))¸.·'´¯)¸.·'´¯)) For me , said Sherlock Holmes, "there still remains the cocaine bottle," and he reached his hand up for it. http://home.cogeco.ca/~jabean http://musicpage.kicks-ass.org/
There's no real danger of doing any permanent damage to the screen, when you move the monitor away from the powerful alternating magnetic field the shaking should stop. Its just pulling the beams about inside the CRT. The field is of course spherical in shape and its strength decreases in proportion to the inverse of the square of the distance from the oven so just another foot or so might be enough to stop the shivers. Try it! Pete
Your microwave generates a strong magnetic field (and to a lesser degree your house wiring), which can deflect the monitor's electron beam(s). Some monitors (and microwaves) are better shielded than others. It won't do permanent damage, but it can be a nuisance. It may be more or less noticable on some display modes.
|jason b wrote: |> Does anyone know what would cause this to happen : |> In my apt, I've got my monitor set up so that it's in my living room, |> theres a 'window' to the kitchen where I have my Microwave. They are |> around 5' apart. When I turn my microwave on I get a noticable shaking |> on my screen. It only has happpened with my new monitor ( Dell - Sony |> Trinitron 19" model M991). Do I have anything to worry about as far as |> ruining the display ? |> |> tia , |> |> jason bean |> | its most likely a voltage drop problem and i don't think its a good |idea to operate your monitor that way. many things in your monitor are |designed to operate at the correct voltage other wise, you may get |area's in the monitor that will actually run hotter than it should due |to improper voltages causing circuits to go off the lim.. | i would sugguest getting a UPS for your computer and Monitor. | It won't be voltage drop. Just EMI, maybe RFI. Just move them apart a little more, or don't try to read the computer screen while cooking:-)
I doubt that it's doing any damage; however, the screening on the microwave is probably not much good. Hopefully nobody wears a pacemaker in that house.
A new microwave would be far cheaper than an (unnecessary in this case) UPS.
Cheers, Alan
It's normal. Move them further apart.
N
its most likely a voltage drop problem and i don't think its a good idea to operate your monitor that way. many things in your monitor are designed to operate at the correct voltage other wise, you may get area's in the monitor that will actually run hotter than it should due to improper voltages causing circuits to go off the lim.. i would sugguest getting a UPS for your computer and Monitor.
The magnetic field from the microwave, and possibly to a smaller degree, the electrical wiring near the microwave that is supplying it, is creating a magnetic field that the particular monitor is sensitive to. This will not have a permanent effect on the monitor, but would be annoying to someone like me.
If you move them a few more feet apart, you will see the effect decrease.
If you were to have an LCD type screen, there would be no effect from magnetic fields, unless they were excessively strong.
--
Jerry G. ======
Does anyone know what would cause this to happen : In my apt, I've got my monitor set up so that it's in my living room, theres a 'window' to the kitchen where I have my Microwave. They are around 5' apart. When I turn my microwave on I get a noticable shaking on my screen. It only has happpened with my new monitor ( Dell - Sony Trinitron 19" model M991). Do I have anything to worry about as far as ruining the display ?
tia ,
jason bean
-- ((¯`'·.¸(¯`'·.((¯`'·.¸ * jason bean* ¸.·'´¯))¸.·'´¯)¸.·'´¯))
For me , said Sherlock Holmes, "there still remains the cocaine bottle," and he reached his hand up for it.
If the supply voltage was reduced to a CRT type monitor, the image size would start to decrease, and the picture may have some blooming with the increase of brightness. What is being described here, is the common effect of a strong magnetic field to the mask and the deflection system of a CRT.
--
Jerry G. ======
its most likely a voltage drop problem and i don't think its a good idea to operate your monitor that way. many things in your monitor are designed to operate at the correct voltage other wise, you may get area's in the monitor that will actually run hotter than it should due to improper voltages causing circuits to go off the lim.. i would sugguest getting a UPS for your computer and Monitor.
More likely a magnetic interference problem from the large power transformer in the microwave.
It isn't harmful except to your sanity. :)
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5 feet away?
The only thing in the microwave that would generate a strong AC magnetic field would be the HV transformer. I've no direct experience with microwave transformers, but I have a hard time imagining that they are made so poorly that they have significant fringing magnetic field that far away.
Are they really this poor?
Or is it more likely to be power line interference?
------------------------------------------------ Jim Adney snipped-for-privacy@vwtype3.org Madison, WI 53711 USA
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But from where? The rectifier?
N
to put an example as to why i say voltage drop is from experience. i am not saying that is the problem how ever, i have had monitors and Tv's produce that same effect due to the unit on the same line that wasn't able to maintain the voltage to a minimum required level for the regulator and thus caused strange bending and waving effects in the image. if this is the case, in some designs these effects are not healthy.
that is all i have to say about that one. i just find it hard to believe that 5 feet of space is generating that kind of field, i think i would have second thoughts about where i would be sitting on a regular bases when the nuker was running.
The shaking on the screen could be either caused by the magnetic field caused by the microwave oven (they have large transformers in them) or because of the effect that microwave oven causes to your electrical distribution (microwave oven takes lots of power, can cause noticeable voltage drop on poor wiring etc..). Then there is possiblity of some RFI getting to monitor because of some microwave leakage in your microwave oven...
I don't think you need to worry bout ruining your display much...
-- Tomi Engdahl (http://www.iki.fi/then/) Take a look at my electronics web links and documents at http://www.epanorama.net/
It's a small micorwave. Panasonic I think. Sooner or later it'll get replaced.
jason
I tried this Pete and it seems to be the problem. I moved it towards the screen and it got worse and visa versa. Thanks alot for the help. ;)
j b
You won't ruin the monitor. If it really bugs you get an LCD monitor.
Regards,
Boris Mohar
Got Knock? - see: Viatrack Printed Circuit Designs (among other things)
Not so; you're forgetting the AC power line itself, which obviously is carrying a fairly high current wheneve the microwave is operating. And said power line includes that bit in the wall, which could be directly behind the monitor in question.
From the description, this is almost certainly a magnetic interference problem.
Bob M.
Yes, that's always been my assumption. (Or rather that there's distortion of the AC line waveform where the rectifier conduction turns on and off.) My TV gets "hum bars" on it whenever the microwave is on. The bars are clearly tied to the line frequency. I see 2 "hum bars" per TV frame, so I believe that this indicates 120 Hz. A full wave rectifier would produce a 120 Hz pattern, while a magnetic flux problem would be 60 Hz.
My TV is 15' from the microwave, so I really don't think that it's the leakage flux from the transformer.
------------------------------------------------ Jim Adney snipped-for-privacy@vwtype3.org Madison, WI 53711 USA
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snip
It's hard to believe this is caused by fields from the microwave power transformer which has a ferromagnetic core for the express purpose of containing the field within a closed magnetic path of least resistance. Yes, there is some magnetic field leakage but for the transformer to be efficient that must be kept small. There is also, during the on cycle, a countering field generated by the transformer's load.
In addition, isn't the whole thing encased in steel? The only magnetic leakage would be through the internal micowave window and the microwave door. An easy test would be to shield that door with steel plate or reorient the microwave.
I think a likely source of magnetic interference would be the wiring in the walls. A microwave oven draws a lot of pulsed current.
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