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can a CRT function on it's side?
I was in an MRI clinic and noticed that the monitors were set up tall
and narrow. They weren't just turned on their sides, they were made this way. This was to better view spinal column images. I thought this would be great for me, a musician, as I could better view sheet music. I tried turning my 19" crt 90 deg, but it messed up the color and the focus. Are there certain crt designs that would function on their sides? I imagine LCDs would work this way, but I don't want to spend the money. Why did I have this problem? How it it that an electron beam would be affected by gravity? Robobass |
can a CRT function on it's side?
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can a CRT function on it's side?
I think it should be OK if it's turned on while on it's side, so the deguass
circuit does it's thing. I have seen large (25" and up) CRT's react poorly to being moved while ON. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "robobass" wrote in message om... I was in an MRI clinic and noticed that the monitors were set up tall and narrow. They weren't just turned on their sides, they were made this way. This was to better view spinal column images. I thought this would be great for me, a musician, as I could better view sheet music. I tried turning my 19" crt 90 deg, but it messed up the color and the focus. Are there certain crt designs that would function on their sides? I imagine LCDs would work this way, but I don't want to spend the money. Why did I have this problem? How it it that an electron beam would be affected by gravity? Robobass |
can a CRT function on it's side?
On Wed, 28 Jan 2004 12:07:56 +0000, Tim Mitchell
wrote: In article , John Bachman writes On 28 Jan 2004 02:59:49 -0800, (robobass) wrote: I was in an MRI clinic and noticed that the monitors were set up tall and narrow. They weren't just turned on their sides, they were made this way. This was to better view spinal column images. I thought this would be great for me, a musician, as I could better view sheet music. I tried turning my 19" crt 90 deg, but it messed up the color and the focus. Are there certain crt designs that would function on their sides? I imagine LCDs would work this way, but I don't want to spend the money. Why did I have this problem? How it it that an electron beam would be affected by gravity? Robobass When you turn a CRT on it's side the convergence is disturbed by the change in direction of the earth's magnetic field. You could do it with an LCD or plasma display but not a magnetic deflection device such as a CRT. If you degauss the CRT once it is on its side, normal operation should be restored. I don't think that degaussing will do the trick. Degaussing removes residual magnetism within and around the CRT itself but has no effect on the earth's magnetic field. Guess I will do a little test later today just to make sure. John |
can a CRT function on it's side?
Back in the mid 1980s Apple and at least one other mfg made monitors that
could be rotated for working on legal sized documents. I see no reason why can't use yours rotated 90 degrees. Look for a deguass butoon or try turning it on and off several times. 73 hank wd5jfr "robobass" wrote in message om... I was in an MRI clinic and noticed that the monitors were set up tall and narrow. They weren't just turned on their sides, they were made this way. This was to better view spinal column images. I thought this would be great for me, a musician, as I could better view sheet music. I tried turning my 19" crt 90 deg, but it messed up the color and the focus. Are there certain crt designs that would function on their sides? I imagine LCDs would work this way, but I don't want to spend the money. Why did I have this problem? How it it that an electron beam would be affected by gravity? Robobass |
can a CRT function on it's side?
Normally a CRT cannot be directly put in its side and work directly. If you
can find someone who is knowledgeable to redo the convergence and purity set-up for this type of operation it will work for you. The mask in the CRT would have to be degaussed on its side before doing the re-alignment of the purity and convergence set-up. A number of years ago, Apple came out with a CRT monitor that can be rotated. The CRT had a very good u-metal shielding, and they used some sophisticated alignment circuits in their design to compensate the purity and convergence for this. I had a look at one of these a number of years ago. I found that when it was on its side, it was not very perfect, but it was better than the average when run this way. This was not done simply. Even if you had your monitor aligned to work on its side, you will have to have the software for this, or your computer will be on the difficult side to use. There are some LCD monitors that are designed to be able to be rotated on its side. A descent monitor with this feature that is very good is the Samsung SyncMaster 171N. This one can be rotated to work at any angle from 180 deg (normal) to 90 deg (side). This monitor comes with the software to accommodate this. -- Greetings, Jerry Greenberg GLG Technologies GLG ========================================= WebPage http://www.zoom-one.com Electronics http://www.zoom-one.com/electron.htm ========================================= "robobass" wrote in message om... I was in an MRI clinic and noticed that the monitors were set up tall and narrow. They weren't just turned on their sides, they were made this way. This was to better view spinal column images. I thought this would be great for me, a musician, as I could better view sheet music. I tried turning my 19" crt 90 deg, but it messed up the color and the focus. Are there certain crt designs that would function on their sides? I imagine LCDs would work this way, but I don't want to spend the money. Why did I have this problem? How it it that an electron beam would be affected by gravity? Robobass |
can a CRT function on it's side?
On Wed, 28 Jan 2004 08:29:51 -0600, "Henry Kolesnik"
wrote: Back in the mid 1980s Apple and at least one other mfg made monitors that could be rotated for working on legal sized documents. I see no reason why can't use yours rotated 90 degrees. Look for a deguass butoon or try turning it on and off several times. Those were monochrome monitors - the change in magnetic field would cause a positional shift but convergence was not a problem. In that time period I was designing monitors for a large computer company. We shipped a new color monitor design to our folks in Australia and were puzzled when they reported that the convergence was off. I could hardly believe it when we found that the convegence problem was caused by the difference in the Earth's magnetic field between Australia and the US. A happy discovery was that if you break the field into vertical and horizontal components the horizontal is nearly identical but the vertical is nearly identical in magnitude but opposite in direction. So our solution was to turn the monitors upside down when aligning them here - then they were fine right side up in Australia. Those were low-resolution monitors. I doubt that the upside down trick would be adequate for today's monitors. Monitor manufacturers today use a controlled magnetic field room in which they can create the magnetic field for any place on earth. They set it up, align the monitors and ship the units to the right place. John |
can a CRT function on it's side?
This thing with the monitors going to Australia was very amusing! This was
a very smart idea to align them upside-down! -- Greetings, Jerry Greenberg GLG Technologies GLG ========================================= WebPage http://www.zoom-one.com Electronics http://www.zoom-one.com/electron.htm ========================================= "John Bachman" wrote in message ... On Wed, 28 Jan 2004 08:29:51 -0600, "Henry Kolesnik" wrote: Back in the mid 1980s Apple and at least one other mfg made monitors that could be rotated for working on legal sized documents. I see no reason why can't use yours rotated 90 degrees. Look for a deguass butoon or try turning it on and off several times. Those were monochrome monitors - the change in magnetic field would cause a positional shift but convergence was not a problem. In that time period I was designing monitors for a large computer company. We shipped a new color monitor design to our folks in Australia and were puzzled when they reported that the convergence was off. I could hardly believe it when we found that the convegence problem was caused by the difference in the Earth's magnetic field between Australia and the US. A happy discovery was that if you break the field into vertical and horizontal components the horizontal is nearly identical but the vertical is nearly identical in magnitude but opposite in direction. So our solution was to turn the monitors upside down when aligning them here - then they were fine right side up in Australia. Those were low-resolution monitors. I doubt that the upside down trick would be adequate for today's monitors. Monitor manufacturers today use a controlled magnetic field room in which they can create the magnetic field for any place on earth. They set it up, align the monitors and ship the units to the right place. John |
can a CRT function on it's side?
"John Bachman" wrote in message ... On Wed, 28 Jan 2004 12:07:56 +0000, Tim Mitchell wrote: In article , John Bachman writes On 28 Jan 2004 02:59:49 -0800, (robobass) wrote: I was in an MRI clinic and noticed that the monitors were set up tall and narrow. They weren't just turned on their sides, they were made this way. This was to better view spinal column images. I thought this would be great for me, a musician, as I could better view sheet music. I tried turning my 19" crt 90 deg, but it messed up the color and the focus. Are there certain crt designs that would function on their sides? I imagine LCDs would work this way, but I don't want to spend the money. Why did I have this problem? How it it that an electron beam would be affected by gravity? Robobass When you turn a CRT on it's side the convergence is disturbed by the change in direction of the earth's magnetic field. You could do it with an LCD or plasma display but not a magnetic deflection device such as a CRT. If you degauss the CRT once it is on its side, normal operation should be restored. I don't think that degaussing will do the trick. Degaussing removes residual magnetism within and around the CRT itself but has no effect on the earth's magnetic field. Guess I will do a little test later today just to make sure. John Try it, it works fine, when I had a smaller monitor I used to turn it on it's side regularly to play vertical monitor games with MAME. Anyone remember those old Radius Pivot monitors? They were designed so you could rotate them 90 degrees and the software would detect that and flip the image. Also arcade monitors for horizontal and vertical orientation are the same monitor, just mounted differently. As long as you degauss it in it's new orientation it'll work perfectly. |
can a CRT function on it's side?
Even if you had your monitor aligned to work on its side, you will have to have the software for this, or your computer will be on the difficult side to use. IIRC the ATI Radeon drivers let you do this. As an experiment I just tried running my Sony 22" CRT on it's side, after degaussing the image looked fine (but sideways) |
can a CRT function on it's side?
Others mentioned the electromagnetic issues relating to turning the CRT on its side. There is one other issue and that is convective thermal cooling of the remaining circuitry in the monitor. That is, the ol' "heat rises" principle and that's how the heat exits the monitor, through the top. It's likely that some circuits could run hotter because there may not be cooling vents on the side of the monitor enclosure. A cheap fan of any type would probably remedy the problem though. b. |
can a CRT function on it's side?
"James Sweet" wrote in message news:CSRRb.133168$5V2.675975@attbi_s53...
Even if you had your monitor aligned to work on its side, you will have to have the software for this, or your computer will be on the difficult side to use. IIRC the ATI Radeon drivers let you do this. As an experiment I just tried running my Sony 22" CRT on it's side, after degaussing the image looked fine (but sideways) Monitors/tv sets are normally set up for the "average" magnetic field in the northern hemisphere unless they are known to be going to a location in the southern hemisphere. When a tv/monitor is operated on its side, the earth's magnetic field has the greatest effect on the purity, and somewhat lesser effect on the convergence. Degaussing will help the purity, but may not be 100% effective. If the purity must be manually readjusted, then the convergence usually must also be readjusted. LCDs are the way to go if you want to be able to switch back and forth without any extra problems. H. R. (Bob) Hofmann |
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