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G90 image placement on raster

 
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KrisRoberts



Joined: 21 Jan 2007
Posts: 115
Location: San Diego

Posted: Fri Sep 17, 2010 6:10 am    Post subject: G90 image placement on raster

I'm re doing my setup from the ground up and have seen some posts about placing the image on the extreme lower right corner of the raster to avoid ringing.

In the past I have always had my image more or less centered on the raster, and have had a little ringing. So this time I thought I might try it in the corner. But I wanted to make sure that really is the appropriate thing to do.

Looking at it tonight if I move it all the way down and over and then re center the image on the screen the raster does go off the tube face. In normal use there won't be any emission when that area is scanned, so it should be fine to have it off the edge, right?
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CIR Engineering



Joined: 25 Aug 2008
Posts: 4269
Location: Chicago USA & Berlin Germany

Posted: Fri Sep 17, 2010 2:06 pm    Post subject: Re: G90 image placement on raster

KrisRoberts wrote:
I'm re doing my setup from the ground up and have seen some posts about placing the image on the extreme lower right corner of the raster to avoid ringing.

In the past I have always had my image more or less centered on the raster, and have had a little ringing. So this time I thought I might try it in the corner. But I wanted to make sure that really is the appropriate thing to do.

Looking at it tonight if I move it all the way down and over and then re center the image on the screen the raster does go off the tube face. In normal use there won't be any emission when that area is scanned, so it should be fine to have it off the edge, right?

Yeah, that's what I do.

However, don't go to the extreme right because you will get nonlinearity on the right side of the screen. As you shift the image to the right of the rater, look at a cross hatch pattern (or better a circle hatch). As you slide the image to the right you will eventually hit a point where the linearity will start to squish along the right side. Once you see this, back off and shift towards the left again until the nonlinearity goes away. Then go one or tow more clicks back to the left just to be sure.

Also, stay a few clicks from the extreme bottom as well.

craigr

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