While there may be some sort of signal that indicates the start (or end) of
a vector scan sequence, it is not a fixed frequency sync signal as used
with a raster scan display.
If I remember the HP 8566B displays correctly, the vector display refresh
rate is not constant. The refresh rate depends on the amount of information
displayed on the screen. There is a certain rate at which vectors can be
"painted". All vectors are painted before starting over. So if there are a
lot of vectors to paint, it takes a longer time to repeat the painting
sequence.
A way around of the problem of conversion of vector to VGA conversion might
be to use a digital oscilloscope that has X-Y input capability (plus
blanking) and VGA output. A vector to VGA converter might be so specialized
(and thus expensive) that a digital 'scope might be easier and cheaper to
implement.
An alternate method would be to do a automated, repeated dump to computer
of the signal scan from the sweep data buffer of the 8566B and display it
on a computer monitor. Not quite real time, but this might be usable. This
would be a bit of work because all the auxiliary vectors (graticule,
notations, markers, etc) would need to be reconstructed.
Don Borowski
Schweitzer Engineering Labs
Pullman, WA, USA
John Woodgate
<[email protected]
o.uk> To
Sent by: [email protected]
[email protected] cc
Subject
04/09/2007 09:08 Re: HP XYZ Ploter to VGA converter
AM
In message
<2376b63a5af8564f8a2a2d76bc6db03301f4c...@cinmlvem11.e2k.ad.ge.com>,
dated Mon, 9 Apr 2007, "Garnier, David S (GE Healthcare)"
<[email protected]> writes:
>Does anyone know of an X-Y-Z-Blank Vouts converter to a VGA converter
>box?
>
>(( Looking to hang a LCD projector on our old HP 8566B for remote
>viewing. ))
You would need another signal in order to synchronize the display with
the analyser scan. If the analyser has a 'pen down' output for a
plotter, that would allow a synch signal to be constructed. The blanking
signal might serve, but perhaps not.
--
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
There are benefits from being irrational - just ask the square root of 2.
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
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