Re: Electrostatic deflection?

Are you sure the 12" isn't a Digital Storage Oscilloscope? These
are basically a raster monitor with a LOT of digitizing circuitry in
between. A giveaway is if it has a connector on the back for an
external monitor (like the Tektronix 460 series does).

Zonn wrote:

> On Fri, 22 Oct 1999 08:57:27 -0400, you wrote:
>
> >
> >I fully admit that I'm out of my league in these discussions...don't
> >let these musings slow anyone down...
> >
> >I was thinking about the yoke issue, and am wondering if it's
> >feasable to modify a vector (or raster) monitor to do electrostatic
> >deflection. I think this is what oscilloscopes do.
> >
> >I can see a nice, simple assembly of four plates replacing a yoke,
> >but I'd imagine you would need higher voltages to acheive decent
> >deflection. After all, oscilloscope tubes are long and skinny.
> >I think the nice part would be driving a high impedance instead of a
> >low one...
> >
> >Is this possible or am I just dreaming? ;)
>
> It works great, though I think the plates would have to be inside the
> glass, the closer to the beam the more effect on it's travel. I
> believe the charge on the plates will be subject to the inverse square
> law, though I could be wrong about that.
>
> I have two X/Y monitors at home, one (an Tektronics) with about a 6"
> diagonal screen and the other (an HP) with a 12". It's a *great* way
> to run a B&W vector game, if you build an adaptor for the Z
> (intensity) channel. The slew rate is *way* beyond that of a typical
> yoke. More like a scope.
>
> The 6" monitor is about 2 feet long, but the 12" is built like a small
> TV. They must use higher voltages for deflection to keep the tube
> short. (To tell the truth, the I've never seen the 12" work, it has a
> high-voltage problem I didn't have time to get into before everything
> went into storage. I do have the full schematic and specifications
> for it though.)
>
> -Zonn
Received on Fri Oct 22 15:31:29 1999