Re: Vector Hardware

The DAC08 is performing the linear scaling for the vector generator. the vector counter
can do the binary scaling (preset sizes). But if you want and object to change size
gradually you need the linear scaling.
  If you watch the linear scale test, you see a box growing gradually out of the center. I
think the way is works is that the output of the DAC08 is the input of the AM6012's +ref
or something. Essentially, the DAC is a linear control of the XY DAC's positive rail.
  If you watch the binary scale test, you will see the box jump from on scale factor to
another. It can't do smooth scaling.

I did't thing that Tempest had linear scaling? Am I thinking of the wrong DAC-08?

jess

Mendel Pearl wrote:
>
> Yes! Finally I got my Tempest AVG working again!
>
> The problem turned out to be the MC1495 multipliers, which was a real hard job
> tho find these here in Holland.
>
> My other Tempest board still has a problem with the X defection, the Y is
> working after replacing the current/voltage opamp (TL082) , thanks Rodger! This
> little baby indeed caused the virtual ground to be not 'grounded' :)
>
> Maybe somebody could help me out on this one:
>
> What is the DAC08 doing in the circuit? So far as I can see from the schematics
> and MC1495 datasheets, it seems to me that the MC1495 multipliers perform the
> east-west correction (pincushion).
> As you can see from the circuit, the output current of the DAC08 is directly
> summed to that of the XY DACs.
> Maybe somebody could shine a light here? I am really trying to know how the AVG
> functions exactly...
>
> Thanks!
Received on Fri Nov 12 12:25:30 1999