Experimental Physics and
Industrial Control System

Korhonen Timo <[email protected]> · Thu, 4 May 2000 08:45:19 +0200 (MEST)

Hi Garrett,

(I copied this to tech-talk also in case it is of wider interest.)

On Wed, 3 May 2000, Garrett D. Rinehart wrote:

> I need a device which will output a pre-programmed function... just one cycle... 
> each time it receives an external trigger. The function covers about 18mS and is 
> repeated (triggered) at a 30Hz rate. Anybody got such a device? If so, I'd 
> really like to hear from you.
> 
> I think this may be what Timo Korhonen is using with the recently 
> much-talked-about aao probelm(s). If so, Timo, can you tell me what you have?

What I have is a Joerger VWG 100 MHz, 12-bit arbitrary waveform (or
function) generator. It has a 256 kword memory (other memory options are
available) for storing a waveform and can be triggered both externally and
internally (from software). There are several trigger options, but the
basic mode would do what you want (trigger at 30 Hz). 
The card accepts an external clock up to 100 MHz and also has an internal
100 MHz clock. The clock can be divided internally to get slower rates.

We use this card to drive an excitation kicker in our tune measurement
setup. The functions are calculated externally and downloaded to the
waveform generator. 

I believe this card could do what you describe. But if you dont need the
100 MHz bandwidth, then the other solutions that have been posted in reply
to your question might be more attractive and the Epics support for those
is probably more mature. But I am of course willing to help you if you are
interested.

I hope this helps.

best regards,
		Timo

Timo Korhonen  PSI (Paul Scherrer Institut), SLS 
               CH-5232 Villigen PSI 
               tel + 41- 56 3103262  fax + 41 - 56 310 3151 
e-mail:	       [email protected]

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System