On 12 Dec 2004 at 12:06, Frits Wüthrich wrote: > Single pulse on the scope, no oscillator, and you can actually see the shape > of > the pulse and use the time scale of the oscilloscope to determine the pulse > duration. The problem is triggering the scope. You might trigger it with the > same camera contact used to trigger the flash, that is probably the easiest > thing. You also get to see the delay of the flash.
I would suggest that using the flash contacts rather than a fast photoreceptor as the point of measurement will lead you to erroneous measurements if your concern is flash duration. Measuring at the contacts takes no account of the trigger circuit response and the quench circuitry latency. A flash emits such a high intensity light burst that a simple LED pointed a the flash reflector will provide sufficient voltage to trigger any decent scope. Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
