Re: Interupting xenon flash current ?

Spehro Pefhany speffSNIP@xxxxxxxxxxxxxxxxxxxxxxx posted to
sci.electronics.design:

On Wed, 05 Dec 2007 16:48:10 -0500, Mike <nomtrxspam@xxxxxxxxxxx>
wrote:


I believe there is a mistake with your measurement. In the common
cameras, the flash current is at the order of 100A and the duration
is ~tens of milliseconds. They handle it with IGBT of SOT-223 form
factor.

However there are the special pulse tubes for use with lasers, etc.
They have higher rate of the current increase and the shorter flash
duration.


Vladimir Vassilevsky
DSP and Mixed Signal Design Consultant
http://www.abvolt.com

That was my frst reaction also since I expected to see something
less than 400A, but I can't find any reason for such a major error.
I have a 200mv 200A shunt in series with the tube and am simply
grabbing the voltage waveform across the shunt with an HP 54502A
storage scope. So with 1mv/A and reading 1.9v peak that's 1900A. I
connected the 1V scope calibrator output from an analog scope to
54502s input and it reads right on amplitude and time.

Mike
If there is no absolute truth then nothing can be known.

Well, if that's what the 'scope shows, it's *got* to be true.


Best regards,
Spehro Pefhany

My tongue would hurt after that.

.

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