Re: Interupting xenon flash current ?
- From: Spehro Pefhany <speffSNIP@xxxxxxxxxxxxxxxxxxxxxxx>
- Date: Wed, 05 Dec 2007 17:42:00 -0500
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
--
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