From: "Terrell W. Fritz"
Date: Fri, 13 Sep 2002 20:17:28 -0600
Subject: Re: [TSSP] Top Voltage
Hi Again.
I replaced the resistor in the sensor head with a 0.1 ohm. It did not change
things much except the levels.
http://hot-streamer.com/temp/PaulArc/020913-1/Tek00000.gif
So 1A = 2.44mV now. or 10mV = 4.1A
The head now has an impedance of 0.1 ohms too which cleans things up a bit. We
still see a 4 amp spike and all but the ring down following it is more clear.
Probably something real there.
Here is a backed off view of the thing:
http://hot-streamer.com/temp/PaulArc/020913-1/Tek00001.gif
One big spike and many little spikes.
Here is a closer especially active burst:
http://hot-streamer.com/temp/PaulArc/020913-1/Tek00002.gif
I turned up the power (the meter froze so don't know the voltage. Probably
proportional to base current) the spikes started going UP!!
http://hot-streamer.com/temp/PaulArc/020913-1/Tek00003.gif
Firing on the first high voltage peak now which is opposite in polarity.
http://hot-streamer.com/temp/PaulArc/020913-1/Tek00004.gif
As I continued to turn it up, this spike just gets bigger and bigger. 100mV =
41 amps!!
http://hot-streamer.com/temp/PaulArc/020913-1/Tek00005.gif
http://hot-streamer.com/temp/PaulArc/020913-1/Tek00006.gif
So it appears these arcs are just single very short bursts of energy at this
level. I tired to get a nice picture but catching a 50nS event is really
really hard ;-)) Maybe I can get it on video...
An hour later........
Ok, this is the best I could do at catching some of the higher power shots...
http://hot-streamer.com/temp/PaulArc/020913-1/Image10.jpg
Cheers,
Terry
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.