[Prev][Next][Index][Thread]
Re: john06.jpg
-
To: tesla@pupman.com
-
Subject: Re: john06.jpg
-
From: Terry Fritz <terryf@verinet.com>
-
Date: Tue, 22 Sep 1998 12:50:48 -0600
-
Approved: terryf@verinet.com
-
In-Reply-To: <9809221647.AA23814@us8rmc.bb.dec.com>
Hi Gary,
At 12:47 PM 9/22/98 EDT, you wrote:
>From : Gary Lau 22-Sep-1998 1223 <lau@hdecad.ENET.dec.com>
>
>Hi Terry:
>
>I'm looking at the scope traces you posted at:
>www.peakpeak.com/~terryf/tesla/misc/, in particular john02 and john06.jpg.
>
>Perhaps my confusion is partly due to not being clear on what the top
>trace is. In john02, I'm guessing it's primary current, while john06 is
>primary capacitor voltage?
The top trace in john02.jpg is the voltage across the primary inductor at
10kV/div. The top trace in john06.jpg is across the primary capacitor also
at 10kV/div. I didn't make it clear that I had change the probe to the
primary cap in this picture.
>
>Anyway, the unusual thing is that in both photos, the primary seems to be
>ringing at Fres, AFTER QUENCH. I would have expected the primary to be
>dead-quiet after quench. Is this real, or is this just some measurement
>crosstalk?
The primary voltage you see after quench is due to the secondary energy
creating a voltage back on the now open primary by transformer action.
There is some load from the input filters in my coil which is about 10k
ohms resistive in series with a 2.7nF cap. The effects of this load are
not straight forward. This load probably helps to reduce the voltage on
the open gap which aid the quenching. There is a lot more to this subject :-)
>
>Regards, Gary Lau
>Waltham, MA USA
>
>