I just posted a link to Acton & Swift
Neale is here (download a pdf and read online) :
http://www.archive.org/details/ColdCathodeTubeCircuitDesign
Glowlamp manual is here:
http://www.scribd.com/doc/34672942/General-Electric-Glow-Lamp-Manual-2nd-Edition
Any more links folks?
On the yahoo site we had a book/magazine section - how can that best be
arranged with google?
Grahame
On 18/02/2012 11:47, Dekatron42 wrote:
Michel, have you read the books:
Cold Cathode Discharge Tubes by Acton& Swift
Cold Cathode Tube Circuit Design by D M Neale
Glimmröhren und Kaltkatoden-Relaisröhren by Otto Paul Herrnkind
Glowlamp Manual by General Electric
Kaltkatodenrelaisröhren Dekadenzählröhren by DR Roland Hübner
Kaltkatodenröhren by Greiff
Electronic Counting Circuits Techniques& Devices by MULLARD
Ziffernanziegeröhren by VALVO
There is a lot about what happens inside a cold cathode tube in those
books with explanations about charge, deionization and stuff - way
above my head but it gave me a good ground to stand on when trying to
understand more about what happens inside these tubes, and it was
enough for me to understand it at a basic level.
There are of course many more books that describe these phenomena, but
those are the ones that I have borrowed from libraries and looked
into.
/Martin
On 18 Feb, 11:56, Cobra007<[email protected]> wrote:
I think you're right and that would explain why I can't really measure
the capacitive component. You're talking about negative resistance, I
had not looked at it that way but it sounds very reasonable, the
voltage over the tube will decay while the resistance increases so
that would indeed be negative.
I do indeed use a pulse with series resistor, I let the voltage drop
from say 150V down to say 100V to turn the tube off. Normally, with a
capacitive load, the tube's cathode would then immediately drop to
-50V. This doesn't happen, it doesn't even go below 0V most likely
because the negative resistance wins over the capacitive properties.
I think the inductive component is very small. At some frequency it
should resonate I would assume but I can't see that in my step
response so the inductance must be very very small.
Michel
On Feb 18, 1:51 am, John Rehwinkel<[email protected]> wrote:
How does a nixie behave in the first few hundred micro seconds after
switching off. Is it resistive, capacitive or inductive? I would
assume it to be capacitive but that is not exactly what I measure.
That's a really good question, and I'll admit I haven't attempted to measure
it. So, in the grand tradition, I'll take a guess at it. Said guess is that
the plasma stays ionized for a bit before the atoms settle back down to ground
state, so it would have the electrical properties of an ionized plasma, which
would be: negative resistance. This would decay to capacitance as the gas
became nonconductive. there's of course inductance from the leads, and the
capacitance and inductance are distributed (especially in larger nixies),
making a sort of sloppy transmission line with varying characteristics. Now I
want to see if various nixies have resonant frequencies, and what I'd get back
if I hooked a TDR to a really big one.
It
seems more resistive, so I am wondering if this is normal or am I
doing something wrong?
I'm curious as to how you're measuring this in the first place. Are you using
pulses with a trailing voltage and a series resistance, or what?
- John- Dölj citerad text -
- Visa citerad text -
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