Re: [TCML] Measuring Amperage in Neon Discharges.

[Henry Hallam <henry@xxxxxxxxxxxxxxxx>]

On Sun, Dec 13, 2009 at 12:26 PM, Harvey Norris <harvich@xxxxxxxxx> wrote:
> Question; Can I simply put a common multimeter in series with a neon tube illuminated by a 30 ma current limited NST secondary, to record that secondaries amperage output?

Yes.  Obviously be careful and treat the meter as "hot", i.e. don't go
near it when power is applied.

>Do I need a special digital meter to do this?

No, an analog meter may even be better.

> ...but where does the idea of a negative resistance occur, if these parameters show the the neon discharge resistance must be in thousands of ohms?

The "negative resistance" refers to the local slope of the V-versus-I
graph.  That is, for part of the graph, a small increase in voltage
results in a small reduction in current, even though the overall
current and voltage are both positive (and R=V/I is several thousand
ohms, as you note)



-- 
Henry Hallam

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