[neonixie-l] Re: Slightly off topic but still a Neon filled tube: Neva Franck-Hertz tube, help to get it running please!

[Yohan Park]

What have you checked to conclude "the tube seems to work just fine"?
Perhaps too obvious but have you checked with a neon tester to see if 
there's still neon inside?

On Saturday, May 6, 2023 at 6:06:50 PM UTC+2 Dekatron42 wrote:

> I've been able to buy a Neon filled Franck-Hertz tube together with its 
> control unit. Everything looks fine, the output voltages from the control 
> unit are correct and the tube seems to work just fine, however I can't get 
> the experiment to work properly.
>
> Is there anyone here on the forum that can help me out?
>
> I have checked all voltages and used this guide: 
> http://www.bastgen.de/schule/physik/13/Material/Franck-Hertz-Neon.pdf
>
> The control unit can be seen here: 
> https://www.uranmaschine.de/87051.Neva_6751_Franck-Hertz-Roehre_mit_Quecksilber/87051.Neva_6756_Franck-Hertz-Betriebsgeraet_hires.jpg
>
> What I am trying to do is specifically the part where you are supposed to 
> get one or more clusters of neon atoms being excited like in this photo: 
> https://www.leybold-shop.com/media/phk/images/versuche/P6243_Schirmbild.jpg
>
> [image: 
> https://www.leybold-shop.com/media/phk/images/versuche/P6243_Schirmbild.jpg] 
>
>

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[neonixie-l] Re: Slightly off topic but still a Neon filled tube: Neva Franck-Hertz tube, help to get it running please!

[Dekatron42]

Sorry for not writing about what I have checked, it was obvious to me.

I have checked the following:

*. There are no shorts between any pins except the heater connection which 
has a low resistance (can't remember right now though what it measured at 
but it consumes the current stated in the datasheet)
*. There is Neon inside the envelope, and from what it looks when tested 
with a Plasma ball there is a lot of neon, like in a well filled Dekatron
*. The heater works and glows
*. The voltages on the control unit looks ok when tested with a Fluke 87V 
DMM and with both an old analogue HP 1740A and with a more modern Lecroy 
WaveAce 2014

/Martin

On Monday, 8 May 2023 at 14:55:49 UTC+2 Yohan Park wrote:

What have you checked to conclude "the tube seems to work just fine"?
Perhaps too obvious but have you checked with a neon tester to see if 
there's still neon inside?

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