Thats amazing, it fits to the theoretical curve perfectly! Nice test, thank you!
--- original message --- On November 13, 2020, 3:46 AM GMT+1 ka...@scarletmail.rutgers.edu wrote: In light of Dalibor's curiosity about the townsend effect and accelerating electrons pre ignition, I attempted to make this measurement. In the previous measurements, the smu measurement was set manually to the 10 millamp range. This time, it was set to "auto" to capture lower values. Bear in mind that I am not fully utilizing the 100 femptoamp resolution of the smu, as the connections to the nixie are not guarded. This means that the leakage from the insulation of the wires will raise the noise floor to the sub-nanoamp range. If I want to extend the noise floor of the current measurement and get the full current resolution of the smu instrument, triaxial leads and a special test fixture are required to guard the connections from both leakage and even the slightest EMI from the atmosphere. Nevertheless, the attached measurement shows a snapshot at the highest digital sampling fidelity this instrument can manage. Even in the relatively high noise floor as explained above, you can see the current begin to rise right before ignition. Pretty cool! > On Thu, Nov 12, 2020 at 1:37 PM Dalibor <dali...@farny.cz> wrote: >> Thank you for making this test, Kevin! Nice to see the tubes passed :-) >> It is interesting, that the current jumps from zero straight to milliamps >> scale - theoretically there should be a small current (10E-5 - 10E-6 A) >> flowing at the voltage close to the striking one (Townsend discharge). The >> voltage is not yet enough to create a self-sustaining glow, but high enough >> to accelerate the free electrons towards the anode, creating a measurable >> current. I normally work with instruments not sensitive enough for this >> test, so I never tried.. >> Regards! >>> On Wednesday, 11 November 2020 at 23:15:04 UTC+1 gregebert wrote: >>>> I had to generate that data by hand measurements....talk about tedious. >>>> Your measurements confirmed what I saw as well: the ionization and >>>> extinguishing voltages are pretty close to eachother. Generic neon bulbs >>>> have much higher hysteresis. >>>> I was not able to determine any significant difference in ignition voltage >>>> for a dark vs illuminated room. >>>> It would be good to see if there are any changes after the tubes have been >>>> in-service for awhile, say yearly checkups. >>>> I'm still waiting to get back on my feet so I can get my clock finished. >>>> They are magnificent tubes. >>>>> On Wednesday, November 11, 2020 at 1:50:35 PM UTC-8 Jon wrote: >>>>>> Thanks Kevin, this is really interesting stuff! >>>>>> Jon. >>>>>>> On Wednesday, November 11, 2020 at 9:03:43 PM UTC Kevin A. wrote: >>>>>>>> By the way, if you find the SMU instrument interesting, I wrote a >>>>>>>> detailed article about what it is, and how it is used: >>>>>>>> https://neonkev.com/2020/09/21/precision-swiss-army-knife-the-smu-source-measure-unit/ >>>>>>>>> On Wednesday, November 11, 2020 at 4:01:23 PM UTC-5 Kevin A. wrote: >>>>>>>>>>> On Wednesday, November 11, 2020 at 4:01:01 PM UTC-5 Kevin A. wrote: >>>>>>>>>>>> Some pics of the test setup >> -- >> You received this message because you are subscribed to the Google Groups >> "neonixie-l" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to neonixie-l+unsubscr...@googlegroups.com. >> To view this discussion on the web, visit >> https://groups.google.com/d/msgid/neonixie-l/0bf84757-2ab4-42e0-bc36-f5a921bbc580n%40googlegroups.com. -- You received this message because you are subscribed to a topic in the Google Groups "neonixie-l" group. To unsubscribe from this topic, visit https://groups.google.com/d/topic/neonixie-l/gGOmAxDvXIs/unsubscribe. To unsubscribe from this group and all its topics, send an email to neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/CALcVLKJT9%2BBb4d4VyHUZRMNs0CTsj9a-8To8O7W%3Da7UyQ_AKCg%40mail.gmail.com. --- end of original message --- -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/46ef2b08b39464541df010d911469878%40frontapp.com.
