[neonixie-l] tubecrafter.com now on the air
> > Just a subject change... -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To view this discussion on the web, visit https://groups.google.com/d/msg/neonixie-l/-/YJWn3yXMcVMJ. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
[neonixie-l] Subject lines in posts...
Another gentle reminder. Please, when replying to a thread do NOT change the subject - leave it as it was. When starting a new thread, make sure the subject is something reasonable - this is especially prone to problems if you "reply" to an email digest message instead of explicitly starting a new thread - if you want to start a new thread, do so by either using the web interface at https://groups.google.com/forum/?fromgroups#!forum/neonixie-l or by sending a mail to neonixie-l@googlegroups.com with the new subject - do NOT reply to an email message from neonixie-l with just a new subject - there are threading markers in the header of the incoming message that will cause your "new" thread to just be appended to the thread you replied to. Many thanks Nick -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To view this discussion on the web, visit https://groups.google.com/d/msg/neonixie-l/-/xEDrj-bHyDkJ. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
[neonixie-l] Re: Nixie multimeter
That sounds awesome! I just wonder why your summing register would overflow after 500 samples. If you have a 10 bit A/D converter, summing 500 squared samples would only require 29 bits. That is a very odd number, so there must be something wrong here. Is the 10 bit value a signed value or unsigned? You should define z as a double (32 bit) and also your summing register as a double. Then you should have enough bits for 4096 samples. Anyway even with just 500 samples, it is clear that the measurement is far superior to your DMM measurement (which was to be expected). Michel On Jun 10, 5:57 am, Tobias wrote: > Gentlemen > > After a very long week I am happy to say that the last three hours > playing with my Nixie Multi Meter were very rewarding! > We finished the code. > > The long sum was overflowing after 500 or so measurements, so I had to > divide it by 10 before squaring it. The final result shown on the > serial monitor is in centivolts, if that makes any sense. > > I did only two experiments so far: using a 1,5V cell showed.. 1,52V! > and my DMM showed 1,523V. Not bad. > And the one Martin proposed. Awesome results. A little transformer > being half-wave rectified. > > I took a oscilloscope shot of it that includes a RMS reading of 5,38 > V:http://tobiasmugge.files.wordpress.com/2012/06/rms_waveform.png > > Then my NMM, doing 512 samples in ~254 ms: 5,35 V, with a 0,05 V > variation > measurements.http://tobiasmugge.files.wordpress.com/2012/06/rms_reading_512.png > > And @ 1024 samples in ~374 ms: 5,34 V with 0,03V variation between > measurements.http://tobiasmugge.files.wordpress.com/2012/06/rms_reading_1024.png > > My RMS(!) DMM was reading 3,635 V! +_+ > > I will write a piece of code that changes between the averaging > function David talked about and the 10bits no-averaging mode AD for > the RMS measurement. > > Now I think I need to build a precision rectifier for the input, so I > can read AC voltages. > > Thanks everybody! > > Tobias > > On Jun 6, 1:53 am, Dekatron42 wrote: > > > > > > > > > Don't forget to measure half-wave rectified signals to see what > > results you get (square, sine and triangular) as that is something > > that many RMS meters fail on. > > > /Martin > > > On 6 Juni, 00:04, Cobra007 wrote: > > > > That is a fabulous result! > > > > I think I would do the same thing, take the 1000 readings non- > > > interrupt based. See how accurate it is, otherwise take 2000 samples, > > > or 3000 which will only take 0.5 seconds. > > > > Let us know the result, measure sine waves, triangular waves and > > > square waves. > > > > Michel > > > > On Jun 5, 11:42 pm, Tobias wrote: > > > > > David: I am using the INA219 averaging at 128 samples. It is a very > > > > good feature indeed. We are trying to get a library together with all > > > > the functions so we can switch back and forth between some of the > > > > features depending on what is being read from it. > > > > > Michel: Tests are done! I found a faster way to do the i2c. And your > > > > math worked great reducing processing time! > > > > I tried to run the encoder function once in a while but it did not > > > > work. Lets say was a mistake not to put a interruption pin on my IO > > > > header. > > > > > Just i2c get bus voltage: 193 ms > > > > Using sq() function: 388 ms > > > > Using z*=z then summing: 196 ms > > > > Including encoder z*=z: 207 ms > > > > > At 207 ms for a thousand readings we have 4.8 kHz, or 80 points for a > > > > 60Hz sine. =) > > > > I think I will finish up the code and try to take some measurements. > > > > > You say doing time interrupt is going to slow this down. What about > > > > counting all the 1000 readings and dividing by the time it took to > > > > make them? Not a good idea? > > > > > Tobias > > > > > On 5 jun, 04:14, Cobra007 wrote: > > > > > > > The way to do this properly, as in how a real DMM does it, is to > > > > > > use a > > > > > > dual-slope converter that will produce a useful number with every > > > > > > sample. > > > > > > > These successive approximation converters that are common as dirt > > > > > > these > > > > > > days are just not very good at the job of converting a signal and > > > > > > producing a useful number. > > > > > > > -- > > > > > > David Forbes, Tucson AZ > > > > > > DMMs with true RMS measurements have been discussed here before, but > > > > > the only proper way to measure true RMS is by following it's > > > > > definition. > > > > > > My DMM is also true RMS, but really, any DC voltage shows as 0V RMS > > > > > which is by definition incorrect. Leaving out the DC component means > > > > > including a high pass filter, but they are not ideal, so for any > > > > > frequency below the specified frequencies, you cannot rely on the RMS > > > > > reading. Following this integral and squaring method should produce a > > > > > reliable reading from 0Hz up to a certain frequency. > > > > > > Michel -- You received this message beca
Re: [neonixie-l] Re: QS18C-1
Hi! Thanks but: No, we made these pictures just to compare the size between the NL-8091 and the QS30-1. But I was asking for the QS18C-1. I now got the pictures already from the DIY Nixie Forum. Dieter - Original Message - From: MichaelB To: neonixie-l@googlegroups.com Sent: Saturday, June 09, 2012 10:03 PM Subject: [neonixie-l] Re: QS18C-1 Sorry, here is is http://www.guokr.com/blog/68263/ On Saturday, June 9, 2012 12:16:51 PM UTC-7, kay486 wrote: The image doesent work for me. On Saturday, June 9, 2012 8:01:17 PM UTC+1, MichaelB wrote: This is it next to he 8091, right? On Saturday, June 9, 2012 12:56:32 AM UTC-7, Nocrotec wrote: Hi Nixie Friends, I'm looking for a picture of the QS18C-1 Nixie tubes. These were made by 辉光 or 新光 (Hui Guang or Xinguang) Can anyone help? Thanks Dieter -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To view this discussion on the web, visit https://groups.google.com/d/msg/neonixie-l/-/Hrgl88POiEUJ. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
[neonixie-l] Re: QS18C-1
Sorry, here is is http://www.guokr.com/blog/68263/ On Saturday, June 9, 2012 12:16:51 PM UTC-7, kay486 wrote: > > The image doesent work for me. > > On Saturday, June 9, 2012 8:01:17 PM UTC+1, MichaelB wrote: >> >> This is it next to he 8091, right? >> >> [image: z8wl0h.jpeg] >> >> On Saturday, June 9, 2012 12:56:32 AM UTC-7, Nocrotec wrote: >>> >>> Hi Nixie Friends, >>> I'm looking for a picture of the QS18C-1 Nixie tubes. >>> These were made by 辉光 or 新光 (Hui Guang or Xinguang) >>> Can anyone help? >>> Thanks >>> Dieter >>> >>> -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To view this discussion on the web, visit https://groups.google.com/d/msg/neonixie-l/-/Hrgl88POiEUJ. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
[neonixie-l] Re: Nixie multimeter
Gentlemen After a very long week I am happy to say that the last three hours playing with my Nixie Multi Meter were very rewarding! We finished the code. The long sum was overflowing after 500 or so measurements, so I had to divide it by 10 before squaring it. The final result shown on the serial monitor is in centivolts, if that makes any sense. I did only two experiments so far: using a 1,5V cell showed.. 1,52V! and my DMM showed 1,523V. Not bad. And the one Martin proposed. Awesome results. A little transformer being half-wave rectified. I took a oscilloscope shot of it that includes a RMS reading of 5,38 V: http://tobiasmugge.files.wordpress.com/2012/06/rms_waveform.png Then my NMM, doing 512 samples in ~254 ms: 5,35 V, with a 0,05 V variation measurements. http://tobiasmugge.files.wordpress.com/2012/06/rms_reading_512.png And @ 1024 samples in ~374 ms: 5,34 V with 0,03V variation between measurements. http://tobiasmugge.files.wordpress.com/2012/06/rms_reading_1024.png My RMS(!) DMM was reading 3,635 V! +_+ I will write a piece of code that changes between the averaging function David talked about and the 10bits no-averaging mode AD for the RMS measurement. Now I think I need to build a precision rectifier for the input, so I can read AC voltages. Thanks everybody! Tobias On Jun 6, 1:53 am, Dekatron42 wrote: > Don't forget to measure half-wave rectified signals to see what > results you get (square, sine and triangular) as that is something > that many RMS meters fail on. > > /Martin > > On 6 Juni, 00:04, Cobra007 wrote: > > > > > > > > > That is a fabulous result! > > > I think I would do the same thing, take the 1000 readings non- > > interrupt based. See how accurate it is, otherwise take 2000 samples, > > or 3000 which will only take 0.5 seconds. > > > Let us know the result, measure sine waves, triangular waves and > > square waves. > > > Michel > > > On Jun 5, 11:42 pm, Tobias wrote: > > > > David: I am using the INA219 averaging at 128 samples. It is a very > > > good feature indeed. We are trying to get a library together with all > > > the functions so we can switch back and forth between some of the > > > features depending on what is being read from it. > > > > Michel: Tests are done! I found a faster way to do the i2c. And your > > > math worked great reducing processing time! > > > I tried to run the encoder function once in a while but it did not > > > work. Lets say was a mistake not to put a interruption pin on my IO > > > header. > > > > Just i2c get bus voltage: 193 ms > > > Using sq() function: 388 ms > > > Using z*=z then summing: 196 ms > > > Including encoder z*=z: 207 ms > > > > At 207 ms for a thousand readings we have 4.8 kHz, or 80 points for a > > > 60Hz sine. =) > > > I think I will finish up the code and try to take some measurements. > > > > You say doing time interrupt is going to slow this down. What about > > > counting all the 1000 readings and dividing by the time it took to > > > make them? Not a good idea? > > > > Tobias > > > > On 5 jun, 04:14, Cobra007 wrote: > > > > > > The way to do this properly, as in how a real DMM does it, is to use a > > > > > dual-slope converter that will produce a useful number with every > > > > > sample. > > > > > > These successive approximation converters that are common as dirt > > > > > these > > > > > days are just not very good at the job of converting a signal and > > > > > producing a useful number. > > > > > > -- > > > > > David Forbes, Tucson AZ > > > > > DMMs with true RMS measurements have been discussed here before, but > > > > the only proper way to measure true RMS is by following it's > > > > definition. > > > > > My DMM is also true RMS, but really, any DC voltage shows as 0V RMS > > > > which is by definition incorrect. Leaving out the DC component means > > > > including a high pass filter, but they are not ideal, so for any > > > > frequency below the specified frequencies, you cannot rely on the RMS > > > > reading. Following this integral and squaring method should produce a > > > > reliable reading from 0Hz up to a certain frequency. > > > > > Michel -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
[neonixie-l] Re: QS18C-1
The image doesent work for me. On Saturday, June 9, 2012 8:01:17 PM UTC+1, MichaelB wrote: > > This is it next to he 8091, right? > > [image: z8wl0h.jpeg] > > On Saturday, June 9, 2012 12:56:32 AM UTC-7, Nocrotec wrote: >> >> Hi Nixie Friends, >> I'm looking for a picture of the QS18C-1 Nixie tubes. >> These were made by 辉光 or 新光 (Hui Guang or Xinguang) >> Can anyone help? >> Thanks >> Dieter >> >> -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To view this discussion on the web, visit https://groups.google.com/d/msg/neonixie-l/-/NtspWmdhN3YJ. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
[neonixie-l] Re: QS18C-1
This is it next to he 8091, right? [image: z8wl0h.jpeg] On Saturday, June 9, 2012 12:56:32 AM UTC-7, Nocrotec wrote: > > Hi Nixie Friends, > I'm looking for a picture of the QS18C-1 Nixie tubes. > These were made by 辉光 or 新光 (Hui Guang or Xinguang) > Can anyone help? > Thanks > Dieter > > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To view this discussion on the web, visit https://groups.google.com/d/msg/neonixie-l/-/D8S_idHcf30J. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
[neonixie-l] QS18C-1
Hi Nixie Friends, I'm looking for a picture of the QS18C-1 Nixie tubes. These were made by 辉光 or 新光 (Hui Guang or Xinguang) Can anyone help? Thanks Dieter -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
