Hi Tobias and welcome... Nice project - glad the cathode poisoning issue has been resolved - its looking good.
Keep the thread updated with how you progress on the ESR and LCR front! Cheers Nick On Thursday, 31 May 2012 16:58:15 UTC+1, Tobias wrote: > > Hello, I am new to this group and I would like to introduce myself > with a project that I have been working on. > > This is my attempt to create a DMM using IN-12s, a IN-15A and a IN-15B > as display. I used my nixie clock board as base, so it can double as a > clock when not used as multimeter =) > > http://tobiasmugge.files.wordpress.com/2012/05/dscn4039.jpg > http://tobiasmugge.files.wordpress.com/2012/05/dscn4034.jpg > > The uC is a Atmel Atmega328p. I downloaded arduino bootloader on it. > I am using supertex HV5522 as drivers for the nixies. Two of them for > 64bits. A friend of mine wrote a library for it that includes > brightness control via the HV5522 blank pin. He is currently > programming the clock while I work on the DMM. > > Power consumption is around 3W. DC power supply from 9 to 12V. The > voltage for the tubes is boosted from the input voltage using a switch- > mode power supply based on the TubeHobby one. > > The pictures and video shows voltage reading: is the only measurement > I implemented on the software so far. Still thinking how to approach > the scales/units. > > I have a shunt resistor on the board and I plan on having voltage, > current, power, frequency and duty cycle for DC. I am using a I2C A/D > with a PGA, measuring voltage on both sides of the shunt. This was a > fairly cheap solution, but the way I did it only works for DC and the > range is 0 to 32V. But allows me to measure current and voltage at the > same time =) > > I have a video of the thing working: > http://www.youtube.com/watch?v=PNYnFTeADow > The maximum error I measured was 1,2% when comparing to my not-that- > bad-multimeter. > > I plan on implementing resistance, capacitance, inductance and AC > voltage/current capabilities. Suggestions will be greatly appreciated! > > The IN-15A showed on the pictures is not fully lightened. I am > following Nick suggestion to burn it at 6mA for one hour. So far so > good. > > I am still trying to find some IN-12B as those include the dot. I do > have 4 bits free on the HV5522 that I could use to drive IN-12B dots > or INS-1. -- 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/-/1QNCnILCjzAJ. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
