Open Source 8.5 Digit Voltmeter from CERN: Build and Test

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00:00 Intro
02:25 Circuit Overview
05:18 Assembly
10:19 Soldering
13:51 THT parts
15:47 Mechanical stuff
25:10 Software
31:02 Result

[sethphillips]

I didn't understand 80% of what happened in this video but it was one of the most satisfying things i've ever watched.

[lmamakos]

I have not seen DIY vapor phase reflow soldering before! The potential lethal danger adds that special level of excitement!

[xDevscom_EE]

Need moar ppms! Nice work and thumbs up for CERN folks for pushing DIY metrology forwards!

[Cervra]

Oh Mr Reps I have missed you so much <3

[xdenmmx]

I understand so little of what you are talking about but can totally appreciate taking on a project of this size! Very well done!

[BrainGuy]

I feel like a phone sex operator just spoke to me in pretend English for 35 min. I enjoyed every second.

[Slide]

You got an LOL out of me with the line: “It can’t be that hard, can it?”

Beautiful piece of equipment. Throughly enjoyed the build.

[K.D.Fischer_HEPHY]

Glad you can profit from the open sourced equipment designed for fundamental research. Thats one reason why research is important, in my opinion. You went full out with all the components. No cheap session at all. Very nicely done Mr. Reps.

[VincentOlivier]

I, gentleman, hereby manifest my interest in some Marco Reps bath water.

[killertoast]

What a funny, informative and interesting video! Your level of skill and diverse talent is just so inspiring! Really love your channel, please keep up the awesome work

[gymprofessor]

This is absolutely hands down the most impressive video you have ever made! Wow! Mr carson's lab quality process and signal path level circuitry. Amazing. I'm glued to my phone haha

[RobertGracie]

When Mr Reps said "straight FROM THE ARCANERY" was the most memorable bit for me :D but his voice is pure ASMR!

[axel]

"Few hundred thousand dollar assembly line"

*Looks nervously at the two students tasked at soldering 200 boards by hand*

[firstmkb]

The dry delivery had me smiling, but the ring had me laughing out loud! This was phenomenal work for someone working at home, and at a level of quality I'll never see.

[TMS]

I love LEMO connectors. Incredibly expensive, but widely used in medical instruments for very good reason. The quality is unmatched, and you can get ridiculously small connectors with amazing voltage and current specs.

[ddavity]

- Ok, time for bed
* Another video of Marco Reps pops in YouTube *
- You know? Still some minutes for another video

[leonardmilcin]

I am an amateur but one thing I designed for myself was rather ridiculously overengineered controller for espresso machine. This isn't simple PID but rather it uses thermal model of the entire device, moving horizon estimator to run that model 50 times a second and kalman filters to continuously correct model parameter changes over long periods of time. It is precise enough to give accurate estimate of the amount of scale in the boiler!
One challenge was building an ultra low noise and high precision thermometer in a harsh environment (moisture and huge temperature gradient). The thermometer had to resolve 1/1000th of a degree to get fast and accurate measurement of temperature change rate.
In the end I figure out that the biggest problem wasn't even the temperature difference (could be accounted in software) but rather temperature gradients. I split the design to a power board which contained power supply and triacs to turn on/off heater, valves and pumps from the sensitive measurement board and I built 4 layer enclosure to envelope the sensitive board with a shield that alternates layers of copper and thermal insulator (from inside: copper, foam, copper, foam). I then had a temp probe mounted on board and used it to compensate results.
In this case the actual absolute results don't matter much (it does not make a difference whether water used to brew coffee is 0.1 degrees hotter or colder) but rather I needed fast and continuous measurement of rate of change so that I could predict to less than 0, 5s when to reduce the heat from full power and to what level so that predicted brewing temperature is achieved as quickly as is possible and then kept stable without any over or undershoots.

[Hilde_von_Derp]

That feeling when you take 30 minutes of your day to bask in the raw magnificence of a beautiful machine coming together. Wonderful work Marco and nothing but love to CERN for open sourcing this. Magnificent work by everyone. Thank you for sharing.

[PhG]

'Not always so serious video'.... it's that kind of German sense of humor that keeps us going ! Much appreciated. Excellent video all together !

[benjamincolumbus]

Enjoy your PPMs Marco, CERN has blessed us