> elec > appareils-de-mesure > measuring-low-voltages-with-old-keithleys-marco-reps

Measuring low voltages with old Keithleys

Marco Reps - 2019-06-09

ESP32 1kg precision load cell kit http://bit.ly/2MzFeZH
10 nV and 1 pA resolution DMM https://www.welectron.com/Keithley-DMM7510-Benchtop-Multimeter
^ help me afford one of these https://www.patreon.com/marcoreps
High Res CNC servos: https://www.motioncontrolproducts.co.uk/products/6/115/pronet-servo-drives-with-motors---encoder-400w/

Marco Reps - 2019-06-09

Thanks again for 100k subs!! Here is a secret path to some old behind-the-scenes-clips: Patreon -> Posts -> Filter by Tier -> Public -> Sort by date -> Oldest first
enjoooy *foodwishes piano tune*

Hi-Smart Alarms - 2019-06-09

Congrats man!

Toxic Can - 2019-06-09

Pin your comment so it shows up at the top! :)

devjock - 2019-06-09

Omg, the onion rings video.. HNGGG.

Hoppity Hooper - 2021-07-11

You're welcome

Markus Dollinger - 2019-06-27

Brilliant - as always ! You might also be interested in the Präcitronic MV40 DC-Milli-Pico-Meter. It's an instrument from the late 60ties made in GDR. It comes with a pA and a 500 Teraohm (!!) measurement range and it's also based on a chopper amplifier. I've repaired and restaurated some MV40, and they're quite fascinating. You can get one for about 30-60 Euro.

SCE to Aux - 2019-06-09

This video was entirely worth it just for the air compressor to blow out solder blobs around 11:10, brilliant! Congrats on 100K!

Chris Wouse - 2019-06-09

I have played a bit with SQUIDS in my last job. Remarkable devices! Ridulous sensitive! After an install of some of our electronics into an old MEG scanner, we gave it a quick test by waving a spanner outside the sheilded room the sensor array was in and it railed the output! Congrats on 100k.

Dr Tune - 2019-06-11

Marco every video is a treat! I love how each shot is clearly given a bit of thought beforehand. You're always funny and I always learn something - Perfect.

Jerrums Wallface - 2019-06-09

It's always a good day when you upload a Video Mr Reps! Thank you for taking the time that you do, to do so.

Ast A. Moore - 2019-06-09

A tip for clearing stubborn vias of solder. Grab a toothpick and dip it into molten rosin or any other type of flux. Then apply heat to the via and stick the toothpick in it. Will clear it right up.

edgeeffect - 2019-11-01

Woah... that 1960s voltage reference is one of the most amazing things I've ever seen.

Today on the Bench - 2019-06-09

With every new video, my own lab feels more and more inadequate....
But interesting content as always!

Marco Reps - 2019-06-09

I use my Brymen dmm for everything and the specialized Keithleys only for tasks related to other specialized instruments of questionable necessity

Das Stackenblochen - 2019-06-09

@Marco Reps I use my multitude of oscillscopes mostly to troubleshoot my multitude of oscilloscopes, too.

Today on the Bench - 2019-06-10

@Marco Reps Yes, it is a self perpetuating hobby per say.

I myself use a multimeter for 90% of everything as well.

Except when an oscilloscope is needed, or a spectrum analyzer.

Varulven - 2019-11-09

@Marco Reps i preferto use saltwater and my tongue. 9v gives a buzz. or a chinese 5$ multimeter.

PERLI - 2019-06-09

For cleaning stuff from pcb holes it helps to add new solder (just so that you have a little bump over it) and then put a lot of flux on it (for me those flux pens works best). Then just use braid normally. Edit: Solder pump from the other side if you have access.

Do It Wrong - 2019-06-09

I'm in love with this content, I have a friend that has no Idea of electronics and loves your videos Marco, that says something, how the f**k can you make it so entertaining, amazing repair! Very entertaining

RSOFT92 - 2019-06-11

I never thought of using my air compressor to help the "de-solder-Process".
Congratulations on 100.000 Subs!

Do It Wrong - 2019-11-29

This channel has it's own section on youtube, no one can compare to this magnificent excellence

andymouse123 - 2019-06-09

I love theses precision vids and with the lower and lower voltage and current specs of readily available "bits of kit" all the more relevant...cheers!

Hiasibua - 2019-06-09

Gratuliere, Marco!
Macht immer wieder Spaß, zuzusehen, zu genießen und, zu sehen, wie du dich über Sachen und Details freuen kannst!

Marco Reps - 2019-06-09

Danke, danke

Tim Thompson - 2019-06-09

Very interesting. I’m just glad my applications don’t get anywhere near that realm. By the way, I’ve seen those same pots with the ball bearings in the Comdyna GP6 analog computer.

John Hill - 2019-06-09

YAGV... Yet Another Great Video, thanks, love your humor. Next time you do some ultra low voltage measurements, be sure to clean all electric al contact surfaces, back in the day I attended a coax cable connector cleaning course, significant difference between before and after cleaning measurements, often enough to bring an out of spec device into spec.

mauro sobreira - 2019-06-09

Marcos well deserved! Congrats and keep the good stuff coming!

Laggger Engineering - 2019-06-09

How is that multi-oscillo-function-generator-meter-scope project going?

I am pretty hyped about it!

goosenp - 2019-06-10

The project is named OSMU, I'm also curious about it

Zack's Lab - 2019-06-12

dude... the air compressor desoldering trick for through hole was awesome, thanks for sharing that!

devjock - 2019-06-09

Duuuuude, your metrology department is uhh, up to snuff. Holy shit you're flexing that German precision on us :D

And rightfully so btw! Congrats on 100K!

Lohi Karhu - 2021-03-01

That funny reduction geared pot also appears in early Tektronix scopes...and, stacked with another standard pot, for the horizontal position control...
Proper press-fit connections are used in automotive applications because they are so very reliable..."proper" ;-)

aksting - 2019-06-09

Are you planning on making your own version of a Theremin instrument with those microvolts and nanovolts?

Joe Hays - 2019-06-10

I have no idea what any of that stuff is, but I just love the way you show it off I can't help but keep watching your videos. Keep up the good, and entertaining work

M. Otto - 2019-06-10

Comedic gold, with a generous dash of Elektrotechnik. Always nice

Scot Harkins - 2020-07-31

I could swear you said "fecovolt". That needs to be a unit of measure! Not sure what ASCII char would represent "feco", but could imagine a unicode option.

NNNI - 2019-06-09

Congrats Marco!
Your content is such good quality and you inspired me to narrate my videos too, thanks a lot! :3

Marco Reps - 2019-06-09

Thank you! Your rail gun looks interesting, sadly it is illegal to try that here

NNNI - 2019-06-09

@Marco Reps I'm trying not to faint hehe
However on a more serious note, if you have some ideas I could try them for you.

hernanc - 2020-03-12

Hey Marco love your videos, thank you! Which compressor did you buy? Care to share your selection criteria in one of your videos? Thanks for the great content!

Zorktx Andnand - 2019-06-10

there are these rare days when you click a youtube recommendation and it ticks all the boxes!
I like it all. The content, and specially you don't dumb stuff down, had some nice trick's in there (gonna use the compressed air solder trick for sure). And an Austrian with a good sens of humor! (are you even allowed to have so much more humor then Germans?)


You pack a lot of knowledge in a video so there is something to learn for (I guess) everyone.
Today is a good day.

Andres Lopez Pulzovan - 2019-06-09

I never avoided my responsibilities so fast

srjskam - 2019-06-09

If you have any untrustworthy steel bars, better store them behind trustworthy steel bars. They're up to no good.

douro20 - 2019-06-11

My Heathkit IT-18 transistor checker has that type of multiturn variable resistor inside of it. The thing is extraordinarily sensitive.

Hannibal Feather - 2019-06-09

Those PCB press fit connectors can be made extremely reliable. EEVBlog 517 was an airbag controller teardown and it used those press fit things. If it's reliable enough for an airbag, they're probably reliable enough for a front panel.

Marco Reps - 2019-06-09

Oh yes I vaguely remember that ... but I still don't like it

Marcel Huguenin - 2019-06-11

Congrats with 100k. It's always a pleasure to watch your videos.

CoolMusicToMyEars - 2022-05-19

I love those Keithley 181 nV Digital Meters, Custom Plug for that 40 years ago was around £200, True copper pins

CoolMusicToMyEars - 2022-02-13

The Keithley 2 Pin pure copper connector many years ago Just for the connector was around £200, I used crimped Gold Plated Copper on Silver plated copper PTFE Twisted pair with Silver Screen outer Tufnell Outer wrapped, NO SOLDER used in the UKAS Test Laboratory on Low voltage cable for any DC measurements,

Asger Vestbjerg - 2019-06-09

Impressive hunt for errors
Thanks for sharing :-)

CoolMusicToMyEars - 2022-05-19

keithley 155 so stable so well built :)

Tom Steemson - 2022-09-12

That potentiometer is nothing short of a piece of artwork.

Hi-Smart Alarms - 2019-06-09

Hey Marco love the videos keep them up!

Marco Reps - 2019-06-09

Thanks, I will!

Daniel Console - 2019-06-10

if anyone deserves more attention on YouTube, it's you. Congrats!

THEBIGMEOW - 2019-06-10

Congratulations 🎊
Keep up the great work ♥

1959Berre - 2019-06-17

Congrats on the subscriptions. I guess a lot of them are not in electronics; they probably like the way you make boring stuff funny. Besides, the wonderful accent is the cherry on the cake. Keep on the good job.

Alan Alvarez - 2019-06-10

Congratulations on 100k keep it up man!

Amon Todd - 2019-06-10

10/10 Commentary! Most of the time I can't pay attention to the educational side of the video because I'm laughing so much. Well done :)

CoolMusicToMyEars - 2022-05-19

Those Solartron 1081 DMMs are nice, we had one for a UKAS Audit in the UKAS Laboratory

ed - 2019-06-09

If you've never seen the potentiometer with the bearings, you've lead a sheltered life. Welcome to the world of older stuff.

Patrick Dorion - 2019-06-10

I love you 😊

I'm sure you could make your videos hours-long and nobody would complain... even livestream your entire life...

Some guy on the internet - 2019-06-09

wow such huge lossess/differences in just materials... Never knew solder joints are so... disjointed.

JonathanH13 - 2019-06-13

Simply brilliant!