Ultra Precise Multimeter* Datron 4950 Repair** & Analysis

Рет қаралды 65,149

Күн бұрын

PCBWays precise prototyping service pcbway.com/g/Tj5om7
Benchtop DMMs at Welectron www.welectron.com/Benchtop_1
More from me sometimes / marcoreps
4950 with delidded resistor networks www.eevblog.com/forum/metrolo...
Inside axial Vishay foil resistors www.eevblog.com/forum/metrolo...
Voltage reference module schematic xdevs.com/doc/Wavetek/4920M/p...
00:00 Intro
03:37 Teardown
05:08 Digital board
07:24 Current board
09:55 Ohms board
16:05 Front assembly
17:24 AC assembly
24:59 DC main board
32:08 Result :\
#metrology #repair #engineering

Пікірлер: 130

@reps Жыл бұрын

Happy #worldmetrologyday

@walterwhite2291 Жыл бұрын

Holy cow 3 videos in a week, must be Christmas or something. 👍

@IanScottJohnston Жыл бұрын

20th May......yes, I plan on staying in the workshop tonight with my 3458A and raising a glass with her. We will be sharing a very, very small bag of PPM's.

@MrEdwinHubble Жыл бұрын

Time to look into the Präcitronic DC MV40-Milli-Pico meter again...

@Edisson. Жыл бұрын

@@IanScottJohnston Hmmm, I'll go to the workshop too and look at the bottom of the vodka bottle so that when I look at my Rigol I forget that there is any PPM 🤪

@xDevscom_EE Жыл бұрын

You can also disable limit on ranges and use it like "normal" 1271 with degraded specs. 4950 uses better resistors than 1281 in ohm assemblies.

@reps Жыл бұрын

Wow! BAND LMT: OFF how did I not try that before 😮That is great!

@namAehT Жыл бұрын

Oh boy, I know exactly what I'm going to be doing for the next 32 minutes. Hint: Not work.

@JurassicJenkins Жыл бұрын

I’m grabbing a beer 😂

@austo2010 Жыл бұрын

This counts as CPD hours I think

@zyeborm Жыл бұрын

If your work is event tangentially related then I think this counts

@MeriaDuck Жыл бұрын

That grey PCB looks like pure obtanium with parts worth their weight in some precious metal 😍

@MeriaDuck Жыл бұрын

I meant unobtanium of course

@jb3757 11 ай бұрын

The sarcasm is a metrology grade, hermetically sealed no laughter masterpiece. Precious.

@JagerEinheit Жыл бұрын

So Marco if I ever get around to writing my movie script about disappearing PPM's would you want to be the evil villain, hording the ppm's? or the hyper intelligent good guy german who is measuring the missing ppm's to track down the villain? the twist is both are the same person, but one measures ppms... and one "loses"/ "adjusts" the calibration data and steals them for his ppm vault.

@reedreamer9518 Жыл бұрын

Blahhahahahah!

@marcus_w0 Жыл бұрын

The fact, that he as a German, speaks like a scotch and using terms like "yoink" for specialized tasks, is the reason I'm subscribed right from the start. Thumbs up.

@projectartichoke Жыл бұрын

Those tin whiskers are concerning, I wonder if disturbing them could be the cause of the failure. They can blow around quite easily and can really travel. Best to dampen a small artist's brush with de-ionized water and use that to remove them. They will cling to a damp brush which you can wipe often with a damp cloth to prevent redistributing them.

@cambridgemart2075 Жыл бұрын

Unless this is is fairly modern, i.e RoHS compliant, I'm surprised to see tin whiskers.

@MoritzvonSchweinitz Жыл бұрын

"I enjoy making my videos less than half an hour long"...exactly at 30:00 ! 😀

@Oscar_Kerkenaar Жыл бұрын

I don't understand much about electronics (yes, monkeys can learn). But I like the humor in your video's. Keep up the good work! :)

@bansci Жыл бұрын

Beautiful Datron engineering again, thanks for the tour!

@ericlotze7724 Жыл бұрын

16:36 …and I thought it was a mere LCD, but it is a gorgeous VFD !

@akkudakkupl Жыл бұрын

That reference module has some 1930's Germany vibes :D

@swebigmac100 Жыл бұрын

28:04 straight to the comments 😆😆😆

@tannerbass7146 Жыл бұрын

My Datron 1082 is easily my favorite tool to use 😊 They really made some slick equipment back in the day!

@ziginox Жыл бұрын

Absolutely gorgeous with the panaplex displays, too! It's a shame the test gear market shrank so much in the 90's and early 2000s.

@Megabobster Жыл бұрын

inter board communication makes me hope it's something super simple like needing to reseat the interconnects. looking forward to seeing this guy in action!

@siegmundeurades5753 Жыл бұрын

I for one am extremely happy with the release schedule as of late.

@kayaker2k Жыл бұрын

Wow that fast pass reference threw me back 20 years! Nice video as always!

@AmiPurple Жыл бұрын

These videos are never too dense! All this talk about ppms sounds like lovely music

@Edisson. Жыл бұрын

Oh no, perfect reverse engineering has turned into less perfect reverse service - from a little functional to non-functional 😥 I'm always horrified by this, when I put completely new ones among evenly aged parts, the circuit starts to work differently. You can handle it and recalibrate, I fully trust you 👍 such a super machine must work. Nice day 🙂 Tom

@laserdan Жыл бұрын

If it ain't broke, fix it till it is!

@Edisson. Жыл бұрын

@@laserdan Although they say "It works, don't touch it" but that is not the case in this case, parts that would cause major damage if they fail have to be replaced after a while. When working on such large old PCBs, I am always concerned about their bending, when thin paths may crack, or when vacuuming, I am concerned about damage to the through-holes on multi-layer boards - it becomes brittle with age.

@Sharkie1717 Жыл бұрын

So funny! I love seeing all this metrology stuff. Can't wait for the next video.

@antoineroquentin2297 Жыл бұрын

Die Videos sind mit so viel Liebe gemacht.

@irritantno9 Жыл бұрын

Finally a reps video that’s representative of all of my repair attempts. Ich liebe dich!

@jamesmauer7398 Жыл бұрын

Cool multimeter! I didn't know such devices existed with the very limited measurement ranges. Looking forward to the next video!

@JohnUsp Жыл бұрын

As always, an Awesome Video. Thank you Marco.

@ricolorenz7307 5 ай бұрын

I have no idea what you're talking about 80.0008521% of the time, and none of your content has any relevance to me, but your videos are so well made I love watching them. It really shows it doesn't matter what you're doing, if you can make entertaining videos, people will watch them. This could be one of the most boring channels on KZfaq, but instead it's one of the best. Also, the millisecond advantage joke was very funny Edit: 27:43 CLOSE YOUR EYES CHILDREN

@hermannschaefer4777 Жыл бұрын

Repaired 2 Datron 1041 from the 80s in the recent years and they still impress me with their accuracy (~0.01% +1dig DC). Had to replace almost all caps, but main problem were dead LS74-chip, almost all of them were broken. Seems they age quite fast...

@lambda7652 Жыл бұрын

Waht is all this Multimeter talk on the Power station and vacuum cleaner channel

@PCBWay Жыл бұрын

Fabulous as alwaysssss👍👍👍👍👍

@chicoroth8679 Жыл бұрын

very, very impressive. thank you.

@tnts999998 Жыл бұрын

You are on fire since some days! Please continue :)

@floodo1 Жыл бұрын

My mom says “pray tell”, surprised to hear it from non-American (-8. What a beauty that device is

@Txepetxcc Жыл бұрын

Power electronics engineer here. I've been in 3 labs already and i tell you in my field nobody knows how to design proper sensor conditioning stages. Thanks to you i hear terms like zero drift and autozero and chopping

@ericlotze7724 Жыл бұрын

14:41 I’d love to have the recipe ! Even if in the next video, it will make a wonderful drink for celebrating World Metrology Day!

@MeriaDuck Жыл бұрын

I read ' calibrating World Metrology Day' 🤣

@supercompooper Жыл бұрын

Your voice is so soothing. On every level. 😊

@PCBWay Жыл бұрын

Fully aggree

@vincei4252 Жыл бұрын

Marco, I can hear your solar power inverters whirring in the background. Seems to be a new permanent addition to the channel :)

@ericlotze7724 Жыл бұрын

Granted schedule is probably plenty full, but a mod (or better yet an Open Source Custom One!) would be a great video.

@pomonabill220 Жыл бұрын

You always get the neat toys!!!!

@lohikarhu734 Жыл бұрын

how do you like the MXO4? I was a München AE for the scope group for 3+ years, and made many, many suggestions for changes and fixes to the 'previous generations'... I'd be very interested to spend some time on the MXO4, to see how many of my suggestions made their way into that machine...from the nice screen shot at 24:34, it looks like several (many?) of my inputs finally made their way to your bench!!

@reps Жыл бұрын

Love it. The most recent firmware upgrade wiped out every last one of the few small complaints I had. Longer MXO4 vid coming ...

@derkarhu5079 Жыл бұрын

Cool... good to hear! Both comments 🇨🇦🐻‍❄️🇩🇪

@derkarhu5079 Жыл бұрын

Btw, I have a couple of "general radio" 0,005% resistors that would be interesting to check out, 100k and 1,000M...

@floodo1 Жыл бұрын

this guy with the gamer humor and using MS Paint

@goober-ll1wx Жыл бұрын

I wish I were as smart as you, fascinating as usual!

@Angel_the_Bunny Жыл бұрын

Something about your videos is like crack for my senses. So good.

@VaZZoN Жыл бұрын

3rd video in 4-5 days ❤

@Momchil0 Жыл бұрын

Long video = good 30-90min is perfectly fine

@lostlullo Жыл бұрын

Nice graphic portal reference :)

@andymouse Жыл бұрын

Awesome !....cheers.

@l3VGV Жыл бұрын

Yes, please!

@arthurdent8091 Жыл бұрын

Impressive. I only wish I knew how, where, and why to use such a complex piece of tech.

@nickcaruso Жыл бұрын

precision adventure time!

@MoritzvonSchweinitz Жыл бұрын

No mention of the...unfortunate...form of the cutouts on the reference at 28:00 ?

@dawa11122 Жыл бұрын

he "commented" that on the ADR1000 video at 5:00 :P

@Condurafly Жыл бұрын

Looking forward to the video based on the research of my alma matar

@PlaywithJunk Жыл бұрын

I like your EPROM eraser...

@gbclab Жыл бұрын

Wow😊

@alexscarbro796 Жыл бұрын

Could the PTFE based PCB instead be chosen for low moisture absorption?

@douro20 Жыл бұрын

The 1281 makes a 3458A look very simple in comparison.

Жыл бұрын

Electrically illiterate me learned what is hermetically-sealed resistors are today. Thanks.

@rahulkushwaha9500 Жыл бұрын

can you make a tutorial on how to properly use the falstad circuit simulator. I guess you are the only one I have seen using that sim on youtube or anywhere else.

@milk-it Жыл бұрын

30 minutes does a justice to such devices. Lots of things learned and discovered!

@geemcd Жыл бұрын

❤ for Lemongrab x

@rushoffman965 Жыл бұрын

What is the purpose of the ceramic beads on leads? I noticed some are on each leg of a component, while others are on "jumper" wires.

@rorywilliams5131 9 ай бұрын

On the Zeners it is to space the hot component off the board. The test point would not be usable if it was pulled tight to the board by the cut and clench machine.

@legobuildingsrewiew7538 Жыл бұрын

FINALLYHHHH

@TheRemo176 Жыл бұрын

Fantastic video ! At 25:35, is that outerwilds I hear playing in the background by any chance ?

@reps Жыл бұрын

I think that might be @HeleneVogelsinger shining through

@Dragonmastur24 Жыл бұрын

and silver does whiskers too!

@OmarMekkawy Жыл бұрын

Oh no, here we have our entertainment for 32 minutes :D

@t1d100 Жыл бұрын

I have no knowledge regarding tin whiskers, other than knowing that they can occur... So, this suggestion might not be a good solution... But, let's give it some consideration... How about applying tinning solution to the accessible portions of the effected component? Might that bond to the metallic surface and serve as a sealant, without trapping heat?

@steubens7 Жыл бұрын

dungeon. one million years dungeon

@sarahjrandomnumbers Жыл бұрын

29:00 Let it be known throughout the land that this was the moment when I stopped saying the word "tantalum" again, and instead, said "Tantrum".

@reedreamer9518 Жыл бұрын

Romancing the PPM's - its a nice hobby if you can afford it.

@abacabdk3490 Жыл бұрын

If it's not broken, fix it until it is!

@roboman2444 Жыл бұрын

Isolated solder iron = torch + piece of metal. Don't you have a ts100 and a battery that could've been used?

@mikelemon5109 Жыл бұрын

27:30 *Trumpets start playing* " Auf der heide blut ain kleiness bluemelein... Und das heist: Erika"

@volkerracho5954 Жыл бұрын

"WOLLT IHR DEN TOTALEN PPM?!"

@FryChicken Жыл бұрын

Make a Multimeter Tier List

@tobimai4843 Жыл бұрын

The cutouts on the LTZ board look sus

@nrcha Жыл бұрын

Now that you have explained it, I can …

@cambridgemart2075 Жыл бұрын

Heatshrink Solder Sleeves are approved for military and aerospace use, so don't dismiss them so quickly!

@VEC7ORlt Жыл бұрын

I'll be calling voltage measurement competitive voltnutting from this point on. TL431 has been sacrificed on the altar of PPMs.

@shazam6274 Жыл бұрын

New phrase / song for you: "Every Electron is Sacred" to the music from: Monty Python's "The Meaning of Life"

@Zadster Жыл бұрын

[Heavy Breathing Intensifies meme]

@molitovv Жыл бұрын

I always watch you videos and love them but I must admit, I have no idea why someone would need such accurate standards or measurement. What are these things for?

@chefchaudard3580 Жыл бұрын

Calibration rooms, basically. Where multimeters and other measurement equipments are calibrated. It makes checking and setting up the test bench easier, as references are directly displayed in Ohms, Volts, Amps, rather than reading and doing calculations on resistor boxes, battery or whatever standard references are used. This also can be automated by connecting the multimeter to a computer.

@molitovv Жыл бұрын

@@chefchaudard3580 Thank you

@AndersEinarHilden Жыл бұрын

I had to think thrice when you said 18 years (recorded in 2018?) but then I remembered the 5 years. 2000+5+18=2023.

@Olli120 Жыл бұрын

28:02 The circuit board of tolerance, right there. 🙈

@reps Жыл бұрын

that is great play of words, I might have to steal that if there's another opportunity

@appercumstock3017 Жыл бұрын

Pffff Reps...: the multitude of goodies you have collected!! Just for the e-porn i need to watch it again.

@x1000plusx Жыл бұрын

20:54 the laughing desoldering tool is not real, it cant hurt you

@ThePlacehole Жыл бұрын

Was 20:57 a Feel Good Inc. reference?

@juliannesermon8057 Жыл бұрын

Got startled by your desoldering pump, sounds like it's saying "Hallo" over a less than optimal analog radio connection.

@Zettymaster Жыл бұрын

3 videos in one month... Marco, are funds running low? Are you OK?

@thecatofnineswords Жыл бұрын

It’s a tool for calibration calibration tools. My goodness.

@rorywilliams5131 9 ай бұрын

"The LTZ1000 was continued in to the 8508A multimeter " . Are you sure about that , my dear friend ?

@reps 9 ай бұрын

Pretty high confidence in that statement pasteboard.co/G60gzQlQbIaZ.jpg Although maybe only early models?

@zyzzyva303 Жыл бұрын

Cliffhanger ...

@heronguarezi6501 Жыл бұрын

this was an open heart surgery with the patient still alive

@nickylarsen6207 Жыл бұрын

sadly, that ltz1000 board will demonetize the video...

@paradiselost9946 Жыл бұрын

we like BIG CRISPY FAULTS SO WE CAN REMOVE THEM AND MIRACULOUSLY FIX EVERYTHING! one can only dream of such an idyllic existence...

@ghydda Жыл бұрын

I am disappointed - either Marco failed at reverse engineering the circuit @29:43 - or at least he failed to comment on the very very very unusual configuration Q101-Q104 have been configured in. I demand an explanation. Otherwise, ❤ the vid'.