Ultra Precise Multimeter* Datron 4950 Repair** & Analysis

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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

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Опубликовано:

12 июл 2024

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Комментарии : 130

@reps Год назад

Happy #worldmetrologyday

@walterwhite2291 Год назад

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

@IanScottJohnston Год назад

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 Год назад

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

@Edisson. Год назад

@@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 Год назад

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 Год назад

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

@MeriaDuck Год назад

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

@MeriaDuck Год назад

I meant unobtanium of course

@jb3757 11 месяцев назад

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

@projectartichoke Год назад

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 Год назад

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

@JagerEinheit Год назад

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 Год назад

Blahhahahahah!

@marcus_w0 Год назад

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.

@namAehT Год назад

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

@JurassicJenkins Год назад

I’m grabbing a beer 😂

@austo2010 Год назад

This counts as CPD hours I think

@zyeborm Год назад

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

@Oscar_Kerkenaar Год назад

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! :)

@MoritzvonSchweinitz Год назад

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

@ericlotze7724 Год назад

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

@bansci Год назад

Beautiful Datron engineering again, thanks for the tour!

@akkudakkupl Год назад

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

@swebigmac100 Год назад

28:04 straight to the comments 😆😆😆

@Edisson. Год назад

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 Год назад

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

@Edisson. Год назад

@@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.

@siegmundeurades5753 Год назад

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

@Megabobster Год назад

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!

@JohnUsp Год назад

As always, an Awesome Video. Thank you Marco.

@tannerbass7146 Год назад

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

@ziginox Год назад

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.

@Sharkie1717 Год назад

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

@kayaker2k Год назад

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

@AmiPurple Год назад

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

@antoineroquentin2297 Год назад

Die Videos sind mit so viel Liebe gemacht.

@irritantno9 Год назад

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

@jamesmauer7398 Год назад

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

@chicoroth8679 Год назад

very, very impressive. thank you.

@supercompooper Год назад

Your voice is so soothing. On every level. 😊

@PCBWay Год назад

Fully aggree

@tnts999998 Год назад

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

@PCBWay Год назад

Fabulous as alwaysssss👍👍👍👍👍

@pomonabill220 Год назад

You always get the neat toys!!!!

@goober-ll1wx Год назад

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

@l3VGV Год назад

Yes, please!

@ericlotze7724 Год назад

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 Год назад

I read ' calibrating World Metrology Day' 🤣

@hermannschaefer4777 Год назад

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...

@floodo1 Год назад

this guy with the gamer humor and using MS Paint

@andymouse Год назад

Awesome !....cheers.

@floodo1 Год назад

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

@Angel_the_Bunny Год назад

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

@lostlullo Год назад

Nice graphic portal reference :)

@ricolorenz7307 5 месяцев назад

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 RU-vid, but instead it's one of the best. Also, the millisecond advantage joke was very funny Edit: 27:43 CLOSE YOUR EYES CHILDREN

@nickcaruso Год назад

precision adventure time!

@vincei4252 Год назад

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

@ericlotze7724 Год назад

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

@Momchil0 Год назад

Long video = good 30-90min is perfectly fine

@arthurdent8091 Год назад

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

@lohikarhu734 Год назад

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 Год назад

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

@derkarhu5079 Год назад

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

@derkarhu5079 Год назад

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

@PlaywithJunk Год назад

I like your EPROM eraser...

@lambda7652 Год назад

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

@Condurafly Год назад

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

@gbclab Год назад

Wow😊

@geemcd Год назад

❤ for Lemongrab x

@Txepetxcc Год назад

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

@VaZZoN Год назад

3rd video in 4-5 days ❤

@OmarMekkawy Год назад

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

@legobuildingsrewiew7538 Год назад

FINALLYHHHH

Год назад

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

@milk-it Год назад

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

@reedreamer9518 Год назад

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

@Dragonmastur24 Год назад

and silver does whiskers too!

@steubens7 Год назад

dungeon. one million years dungeon

@rahulkushwaha9500 Год назад

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.

@abacabdk3490 Год назад

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

@rushoffman965 Год назад

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 месяцев назад

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.

@TheRemo176 Год назад

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

@reps Год назад

I think that might be @HeleneVogelsinger shining through

@douro20 Год назад

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

@alexscarbro796 Год назад

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

@nrcha Год назад

Now that you have explained it, I can …

@sarahjrandomnumbers Год назад

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".

@Zadster Год назад

[Heavy Breathing Intensifies meme]

@appercumstock3017 Год назад

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

@FryChicken Год назад

Make a Multimeter Tier List

@VEC7ORlt Год назад

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

@t1d100 Год назад

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?

@AndersEinarHilden Год назад

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

@shazam6274 Год назад

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

@x1000plusx Год назад

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

@roboman2444 Год назад

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

@MoritzvonSchweinitz Год назад

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

@dawa11122 Год назад

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

@cambridgemart2075 Год назад

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

@molitovv Год назад

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 Год назад

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 Год назад

@@chefchaudard3580 Thank you

@tobimai4843 Год назад

The cutouts on the LTZ board look sus

@mikelemon5109 Год назад

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

@volkerracho5954 Год назад

"WOLLT IHR DEN TOTALEN PPM?!"

@Olli120 Год назад

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

@reps Год назад

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

@paradiselost9946 Год назад

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

@zyzzyva303 Год назад

Cliffhanger ...

@bootlegcaesar7481 Год назад

27:49 Sussy pcb

@thecatofnineswords Год назад

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

@Zettymaster Год назад

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

@heronguarezi6501 Год назад

this was an open heart surgery with the patient still alive

@juliannesermon8057 Год назад

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

@rorywilliams5131 9 месяцев назад

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

@reps 9 месяцев назад

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

@ghydda Год назад

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'.