Ultra Precise Multimeter* Datron 4950 Repair** & Analysis
ฝัง
- เผยแพร่เมื่อ 29 พ.ค. 2024
- 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 - วิทยาศาสตร์และเทคโนโลยี
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.
Wow! BAND LMT: OFF how did I not try that before 😮That is great!
Happy #worldmetrologyday
Holy cow 3 videos in a week, must be Christmas or something. 👍
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.
Time to look into the Präcitronic DC MV40-Milli-Pico meter again...
@@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 🤪
The sarcasm is a metrology grade, hermetically sealed no laughter masterpiece.
Precious.
That grey PCB looks like pure obtanium with parts worth their weight in some precious metal 😍
I meant unobtanium of course
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.
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.
Blahhahahahah!
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.
Unless this is is fairly modern, i.e RoHS compliant, I'm surprised to see tin whiskers.
Oh boy, I know exactly what I'm going to be doing for the next 32 minutes. Hint: Not work.
I’m grabbing a beer 😂
This counts as CPD hours I think
If your work is event tangentially related then I think this counts
"I enjoy making my videos less than half an hour long"...exactly at 30:00 ! 😀
Beautiful Datron engineering again, thanks for the tour!
16:36 …and I thought it was a mere LCD, but it is a gorgeous VFD !
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 TH-cam, but instead it's one of the best.
Also, the millisecond advantage joke was very funny
Edit: 27:43 CLOSE YOUR EYES CHILDREN
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! :)
That reference module has some 1930's Germany vibes :D
28:04 straight to the comments 😆😆😆
My Datron 1082 is easily my favorite tool to use 😊
They really made some slick equipment back in the day!
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.
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!
I for one am extremely happy with the release schedule as of late.
Waht is all this Multimeter talk on the Power station and vacuum cleaner channel
These videos are never too dense! All this talk about ppms sounds like lovely music
Wow that fast pass reference threw me back 20 years!
Nice video as always!
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
If it ain't broke, fix it till it is!
@@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.
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...
So funny! I love seeing all this metrology stuff. Can't wait for the next video.
Cool multimeter! I didn't know such devices existed with the very limited measurement ranges. Looking forward to the next video!
As always, an Awesome Video. Thank you Marco.
Finally a reps video that’s representative of all of my repair attempts. Ich liebe dich!
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!
I read ' calibrating World Metrology Day' 🤣
My mom says “pray tell”, surprised to hear it from non-American (-8. What a beauty that device is
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
Die Videos sind mit so viel Liebe gemacht.
very, very impressive. thank you.
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!!
Love it. The most recent firmware upgrade wiped out every last one of the few small complaints I had. Longer MXO4 vid coming ...
Cool... good to hear!
Both comments 🇨🇦🐻❄️🇩🇪
Btw, I have a couple of "general radio" 0,005% resistors that would be interesting to check out, 100k and 1,000M...
3rd video in 4-5 days ❤
Long video = good
30-90min is perfectly fine
Your voice is so soothing. On every level. 😊
Fully aggree
Impressive. I only wish I knew how, where, and why to use such a complex piece of tech.
You are on fire since some days! Please continue :)
Fabulous as alwaysssss👍👍👍👍👍
Marco, I can hear your solar power inverters whirring in the background. Seems to be a new permanent addition to the channel :)
Granted schedule is probably plenty full, but a mod (or better yet an Open Source Custom One!) would be a great video.
Looking forward to the video based on the research of my alma matar
I wish I were as smart as you, fascinating as usual!
this guy with the gamer humor and using MS Paint
Something about your videos is like crack for my senses. So good.
You always get the neat toys!!!!
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.
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.
Could the PTFE based PCB instead be chosen for low moisture absorption?
Nice graphic portal reference :)
I like your EPROM eraser...
Yes, please!
Awesome !....cheers.
Electrically illiterate me learned what is hermetically-sealed resistors are today. Thanks.
and silver does whiskers too!
No mention of the...unfortunate...form of the cutouts on the reference at 28:00 ?
he "commented" that on the ADR1000 video at 5:00 :P
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".
Fantastic video ! At 25:35, is that outerwilds I hear playing in the background by any chance ?
I think that might be @HeleneVogelsinger shining through
precision adventure time!
The 1281 makes a 3458A look very simple in comparison.
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?
Romancing the PPM's - its a nice hobby if you can afford it.
Wow😊
If it's not broken, fix it until it is!
27:30 *Trumpets start playing* " Auf der heide blut ain kleiness bluemelein... Und das heist: Erika"
"WOLLT IHR DEN TOTALEN PPM?!"
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.
Isolated solder iron = torch + piece of metal. Don't you have a ts100 and a battery that could've been used?
❤ for Lemongrab x
Oh no, here we have our entertainment for 32 minutes :D
dungeon. one million years dungeon
Pffff Reps...: the multitude of goodies you have collected!!
Just for the e-porn i need to watch it again.
I'll be calling voltage measurement competitive voltnutting from this point on.
TL431 has been sacrificed on the altar of PPMs.
Make a Multimeter Tier List
[Heavy Breathing Intensifies meme]
30 minutes does a justice to such devices. Lots of things learned and discovered!
Heatshrink Solder Sleeves are approved for military and aerospace use, so don't dismiss them so quickly!
New phrase / song for you: "Every Electron is Sacred"
to the music from: Monty Python's "The Meaning of Life"
Now that you have explained it, I can …
The cutouts on the LTZ board look sus
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?
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.
@@chefchaudard3580 Thank you
20:54 the laughing desoldering tool is not real, it cant hurt you
FINALLYHHHH
I had to think thrice when you said 18 years (recorded in 2018?) but then I remembered the 5 years. 2000+5+18=2023.
28:02 The circuit board of tolerance, right there. 🙈
that is great play of words, I might have to steal that if there's another opportunity
we like BIG CRISPY FAULTS SO WE CAN REMOVE THEM AND MIRACULOUSLY FIX EVERYTHING!
one can only dream of such an idyllic existence...
3 videos in one month... Marco, are funds running low? Are you OK?
Got startled by your desoldering pump, sounds like it's saying "Hallo" over a less than optimal analog radio connection.
"The LTZ1000 was continued in to the 8508A multimeter " . Are you sure about that , my dear friend ?
Pretty high confidence in that statement pasteboard.co/G60gzQlQbIaZ.jpg Although maybe only early models?
It’s a tool for calibration calibration tools. My goodness.
Cliffhanger ...
this was an open heart surgery with the patient still alive
Was 20:57 a Feel Good Inc. reference?
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'.
27:49 Sussy pcb
sadly, that ltz1000 board will demonetize the video...
Too many PLDs in there, just like HP3458 has one too many U180.
Not good for your wallet/sanity, if something breaks.
Yeah intermittent sucks. I'd rather install a couple new multifunctional smoke generators.
32min, has no clue. but watched till the end.
First viewer 🎉
Second…
damn, seconds after public :woke:
FIRSt
rep rep
27:44 somehow this circuitboard is playing this track watch?v=rcVb6l4TpHw