Dude! Where's your content! I was hoping for more of this test gear goodness and I'm left feeling bereft. :) Hey, if it's good enough for Mr. Reps, it's good enough for me!
21:00 No wonder it failed at that point, you mounted it on its side. This causes all the electrons to fall to the bottom of the hybrid chip and floods the ADC.
It's real stuff, very informative, educational, and interesting with a burst of small humors. We just can't help inadvertently watching till the end every time. ❤
Thanks for supporting this, and other youtube channels. I know its just business for you, but it seems that a bunch of the stuff you do is above and beyond what could be expected from a channel sponsor.
We had a saying at Keithley back in the late 80's and early 90's..."Nobody ever got fired for buying HP". We had a Josephson Junction standard and we monitored it with a 3458A. Incredible piece of engineering.
LOL, thanks for making my day with that tidbit. Bought/specified/recommended plenty of hp in my day. But I was always particularly happy to get Keithley. Great stuff.
Did you work on say the NIST reference volt? That is a thing of beauty there. Like a thousand perfectly over-filled cups of hot tea leveling off in a chain (the junctions in series AFAIK), poured while jogging so as to shake off the excess charge; I assume the antenna things are radiators.
@@TomAtkinson yes that was it. With a stable frequency reference the output was quantized very precisely. Small changes in frequency did not affect the output which was 8 to 9 digits stable and could be varied through a small range by increasing or decreasing the frequency until you got to the next "step". Was hungry for liquid helium though!
In the IT industry, that slogan used to be "Nobody ever got fired for buying IBM." The meaning is the same: The company is the risk-free option because they have been around forever and can be depended on, even if they aren't the cheapest.
16 minutes in and I've convinced myself I won't be looking for or trying to buy one of these. The pic of Rossmann holding a sign was the icing on the cake :-)
Thank you for the nostalgic tour! After an 18 year hiatus from Agilent, I sell EDA software for Keysight today...started with Hewlett-Packard in 1988 just out of EE university. Met Bill Hewlett and Dave Packard not too long before I visited Loveland Division on training tour. It is an incredible privilege to represent and sell products that thousands of HP/Agilent/Keysight geniuses have designed. These are products that design and test the technology that most people take for granted. Many of the largest customers today still use HP test gear that is 30+ years old! what lasting value. amazing. thank you Marco for this review of the HP 3458!
Steve how come today you cant just buy an analyzer that does more for less in a cabinet one 1:6 the size with todays chips ? (Im a plumber) So not holding any knowledge in this industry.
@@AboxofMonsters Yes. electronic test equipment is smaller and far lighter today..and far less expensive. CRTs have been replaced by flat panel displays...heavy transformers replaced by SMPSs...most signals under test are immediately digitized which allows wide analysis both in time and frequency domains - by using math vs hardware (as in old days).
As student of electronic engineering a love these types of videos. I also own the HP3458A. I bought it for 1,000 bucks from a company that went bankrupt.
The first production 3458a's were offered for sale in 1988, but our lab first started using early prototype test units around 1986 -ish.. If you own a 3458a, get the annual insurance policy from Keysight, and it won't cost nearly as much to keep the unit in good repair. It is a good value.
I was having a rough week and thought, "man, a Marco Reps or This Old Tony video would be really nice." It was. Thanks for coming through for me, buddy.
Wow, this is the first time I've watched your channel and I already love it! Halfway through I said out loud "how can they add all this complexity and not destroy the signal they are trying to measure"? And the humor, totally spot on! Off to watch more vids...
The binding post are special low thermal emf type. Made out of tellurium copper or beryllium copper. Sometimes directly gold plated with no adhesion layer such as nickel or chromium.
I used to live a mile away from the HP plant. Once a year they would have these open door events with pallets full of old stuff. For a budding electronics nerd such as myself this was heaven on a pallet! I'd spend $30 and came away with 200 pounds of stuff. I still have a few peltier cooler I got from HP.
This video deserves to be liked much more than one time. Alas, youtube restricts it to once per customer. What astounding troubleshooting. Thank you for making these videos.
5:32 The good old days of HP Journal, back when they put enough info out for some brave people to actually try to reproduce their magic. I'm submitting my engineering thesis tomorrow and it's basically my approach to constructing the TDC described in the April 1986 HP Journal, just modernized a bit and done without any custom IC magic (just some BFR93A's and BTF93's).
@@DavidNadlinger Hah, you and me both! Aside from getting bft93's and bft92's on ebay from shady sources, we're screwed. The world has decided that npns are enough for rf applications, so they stopped manufacturing fast pnps. The fastest pnp you can get from official sources is a painfully slow one (ft=400MHz or thereabouts, don't remember the part name) or you can pay an insane amount for an ic with 4 or 5 relatively fast pnps on a single die from Renesas (also don't remember the part number, but I remember it being >$10).
Jeez you have always been the most engaging electronic engineer on earth. Glad the channel is going well. Thankyou for showing me the cool stuff and explaining it all.
Just found this channel and I'm hooked! Informative, visually entertaining, and the brilliant sense of humor is an absolutely fabulous combination. ETA: Even your beverage selection is delightful. Bravo, sir!
Impressive video, and impressive repair! Thank you for producing such an excellent video about such an excellent meter. I am fortunate enough to have been given a 3457A as a gift from my Dad. It's not quite as powerful as its younger brother the 3458, it's still an amazingly capable meter to have on the bench! I'm glad you got your 3458 working properly. I hate the thought of such a meter being tossed into the e-waste bin.
Thank you for taking the time to make your videos. Informative and entertaining as always. I rebuilt a 3456a recently. Build quality of the old HP equipment is superb.
My dad worked on the 3458, as did one of my coworkers. They really threw everything they could into the design. I've always liked working on the HP designs from this era as they silkscreen around functional blocks to help us work on them.
We have a bunch of these at the calibration lab I work at, and was one of the first instruments that got me interested in precision. One unique use can be found in the Fluke 5520 service manual, where it measures some of the simulated capacitance with a 5700 and a 3458A using its sweep mode, since the frequency response is too low for an LCR to measure. Talk about overkill.
Great to watch, we have a trusty Datron 1271 for nearly 20 years and it is used for automated cal of production tools. Every year it gets shipped for Cal I get a bit more nervous and need a backup so am planning to pick up a 3458A as it is compatible.
That was freaking incredible. Incredible and damn hilarious. The fact that Marco went into “I ’m just gonna change every cheap component” was particularly honest and appreciated. Why is it I can never get anything complicated fixed??? Spectacular. I might have thrown away an immeasurable chunk of my life, but it had some real pleasure to it . . .
Excellent video and it is good that you have included an important step omitted by most other videos. They all clean the instrument but most forget to sanitize the operator with an ethanol solution. Since dirty operators often contribute to the problem it is best to clean them before, during, and after repair and/or calibration. Good luck with your videos.
Very amusing Sir. Like your dry wit. Most interesting from a technical perspective also. I have designed several dual-slope ADC's over the years - first one about 1975 using an LM741 & LM311 believe it or not. Worked jolly well.
I worked at a very small business two years ago few month before covid were I was the only employee and I was mounting and soldering together easy pcbs. I had worked there for some weeks when one day a familiar designed instrument on the shelf caught my eye. It was a HP 3458A that had not been used for many years but looked like new, I drooled. The fun part is that the company never ever needed the precision it could give for what was made. An calibrated handheld fluke DMM was enough.
Been waiting for you to step into this world as it is a world standard piece. You have fabulous gear and excellent taste in instrumentation. Can’t go wrong with your choices. Looking forward to more fun in the Marco Reps World. Stay safe my mates!😊👍🏻😷
dude, you are the first one who was capable of explöaining how a adc works. everyone be like, "its just a chip, dont question it" and i hate no knowing things i want to know... you exlplaied it very well, and you wont beleve how thankful i am for that!
I have been studying for the very tedious PE ECC exam, that has me hating my electronics right now. This hard-core electrics video made me like it again :D so thanks.
baking soda and super glue make a great plastic filler and can be filed into shape. I even replaced snap clamps on plastic cases and the hinge peg on my cars visor mirror cover. You can brush on or dip the part in super glue and sprinkle on baking soda, repeat until you build up the missing plastic, then file or sand to shape.
I have actually repaired resin intake manifolds using this method. Amazed a co-worker over 20 years ago by repairing the intake manifold on his car that way. One thing I learned over the years is to use the runny, original style super glue. The gel style does not work as well and sometimes not at all.
Although your subject material is way over my head, your content is such good quality it makes it my favorite regardless. The chase after precision and its effects are intriguing and really makes me feel nothing but awe and gratitude towards all the brilliant people throughout history that have dedicated their lives and propelled the human race to what we are today. Greetings from the low lands!
Dude for someone at your level to resort to "brute force replace everything on the board" speaks volumes. I'm really glad you got it fixed, I'd give anything to have something half as good . It sucks that you had to trade in, I'd like to have seen what Extra Solar found inside that U180.
I have and still use an HP3478A Multimeter from 1983. After 38 years, still running strong and reliable. I also Have a Tektronix 465 oscilloscope prototype. It has a pre-production digital storage unit on top where the optional multimeter would go. It's so rare Tektronix couldn't tell me anything about it, and didn't even know it existed. When they added them in production a year or two later, they fit it inside the regular chassis and added the controls to the front. Sadly the picture tube blew out a few years ago.
Dmanit TH-cam, why didn't you alarm me that a new Marco Reps video was up? I needed that sexy voice and dry German humour so badly. Seriously Marco, your videos do make my day because of those little "IPA---- oops..." jokes have me crying with tears. Oh and there's the guy from New York with his little sign! Go LOUIS!
I just received 3 separate emails asking about 3458A purchasing advice. Here's all I know in a TL;DR: The prices, even for used and untested meters, are very high at the moment. No internal self test or ACAL can guarantee a good ADC, sometimes they start drifting slowly a few months before they finally start giving convergence errors. If possible you have to power on the meter and have it measure a trustworthy DCV standard for a week. Or test it per Service Note 18A: literature.cdn.keysight.com/litweb/pdf/3458A-18A.pdf Nobody seems to know what exactly causes these problems or how to cure them. In the grand scheme of things the dreaded U180 problems are rather rare. Because there are probably hundreds of thousands of these multimeters in use in the industry and in cal labs all around the world. The number of bad U180 cases is small in comparison: A few forum posts, youtube videos here and there ... On the other hand buying a used meter has increased chances of getting a bad one, because of course people will try to get rid of them after learning about the repair costs. Probably the safest way to go is buying from a company that specializes in used test equipment and is willing to offer a guarantee. i.e. www.ab-precision.de/ in Germany might be a good source. Good luck!
I actually loved the simulation section, it's interesting to see how they parallelised the analog to digital conversion by basically splitting the input
I am definitely one of those two and a half. I Love the logic explanation! Please Keep this trend! I learn more from you than just about anywhere else!
I found an HP 3457A that I am using in the 7 1/2 digit mode with the Xdev mods. This reliably gives me about 10 microVolt accuracy. With a good calibration I think I can do better. Supposedly it is 5 ppm stable. Best Wishes!
Great video! It reminds me my times in the seventies in a calibration and repair lab. But by then, the HP equipments were stil from the previous generations. Nevertheless, I have learned a lot reading the theory of operation and understanding all the schematics especially when there was a malfunctioning.
... and thought to themselves, "why don't we make that a million times more complicated?" First time I've seen one of your videos. #1 Hilarious commentary and context #2 Simultaneously in awe of the sheer electronics passion and UNDERSTANDING this all requires #3 if there was a German version of the robot reverse-transcription voice and delivery, yours might be good as a tutorial for that :). #4 hugely enjoyable and fascinating. Just subscribed. Thank you!
Sometimes diagnosis of the fault can be as simple as re-seating IC’s into their sockets. Other times, ‘Freeze-Spray’ can be used to detect leaky resistors, caps, FET’s , diodes junctions and even BJT transistors, that could have helped you find the leaky 2N4392 JFET more quickly. Thereafter replacing parts as done in this meter repair. Congratulations with your repair success, all while saving thousands of dollars, having the sanctification you fixed it and gaining all the learning acquired. So overall, a win in many ways.
Many faulty BGA, wirebond or flipchips can be brought back into working order by reheating the die area with temperature slightly less than the solder melting temperature. The thermal expansion of the die fixes most problems. If you have nothing to loose, try it.
Not sure which is the greater labour of love: the inestimable 3458A or the video thereof. Genuinely "epic". Well done on both counts (DMM pun unintended). Great humour...
Excellent video! Really lovely to see this working again. If you're looking for higher vertical resolution measurement on the cheap, for future analysis, take a look at some of the Red Pitaya kits. Their 14-bit options start at under 300€ for a 2-channel 60MHz option, and they double up as a transmitting SDR (2x recv, 2x transmit). The software for them is open source, too!
I never would have thought a 30 year old multimeter repair could be so dramatic and exciting to watch, especially considering I only understand about 5% of what's happening.
Super glad you've repaired it !! Marco Reps: Look after his name, as he is destined for greatness !!
Dude! Where's your content! I was hoping for more of this test gear goodness and I'm left feeling bereft. :)
Hey, if it's good enough for Mr. Reps, it's good enough for me!
@@marcdraco2189 the channel was lately "revamped" in a certain sense . The gear goodness and all sorts of ppms :) will be available pretty soon !!
@@pitushi First time subbing to someone with 0 videos based on a single lab image :D
Well done on donating the meter!
dude, add some content to your channel, we want to see some of your work
21:00 No wonder it failed at that point, you mounted it on its side. This causes all the electrons to fall to the bottom of the hybrid chip and floods the ADC.
it all makes sense now 🙈
No sir, it was just unhappy to be standing sideways. It demands respect
@@anhthiensaigon lmao
🤣🤣🤣🤣🤣
@@reps gigachad marco
"It just means some non-volatile memory was not even able to do its one job in life: remembering stuff." - Oh god my sides.
I can relate to that chip
It's real stuff, very informative, educational, and interesting with a burst of small humors. We just can't help inadvertently watching till the end every time. ❤
Thanks for supporting this, and other youtube channels. I know its just business for you, but it seems that a bunch of the stuff you do is above and beyond what could be expected from a channel sponsor.
You guys are awesome. Love your company.
This is a good description for what i look for in most things i watch on TH-cam
@@ztechrepairs k0
Pcb wayyyyyyyyy I love you
We had a saying at Keithley back in the late 80's and early 90's..."Nobody ever got fired for buying HP". We had a Josephson Junction standard and we monitored it with a 3458A. Incredible piece of engineering.
LOL, thanks for making my day with that tidbit.
Bought/specified/recommended plenty of hp in my day. But I was always particularly happy to get Keithley. Great stuff.
Try buying some of their crappy computer stuff these days. It is utter garbage.
Did you work on say the NIST reference volt? That is a thing of beauty there. Like a thousand perfectly over-filled cups of hot tea leveling off in a chain (the junctions in series AFAIK), poured while jogging so as to shake off the excess charge; I assume the antenna things are radiators.
@@TomAtkinson yes that was it. With a stable frequency reference the output was quantized very precisely. Small changes in frequency did not affect the output which was 8 to 9 digits stable and could be varied through a small range by increasing or decreasing the frequency until you got to the next "step". Was hungry for liquid helium though!
In the IT industry, that slogan used to be "Nobody ever got fired for buying IBM." The meaning is the same: The company is the risk-free option because they have been around forever and can be depended on, even if they aren't the cheapest.
16 minutes in and I've convinced myself I won't be looking for or trying to buy one of these. The pic of Rossmann holding a sign was the icing on the cake :-)
I'm definitely getting a Keysight one as soon as I graduate from electrical engineering. This thing is so fucking sexy.
Thank you for the nostalgic tour! After an 18 year hiatus from Agilent, I sell EDA software for Keysight today...started with Hewlett-Packard in 1988 just out of EE university. Met Bill Hewlett and Dave Packard not too long before I visited Loveland Division on training tour. It is an incredible privilege to represent and sell products that thousands of HP/Agilent/Keysight geniuses have designed. These are products that design and test the technology that most people take for granted. Many of the largest customers today still use HP test gear that is 30+ years old! what lasting value. amazing. thank you Marco for this review of the HP 3458!
Steve how come today you cant just buy an analyzer that does more for less in a cabinet one 1:6 the size with todays chips ? (Im a plumber) So not holding any knowledge in this industry.
@@AboxofMonsters Yes. electronic test equipment is smaller and far lighter today..and far less expensive. CRTs have been replaced by flat panel displays...heavy transformers replaced by SMPSs...most signals under test are immediately digitized which allows wide analysis both in time and frequency domains - by using math vs hardware (as in old days).
As student of electronic engineering a love these types of videos. I also own the HP3458A. I bought it for 1,000 bucks from a company that went bankrupt.
that was a great deal even if it happened before the crazy price hike of the last couple of years. now even more so!
No one else could make the explanation of a 33 year old circuit more captivating. Thanks, those Loveland engineers sure we're a crafty bunch.
The first production 3458a's were offered for sale in 1988, but our lab first started using early prototype test units around 1986 -ish.. If you own a 3458a, get the annual insurance policy from Keysight, and it won't cost nearly as much to keep the unit in good repair. It is a good value.
It's impressive that it's possible to obtain insurance for a 30 year old piece of equipment.
@@thecatofnineswords when it's such a high end laboratory equipment yeah, it's kinda of a norm
After the intro, I kept wondering what would compel somebody to give away such a piece of history. The next 25 minutes was all the answer I needed.
45 minutes?!
Thank you Marco for this amazing gift!
I was having a rough week and thought, "man, a Marco Reps or This Old Tony video would be really nice." It was. Thanks for coming through for me, buddy.
I have no idea what's going on but can tell clearly that I'm witnessing greatness
23:00 that ESD clamp must hurt, quite the dedication.
WTF
why does he do it like that!
As someone who troubleshoots complex systems for a living, this kind of work is inspiring!
Marco is a beast
Oh boy, the voice, the technical talk, oh boy, so damn good. And I'm just couple of minutes in, cheers Marco
Grab a box of tissues and join us
@@jonathangallant-mills6434 its close to "Kraftwerk" i suppose
A little odd as a voice.
Wow, this is the first time I've watched your channel and I already love it! Halfway through I said out loud "how can they add all this complexity and not destroy the signal they are trying to measure"? And the humor, totally spot on! Off to watch more vids...
That is an... _interesting_ and painful looking way of grounding yourself. Beautiful machines, I've been coveting them for years.
Can't even imagine how long it took to film, edit, script and narrate this... Oh, also the repairs themselves. Thank you!
The binding post are special low thermal emf type. Made out of tellurium copper or beryllium copper. Sometimes directly gold plated with no adhesion layer such as nickel or chromium.
I used to live a mile away from the HP plant. Once a year they would have these open door events with pallets full of old stuff. For a budding electronics nerd such as myself this was heaven on a pallet! I'd spend $30 and came away with 200 pounds of stuff. I still have a few peltier cooler I got from HP.
This video deserves to be liked much more than one time. Alas, youtube restricts it to once per customer.
What astounding troubleshooting. Thank you for making these videos.
5:32 The good old days of HP Journal, back when they put enough info out for some brave people to actually try to reproduce their magic. I'm submitting my engineering thesis tomorrow and it's basically my approach to constructing the TDC described in the April 1986 HP Journal, just modernized a bit and done without any custom IC magic (just some BFR93A's and BTF93's).
Since you mentioned the BFT93: Do you know of any fast (GHz-class) PNPs that are still in production? BFT92 going obsolete really screwed me over…
@@DavidNadlinger Hah, you and me both! Aside from getting bft93's and bft92's on ebay from shady sources, we're screwed. The world has decided that npns are enough for rf applications, so they stopped manufacturing fast pnps. The fastest pnp you can get from official sources is a painfully slow one (ft=400MHz or thereabouts, don't remember the part name) or you can pay an insane amount for an ic with 4 or 5 relatively fast pnps on a single die from Renesas (also don't remember the part number, but I remember it being >$10).
8:12 "No Quirks and Features will be left out" - Is this the Doug Demuro of precision instruments?
I may not understand your passion for PPMs, but I certainly enjoy watching you chase them.
Hair clippers @ 20'51'' is brilliant. Thanks for another great video :)
Your videos are so technically absorbing, and your switchblade thru the heart humour is to die for. Cheers!
Jeez you have always been the most engaging electronic engineer on earth. Glad the channel is going well. Thankyou for showing me the cool stuff and explaining it all.
Just found this channel and I'm hooked! Informative, visually entertaining, and the brilliant sense of humor is an absolutely fabulous combination.
ETA: Even your beverage selection is delightful. Bravo, sir!
Fantastic video. I keep dipping back into your archive as there is so much to take on, its impossible to catch it all on the first view.
Impressive video, and impressive repair! Thank you for producing such an excellent video about such an excellent meter.
I am fortunate enough to have been given a 3457A as a gift from my Dad. It's not quite as powerful as its younger brother the 3458, it's still an amazingly capable meter to have on the bench! I'm glad you got your 3458 working properly. I hate the thought of such a meter being tossed into the e-waste bin.
Truly stunning work. Congratulations on the fix.
Thank you for taking the time to make your videos. Informative and entertaining as always.
I rebuilt a 3456a recently. Build quality of the old HP equipment is superb.
I calibrate a lot of 3458A's and it's really cool to see this type of work because we don't do any component level repair.
1 PPM per Month, that almost made me choke.
And a cal every 1°C, now that's presision.
That's an excellent ground strap you've got there at 23:33!
These sens of bonedry humor and this deep diving in electronics .. I just love it!
#allmightyBiegelehre
Bone dry humour and Metal Gear Solid reference!! Brilliant!
My dad worked on the 3458, as did one of my coworkers. They really threw everything they could into the design. I've always liked working on the HP designs from this era as they silkscreen around functional blocks to help us work on them.
Outstanding video Marco, your whit and comments add to the extreme complexity of your videos. Louis
We have a bunch of these at the calibration lab I work at, and was one of the first instruments that got me interested in precision. One unique use can be found in the Fluke 5520 service manual, where it measures some of the simulated capacitance with a 5700 and a 3458A using its sweep mode, since the frequency response is too low for an LCR to measure. Talk about overkill.
Wow, please send me one, lol.
with every new video I see , I am extremely impressed with your skill set and abilities.
Great to watch, we have a trusty Datron 1271 for nearly 20 years and it is used for automated cal of production tools. Every year it gets shipped for Cal I get a bit more nervous and need a backup so am planning to pick up a 3458A as it is compatible.
That ADC.... They basically made calculus happen in their board, guys are brilliant
Regardless of length or complexity I'm hopelessly addicted to your video! Thank you :)
Ihre Videos sind immer das Highlight des Tages! Vielen Dank und weiter so!
Macroreps 45minute video full of his relaxing voice. This is gold in itself.
I just watched this and didn't understand a thing 10/10 would watch again.
That was freaking incredible. Incredible and damn hilarious. The fact that Marco went into “I ’m just gonna change every cheap component” was particularly honest and appreciated. Why is it I can never get anything complicated fixed??? Spectacular. I might have thrown away an immeasurable chunk of my life, but it had some real pleasure to it . . .
I love these new types of extremely nerdy videos you're posting! I don't understand anything! It's a thrilling ride!
Excellent video and it is good that you have included an important step omitted by most other videos. They all clean the instrument but most forget to sanitize the operator with an ethanol solution. Since dirty operators often contribute to the problem it is best to clean them before, during, and after repair and/or calibration. Good luck with your videos.
I love your dry humour. Wonderful. Thank you for making my day.
This is the best meter review I have ever seen.
Very amusing Sir. Like your dry wit. Most interesting from a technical perspective also. I have designed several dual-slope ADC's over the years - first one about 1975 using an LM741 & LM311 believe it or not. Worked jolly well.
I worked at a very small business two years ago few month before covid were I was the only employee and I was mounting and soldering together easy pcbs. I had worked there for some weeks when one day a familiar designed instrument on the shelf caught my eye. It was a HP 3458A that had not been used for many years but looked like new, I drooled. The fun part is that the company never ever needed the precision it could give for what was made. An calibrated handheld fluke DMM was enough.
3458A often bought not for precision, but for speed. It can do very very fast measurements (some folk can even digitize 50 MHz signal with 3458A ;).
@@xDevscom_EE Cool stuff. But we didn't needed fast measurements either to what we did. I think the boss bought it just because. :)
Been waiting for you to step into this world as it is a world standard piece. You have fabulous gear and excellent taste in instrumentation. Can’t go wrong with your choices. Looking forward to more fun in the Marco Reps World. Stay safe my mates!😊👍🏻😷
I'm impressed.. good work. And so good to see Louis Rossman in your video (right to repair) 15:02
Thank you for sharing ..
Your videos are always a treat, glad to see you finally get to the promised land of metrology
You have no idea how excited I got when I saw a 45 minute Marco Reps video in my feed
dude, you are the first one who was capable of explöaining how a adc works. everyone be like, "its just a chip, dont question it" and i hate no knowing things i want to know...
you exlplaied it very well, and you wont beleve how thankful i am for that!
If you could not explain you do not understand.
I have been studying for the very tedious PE ECC exam, that has me hating my electronics right now. This hard-core electrics video made me like it again :D so thanks.
Good luck!
Nobody will take my 3458A from me.......I'm making sure my coffin will be big enough for it as well.
baking soda and super glue make a great plastic filler and can be filed into shape. I even replaced snap clamps on plastic cases and the hinge peg on my cars visor mirror cover. You can brush on or dip the part in super glue and sprinkle on baking soda, repeat until you build up the missing plastic, then file or sand to shape.
I have actually repaired resin intake manifolds using this method. Amazed a co-worker over 20 years ago by repairing the intake manifold on his car that way. One thing I learned over the years is to use the runny, original style super glue. The gel style does not work as well and sometimes not at all.
@@capriracer351 the only kind i have ever known is the drip all over your fingers kind
What a joy to watch! What an amazing masterpiece of engineering
I love this guys' delivery. Even I could get excited by a multimeter.
Although your subject material is way over my head, your content is such good quality it makes it my favorite regardless. The chase after precision and its effects are intriguing and really makes me feel nothing but awe and gratitude towards all the brilliant people throughout history that have dedicated their lives and propelled the human race to what we are today.
Greetings from the low lands!
My sentiments entirely!
Dude for someone at your level to resort to "brute force replace everything on the board" speaks volumes. I'm really glad you got it fixed, I'd give anything to have something half as good . It sucks that you had to trade in, I'd like to have seen what Extra Solar found inside that U180.
this device is worth a fortune! you have some generous subscribers! Congratulations
I have and still use an HP3478A Multimeter from 1983. After 38 years, still running strong and reliable.
I also Have a Tektronix 465 oscilloscope prototype. It has a pre-production digital storage unit on top where the optional multimeter would go. It's so rare Tektronix couldn't tell me anything about it, and didn't even know it existed. When they added them in production a year or two later, they fit it inside the regular chassis and added the controls to the front. Sadly the picture tube blew out a few years ago.
I like you. Because you are informative and you are not trying to sell crap or "diy soldering station" things.
Dmanit TH-cam, why didn't you alarm me that a new Marco Reps video was up? I needed that sexy voice and dry German humour so badly.
Seriously Marco, your videos do make my day because of those little "IPA---- oops..." jokes have me crying with tears.
Oh and there's the guy from New York with his little sign! Go LOUIS!
I just received 3 separate emails asking about 3458A purchasing advice. Here's all I know in a TL;DR:
The prices, even for used and untested meters, are very high at the moment.
No internal self test or ACAL can guarantee a good ADC, sometimes they start drifting slowly a few months before they finally start giving convergence errors.
If possible you have to power on the meter and have it measure a trustworthy DCV standard for a week. Or test it per Service Note 18A: literature.cdn.keysight.com/litweb/pdf/3458A-18A.pdf
Nobody seems to know what exactly causes these problems or how to cure them.
In the grand scheme of things the dreaded U180 problems are rather rare.
Because there are probably hundreds of thousands of these multimeters in use in the industry and in cal labs all around the world.
The number of bad U180 cases is small in comparison: A few forum posts, youtube videos here and there ...
On the other hand buying a used meter has increased chances of getting a bad one, because of course people will try to get rid of them after learning about the repair costs.
Probably the safest way to go is buying from a company that specializes in used test equipment and is willing to offer a guarantee.
i.e. www.ab-precision.de/ in Germany might be a good source.
Good luck!
I actually loved the simulation section, it's interesting to see how they parallelised the analog to digital conversion by basically splitting the input
80% of what you describe in your videos is over my head, but God do I love your channel!
I like how the steering hybrid is one of the few things keeping you from making one of these from scratch
What an outstanding video Marko, love your cometary style, you are fast approaching HP greatness!! Louis
I am definitely one of those two and a half. I Love the logic explanation! Please Keep this trend! I learn more from you than just about anywhere else!
So happy for discovering this new channel!
I found an HP 3457A that I am using in the 7 1/2 digit mode with the Xdev mods. This reliably gives me about 10 microVolt accuracy. With a good calibration I think I can do better. Supposedly it is 5 ppm stable. Best Wishes!
You know what amazes me about your channel? It's that you could pull of 50k views in just two days. Well done mate
Congrats! Always great to get an awesome reward at the end of the long road!
Your workshop and equipment drive me crazy ! What a wonderfull place with absolutely lovely devices... ! I love it !
I still use one every day as a calibration technician. And have used HP and the AGILENT ones.
I have never in my life seen someone use clippers to cut the through leads off a circuit board. You're getting a sub just for that.
I have no idea what you're talking about but it's still super entertaining!
Great video!
It reminds me my times in the seventies in a calibration and repair lab. But by then, the HP equipments were stil from the previous generations.
Nevertheless, I have learned a lot reading the theory of operation and understanding all the schematics especially when there was a malfunctioning.
You came a very long way, but you finally arrived!
I spent time with a 3458A on my bench for a few years in the 90s. It was a sublime piece of gear back then when new.
45 mins of pure joy and entertainment
👏👏👏👏
The animations you've included are brilliant!
Absolutely fantastic work as always!
I see vacuum stuff in the background!!!!! Can't wait for the vacuum series :D
... and thought to themselves, "why don't we make that a million times more complicated?" First time I've seen one of your videos. #1 Hilarious commentary and context #2 Simultaneously in awe of the sheer electronics passion and UNDERSTANDING this all requires #3 if there was a German version of the robot reverse-transcription voice and delivery, yours might be good as a tutorial for that :). #4 hugely enjoyable and fascinating. Just subscribed. Thank you!
I love your voice and how you roll off the final worrrrrd. Sounds very cool.
Sometimes diagnosis of the fault can be as simple as re-seating IC’s into their sockets. Other times, ‘Freeze-Spray’ can be used to detect leaky resistors, caps, FET’s , diodes junctions and even BJT transistors, that could have helped you find the leaky 2N4392 JFET more quickly. Thereafter replacing parts as done in this meter repair. Congratulations with your repair success, all while saving thousands of dollars, having the sanctification you fixed it and gaining all the learning acquired. So overall, a win in many ways.
I could watch your work all day, why did it have to end ! great stuff...cheers.
Many faulty BGA, wirebond or flipchips can be brought back into working order by reheating the die area with temperature slightly less than the solder melting temperature. The thermal expansion of the die fixes most problems. If you have nothing to loose, try it.
Not sure which is the greater labour of love: the inestimable 3458A or the video thereof. Genuinely "epic". Well done on both counts (DMM pun unintended). Great humour...
Excellent video! Really lovely to see this working again.
If you're looking for higher vertical resolution measurement on the cheap, for future analysis, take a look at some of the Red Pitaya kits. Their 14-bit options start at under 300€ for a 2-channel 60MHz option, and they double up as a transmitting SDR (2x recv, 2x transmit). The software for them is open source, too!
First time seeing this channel. Man, you are passionate about multimeters.
Celebration time, another great video. Full stop and coffee time 🎉
I never would have thought a 30 year old multimeter repair could be so dramatic and exciting to watch, especially considering I only understand about 5% of what's happening.