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- เผยแพร่เมื่อ 29 ก.ย. 2024
- What's inside the Keithley 2400 Source Measure Unit?
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Thanks for the upload. I can't wait to watch it. Love your channel.
The schematic has some obvious errors. For example, just above and to the left of the diode that connects to +36V there is a capacitor that obviously should be a resistor. Also, the output is not shown. And it's important to note that most of the supply rails have a "VF" suffix which stands for Voltage Follower, meaning that they track the output voltage. For example, the +15VF rail will stay 15V above the output, as the output goes up and down.
2410 is my favorite bit of equipment in the lab I work at.
Why is the copper plane around the pld and its clock not solid, but has little cutouts?
is there 15vf 30vf etc... the references
Come on people ,stop futzing ,Tuesday, Wednesday, Thursday .
As long as we get a video ,try doing Dave`s job and see how you do
Good on you Dave thanks for the videos
VR600 is the voltage reference. It is a 1N45749 6.4V zener, 5ppm/°C.
There's a SOT to the left of and below the PLD that is marked VR604 or something. May be it is the elusive reference :)
Yeah, VR600, on the right bottom of the huge altera chip
Man, i love this "U. S. A.!! U. S. A.!! U. S. A.!!" :D
Every time i see any usa mark i expect you to do it :D
Dear EEV Blog, Perhaps a you could tear down some musical keyboards analog synths or some pro audio equipment for a future tear down Video!
As an audio guy I'm totally agree with you, but seems Dave doesn't like the audio stuff.the only thing I saw in EEVblog was the Doug topics on microphone design.
imagine tearing down a Yamaha CS-80 with Daves commentary, or a cheap ass Korg EMX-1 with those valves(tubes).
dave DID teardown audio stuff , yamaha reciever and also yamaha (i think) keyboard a long time age.
Yeah. That would be great idea. Personally I would like to see hammer-action digital piano too (just like msynthesis).
Indeed! Perhaps Doug Ford has something cool in his garage for teardown. ;-) Great video, thanks!
If you want dave to teardown something related to audio, you should send him something really interesting in the mail to teardown. Maybe no one sends him any thing audio related!
I can't watch your HD because it's in 50Hz. My computer REALLY doesn't handle it well.
You really have to have a really crap computer if 50FPS video gives you problems.
It shouldn't be a problem for any computer these days.
Isnt it possible to change the quality settings? (Sorry, in phone so cant check)
I use a downloader to view (and archive) these _wonderful_ videos. I have the option to select standard OR high FPS HD video using the downloader, so I have to imagine it's possible. Not sure how the actual youtube options work, as my preferred browser doesn't natively play them in high FPS... YOu could always watch using a browser that _doesn't_ support high FPS vids! :P
richfiles
May I ask what downloader you use? Thank You
Dennis Minton addons.mozilla.org/en-US/firefox/addon/youtube-video-and-audio-dow/
Best youtube downloader hands down.
Love the higher fps! 50-60.THUMBS UP!
I wonder if the volt ref is made zener stile with the VR400 and VR401 as you can see at 16:04
They are put on holders and all away from the board while all others are flat on the board.
Together with the placement near high-end resisters and on the same height lengthwise to the volt reference test points.
I am actually watching this now in cental Europe on a Minix Neo H8+ on a 55hu7500 Samsung , it`s full hd(50hz) , i`ve checked it right now with the TV es own Y.Tube app , the same quality , good job Dave , and of course good equipment&editing (if we compare with episodes no. 1,2,3....) excellent advance , keep it up (in a few years 4k images&teardowns ??:-) :-)
Teardown Tuesday? It's Wednesday (nearly Thursday) what's going on ? :c
Definitley Thursday in Australia but guess it starts with a T so Teardown Thursday. I always start looking for the teardown vids on Tuesdays but more often than not they seem to be put up on Wednesdays, at least in Asia anyway.
Maybe because he tear down that stuff tuesdays and does not always have the time to process and upload the videos on the same day? Furthermore it doesn't matter... Great Video :) Greetings from germany
Former Keithley engineer, I used to work on these. VR600 is the A/D voltage reference zener. FYI, the Altera chip is a custom A/D which also routes serial data from the main micro to the range shift registers, analog muxes, and the DACs.
"Altera chip is a custom A/D"? => Is this mean use PLD to implement delta-sigma ADC?
@@jarodzs Yes, it has all the logic that makes the ADC.
Nice, that's what I was thinking. I guess he was looking for an integrated reference, but I suppose that diode is good enough for this level of precision.
Another teardown, big thumbs up! GJ Dave
VR600 diode = voltage reference. Below the FPGA.
that's what I thought, with a stable supply rail a zenner diode voltage reference might be enough.
Spot the cap that should be a resistor on the PA drawing!
Back around 2001, myself and a mate bought a few of these which were the 2400LV variant (high voltage disabled). I soldered a set of diodes into each one to make them "proper" 2400 units and we sold them on. Kind of wish I had kept one though.
Hardly a teardown, just taking the cover off..pfft.
For people wondering what the boards underneath look like there are pics on the eevblog forum. Luckily TiN did a real teardown :)
www.eevblog.com/forum/testgear/keithley-2400-sourcemeter-review-and-teardown/
That part marked as VR600 under the altera chip look like a zener diode.
I bet the vref is on the other side of the board, just tu fuck around with you :D
This is not your average hobby lab instrument, part due to higher cost and part due to specific function.
I never get tired of your teardowns.
Part of me wishes I could afford to ship you one of my vintage transistor or hybrid module calculators...
Alas, I find that I just can't bear the thought of parting with my _preeeeecious..._ ◔ᴗ◔
Not to mention 15-40 pound (about 7-18 kg) machines are not cheap to ship from the US! ◵_◵
For some reason, I think sourcemeter is only good for IV-curves. and leakage testing, LOL
use it as power supply---- not enough output capactance.
use it as a Eload, ---yeah I get better precision, but it is a lot more dangerous to use comparing to a good E-load
use it to generate pulse (pulse sourcemeter),---- slew rate (both voltage and current pulse) too slow ( mosfet or Op-amp circuit + signal generator can do it way better)
use it as DMM, --- yes a great DMM, also a much much expensive DMM
Dear EVVBlog, i have a problem with my 2400 SMU. When output is OFF or ON with Vsource=0, i really have -5,5 volts on output. Wht could be the reason of this?
That "1097" chip near the Vref test pin seems to be connected to that pin by the trace. I also spotted 74HC4094 8-stage shift-and-store bus register.
The unit consists of two PCBs, top and bottom. Can you go over the bottom PCB layer below the top PCB you are describing? The bottom PCB is for communication and power supply for the unit. My unit turns off and on by itself after a few minutes of power-on... It must be power supply problem. Any suggestions on how to fix it?
Looks like that heat sink is designed to not get in the way of disassembly! Just undo the two end screws, and it will probably slide right up when lifting the board. If not, there is an extra low number of screws (1 per two transistors) holding them to the heat sink via bits of cheap end aluminium U-tube. Definitely designed for ease of repair when needed.
Keep up the nice videos!! I recommend you analyse a PE4C mPCIE to x16 pcie adapter. I would like to know how this adapter works. It is a cheaper alternative to the alienware external gpu laptop package.
Hi, could you please do more design lessons? I enjoy your channel, but sadly the micro power supply design was fairly advanced and seemed like a one-off. It would be cool to see you design and explain similar circuits, especially with transistors and opamps.
Missing Connection Point between Collector Q521 and Source Q523. :-)
Tear down: Sony Walkman (New 2014)
Tear down Sony Walkman (80's)
At 16:23 you see VR216 and VR217 SOT23s near the top left corner. Voltage references?
I'd like to hear your thoughts on the FCC chief refusing to testify on plan to regulate the internet
Oh Yes!!!! Finally vie been waiting ages for this one. Thanks. SignalPath did a great video on the new model.
18:27 vr203 vr202 what are those for.. 4 th ic below the bar code thingy
At 22:23 I see VR202, VR203, VR600, VR601, VR602, all along the bottom.
Had to measure an optocoupler circuit at work, but I had to do it manually... took nearly an hour to go through the voltage range in tiny steps, and the PSU's voltage knob was a 1-turn pot.
My thoughts are with you, no one should work without the right equipment ;-) ^^
Dreaming of the day I get to put an SMU on my bench..
The discrete VR600 could be the ref voltage diode?
EEVblog If I remembered, NAiS is Panasonic.
Awesome video quality!
At time stamp 19:34 you can clearly see several parts labeled VR400, VR401, ... VR404. Could these be your missing voltage references?
lol
The devils resistor at 13:22, R666 oooeeer!
Wow, amazing video :-)
Make more uCurrents!
Look at 29:05 and on
Keithley love!
So in plain English please, what does an SMU do?
DMM and a precision voltage/current source and sink.
it can also measure current without any burden voltage. With appropriate software, it can characterise batteries or simulate a battery at any stage of charge ,which can save many hours.
Would appreciate teardowns of everyday objects more than this hightech stuff barely anyone ever uses
I find the irony of how you bash the high end audio people but then you do videos like this. Although there is a lot of BS in foolery in the audio world one could use your arguments about audio stuff on electronics tools.
But it isn't really the same thing, this is a scientific instrument for where a very high degree accuracy is essential. The BS in high-end audio has no scientific basis, especially stuff like audio cables.
I could easily argue why anyone could care about getting a voltage accurate down to 5 decimal places. I don't deny the BS, but at the same time using the same standards he did I can call BS on this if I felt like it. Anyone who hasn't heard truly high end audio equipment has no more of a right than I do to criticize this voltage reference.
lyokofans They are quite different. Audio quality relys on the Mk 1 ear while this is a testable scientific instrument for when you need to look for tiny variations. By the sound of things you are offended by this guys distain for audiophiles who spend a fortune on equipment with fancy claims. Indeed the marketing crud that gets peddled by these audio companies makes it hard to believe any claims they make. I can confirm that a properly set up listening room with professional multi-thousand $ gear sounds great. But does it sound multi-thousand pounds better than a PC with a USB DAC. class D amp and a decent pair of bookshelf speakers. Well to Mk 1 ears its entirely in the ears of the beholder. In fact sometimes with some older music I think cheap ass gear makes it sound better. Possibly as it was recorded to be enjoyed on such. :)
It depends if you want accurate reproduction or you want to distort the audio to make it the way you think it should sound. It is possible to get testable results with audio equipment. It isn't like audio equipment puts out random noise completely different from the input. Also class D amps are crap. They are only good for efficiency and that is about it. If you want fuller cleaner sound you have to use a class A+AB or class AB.
Aye I have seen setups that use microphones in the room to test the acoustics of the room and the like. However it all boils down to personal taste as to how you like the audio 'distorted' I like playing with different DACs, speakers and amps to try and get the most interesting results. Always love to hear what other people are playing with. Valves sound fascinating although that might be the theatricality of the glow. :)
6:51 USA USA USA USA