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- เผยแพร่เมื่อ 26 ส.ค. 2024
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Teardown Tuesday.
What's inside Rigol's new DS2000 series entry level oscilloscope?
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The ones in the power supply? Those are part of the feedback path for the switching controller. The switching part of the supply has to be isolated from the output, so either the switch control signals or output voltage feedback has to be sent across the galvanic isolation in the supply for it to work properly. Every isolated line powered switching supply has at least one. Looks like this one has 4, though I am not sure why. I presume one of them is for the AC line trigger.
About those hidden chip numbers, a friend of mine who manufactures bonding solutions tells me he has a customer in the electronics business who uses a special solution to bond stuff to chips to conceal their identity. Apparently it's so strong that once treated you've got more chance of destroying the chip than getting the darned number off it. Looks like technology progresses everywhere, I can remember when numbers were just dremmelled off.
You know, there's a Dave's Law - When you already want to go to bed, Dave uploads new video.
It's the LAW, and you can't do a sh#t about it! ))
I love the Torx screws everywhere. Most of those isolation slots on the PSU probably aren't even required, but they've put them in because they're doing some anyway. Good approach.
Yes, I think I've seem something similar somewhere, but cannot recall.
I've yet to watch more than a few seconds of the video but I'm giving it a thumbs up based on the doc brown license plate in the background alone. GREAT SCOTT!!!
They are just (low noise?) linear voltage regulators. Powering some or all aspects of the front end circuit. They needed something like this to enable the 500uV/DIV range.
My Rigol equipment has been stellar.
They have been doing everything right and if they keep it up I can see them competing directly with the big boys. I have two pieces of rigol gear and I am considering a third.
Obviously no competition from that DSO you reviewed the other day :)
Great review as always.
regs near front end - maybe seperate linear regs for clean supply to analogue bits.
Damn, it's a nice one, Dave. Dear Santa...
Kickstarter project! After-market clear covers for test gear! Fluke did this with a special edition of the 87-V for example.
They are calculated based on the required impedance and type of material used.
I found the same match. The Rigol is 2GS/s though. But I'm pretty certain this would just be relabeled off-the-shelf chip. There are suitable ones on the market, so you'd be crazy to spend huge $ rolling your own.
No kidding?! Sweeeet. They should be really proud of their work. Too bad it is rarely seen.
Kickstarter project is a great idea. I've been in IT for many years and lost touch with the electronics test gear market. I'd crash and burn but somebody should seriously do it. These engineers really need their work showcased.
another great teardown. Thanks dave!!!
The 70MHz version is US$839 retail. The 200MHz unit is identical hardware wise.
Possible, yes. Trivial? No idea, no one has done it.
That was my first thought, but it doesn't look like it's actually removed material. Notice how it actually dips into the indent on the chip at 14:20
The chips under the input cans might be lasered off, but it seems like a really crappy job of it to me. Might just be a really, really faint marking.
It's the Extech MC108 digital microscope, as you saw in the video. Pretty useless for most things, but pretty good for looking at part numbers on chips. In this case it didn't work so well because the metal shielding can got in the way (it needs to be right on top of the chip).
Sticky cable tie bases ALWAYS fall off eventually.
Dave, I'd Almost bet money the sticker you we fussing with on that clock chip was a heatsink! Check out Stick-it Flexible (AKA Cerac α) I've seen a couple products like it that increase the emission of heat into the air. I bet the folks at Rigol needed to take the temperature of that chip down just a few degrees. (Almost used something similar myself once)
I did a quick search on digikey for dual input ADCs in 144 pin QFPs and came up with a reasonable guess as to what that chip is. I think it miiight be a ADC08DL500CIVV/NOPB-ND which is a 500msps dual 8 bit ADC made by national. The pinning seems to match from what I can tell (diff pairs, inputs along the bottom row, etc). If it isn't an exact match it must be very, very close.
Not yet.
EPCOS caps seems to be from a TDK division, good quality German caps. They are not Panasonic but they they still make very good quality caps and inductors.
Hmm, interesting, could be. That would explain it's "paint like" nature when I tried to scratch it off.
So many goodies!
EEVblog Could you probably do a comparison teardown with one or two similar entry-level DSOs like the current Owon or UniT series? I'm sure a lot of aspiring tinkerers would love your opinion on which ones are most worth their price.
Some silicon stuff to prevent the components from vibrating (: If you're a hobbyist, you'd probably use hot glue instead.
Dave, when you took the back cover off my first reaction was, "Why the hell did they put that ugly plastic cover over such a beautiful full metal shield?" Makes me want to do a couple of mods and show it off. 1. Powder coat the shield. 2. Silk screen on a large Rigol logo. 3. Vacuform a clear acrylic shell to replace the plastic cover.
Where I'm from (Canada) it's usually right after I ate supper, when I want to relax :)
The mystery clock chip looks like an ADF4360-x from Analog Devices which is a PLL with integrated VCO. Connecting a 4k7 resistor to pin 13 will set the charge pump current to 2.5mA =). The other pins seem to match as well.
Awesome work a 3:14 :) I almost didn't notice!
IMHO there is a little error in pcb design of clock provider unit for Rigol's custom ASIC (14:30). Most of AD's clock synths requres perpendicular positioning for its two LC's (on screen) circuits - for decreasing inductance coupling between L's.
Nice scope. None on eBay yet, the sellers must be trying to shift all their 1000-series first :)
Hey Dave. I'm pretty sure they have laser engraved the front of those chips off and not stuck anything on them.
Maybe they are using Rui Feng chips for adc, they have National clones in dual 1 GS/s.
Best Chinese made power supply I've ever seen I think. If only this was normal and not the exception.
It's still there. This one is double the price, so it hasn't been superceded.
I dont understand anything you talk about but i still love your videos :P
I see wiha screwdriver on yer desk, proud of ya mate
BRGD = background debug? - pretty sure I've seen this as a debug/program interface for a MCU - con;t recall which manufacturer
So they can make money selling different bandwidth models. Standard practice.
The 200MHz model is the exact same hardware as the 70MHz model, but costs double.
Rigol : Beyond measure < nice etching
6.3V is indeed the voltage for most valve heaters. There must be a vavlve in there somewhere! *cough* :P
Didn't you see it in use? It's his ExTech digital microscope, which failed compared to the stereo Mantis used a sec after ;-)
I always smile when I see ISSI devices, because in my language it means "daddy".
Wonders what would happen if you used a scope to probe its own internals...
Holy shit this video is compressed to be a 1080p vid, dam youtube this is kinda extreme..
Yep, already shot, coming soon.
Why do they put heat-shrink on the inductors?
How can I possibly know your requirements?
Hi Dave, i have a question.
Why there's no powerplane (gnd) on TOP of this this kind of pcb?
When i design a PCB i put always a powerplan.
thanks
Yeah, it's just good belt'n'braces engineering.
Hey, the vid's just up, nice!
Dave, have you ever started a teardown you couldn't complete because you didn't have the correct type of screwdriver?
that white stuff is to stop vibration? is there a special name? i cant find it on google.
Kinda late to the party... it says 50 W max power consumption. What criteria made them choose an SMPS vs a linear supply? I would think a linear supply would have less EMI? Maybe i am just thinking about cheap SMPs.
Davo can a oscilloscope be used to measure skin conductivity like a polygraph?
soo.. was the heatsink-hooks solderd?
Noob question here: what is that white paste between the components ?
the 4 mysterious chips next to the analog input, could they be driving the Relays?
The only prices I've seen online for the DS2202 is almost 1600-1900 USD. Where can I get one for $800? :) Given that price range, does it still compare favorably with other offerings?
Ah, you wheedled it on last electronics exposition?
why would they intentionally limit the bandwidth?
The CAD software handles all of that.
how do you get these in aus/nz, id probably be interested in a DS1052E at its price point.
hmm dave I see alot of via stitching on boards and I know it has to do with some kind of RF shielding but what is it exactly?
EEVblog Dave, what do you think about the apparent lack of copper pour in the top layer?
How are the trace wiggles designed? Do they calculate it or do they try different layouts until they get it right? Or both?
what is stitching for?
Is the DS1052E still in the Rigol range, or has it been superceded? I bought the 1052E a few years ago and thought it was amazing value for money... just wondering what budget scopes people are buying nowadays.. or is the 1052E still the one to go for?
Thermal compound/grease.
Dave did you do this tare down to get your mind off the last "scope" you took apart?
Hello. Which oscilloscope would you recommend me to buy? Rigol DS2000 series or agilent dsox2000 series? Well, the price in dollars is almost the same! Thank you.
what is the use of the optocouplers?
Emona Instruments.
Ah yes, they were.
Sounds similar to BKGD pin of BDM interface of motorola a.k.a. freescale MCU's.
Just purchased an Agilent 3000 because of you videos. Hope you got some kind of kick back from them. JCNDIZO
What is the difference between the DSO2202 and the DSO2202A? Is 'A' just an updated version of firmware? The tech specs look the same to me, but there is a few hundred dollar price difference.
The A model can be upgraded further, so if you use the firmware hack it is well worth it.
wow lots of sheilding. i wamt one :)
Played with one of those before. I think it's a crappy one. I prefer something more expensive.
Well, sorry, but there was an error in my web browser.
thanks FeuerfaustGolDAce : )
...for Jousting sticks?? tell him he's dreaming!
then wouldn't it be fairly trivial to buy a cheaper one, and hack it to 200MHz?
So have Rigol forgiven you for taking their last scope apart and telling everyone how to upgrade it for free?
REVIEW !!
bkdg = background debug
tek DSA8300 series :P
search for Silastic
23:19 looks like some BDM header for 8bit Freescale .... just guessing
Chip markings look like they're lasered off - pathetic.
That Silastic looks like... Er, never mind.
Why an earth do Regol insist in burying the 2032 battery deep inside their products.
The user should not be expected to take the unit apart every few years just to change the battery. Why not fit an easy access battery compartment. Even better fit a super cap that does not need to be replaced.
The battery lasts for maybe 15 or 20 years, maybe even more.
+Ricardo Nunes Not sure where you get 15 to 20 years. In my experience on a desk top PC you get 4 or 6 years. The battery shelf life, defined by self discharge, might be 10 to 15 years, depending make, but the in circuit life can be much shorter. The battery is rated as 210mAh. The 32768 Hz crystal is the HC 32 type, rated at a maximum of 1uW drive power. Working with a 3uW circuit current power, gives a calculated 8 years in circuit life, but what ever the shelf life, it seems bad practice to make the battery difficult to access by the user. Mounting it on the PCB means that a battery leak will most likely damage the PCB tracks before the user notices the battery needs to be replaced.
In my case, the RTC, fitted in my DSA800 Rigol Spectrum Analyzer,, failed after just one year. This turned out to be due to a faulty HC32 crystal, which was replaced under warranty. The question is, did the crystal fail because it was over or under driven? The Pierce oscillator capacitors are not fitted on my version of the PCB, so the crystal load and precise oscillator frequency is defined by the stray capacitance of the PCB tracks and the IC input.
+Nigel Johnson I am not sure if I agree with you. The jellybean DS1307 datasheet says that you can expect a 48 mAh battery to last for at least 10 years. A 210 mAh would probably last for the whole scope's life.
+Ricardo Nunes The in circuit battery life is determined by the circuit load, so I do not think it's possible to use a figure based on just the battery type. The assumption would be that the self discharge life is the dominant factor. In the dsa800 analyser, a small six pin RTC IC is used, but the part number is not visible, so I cannot check the supply current, I must admit I guessed at 1uA as a typical figure. The short battery life in a PC maybe due to the ambient working temperature inside the case. Again my point is why mount the battery on the PCB when it is so easy to mount it under an easy access cover. Unlike most electronics, the working life of lab test equipment can be very long, so it makes sense to make the battery accessible to the user, particularly where calibration may be affected by removing the RF screens. As an aside, I object to the amount of electronic scrapped generated simply because of the built in obsolescence of sealed in for life batteries, as in the latest generation of laptops and tablets.
+Nigel Johnson I understand what you mean, but there is no need to put the coin cell easier accessible if it will last for the whole product life time. The self discharge in those batteries is not very important at normal temperatures. If the RTC consumes 1 uA (I personally believe it is less) and the battery has 210 mAh of capacity, you can expect the battery to last for more than 20 years, and the numbers used in this calculation are conservative.
Not a good idea on components that can get hot.... ;->
Second !!!