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- เผยแพร่เมื่อ 28 ก.ย. 2024
- Is this FNIRSI-5012H 100MHz bandwidth 500MS/s Handheld pocket oscilloscope any good?
Review + Teardown
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We bought something similar to this for the workshop; especially useful for checking ABS sensors. It's easy to use, even for the Aussie apprentice. Single shot, spin the wheel and you can instantly tell whether it's the sensor or chipped or broken tone ring. Brilliant; paid for itself within the month. Also if it's run over, no great expense. If only people would remember to recharge it AND put it back.
agreed !
This is the 4th under $200 hand held ("small") scope I have purchased, and for my work under 30 to 40 MHz, it does a nice job. If you do the obligatory "divide by 3" on the specs for the Chinese claims, it works well within the "calculated" specs. In other words, for an old Ham (as in in Geezer over 70) doing simple work on HF gear (2 to 30 MHz) it's the cat's meow.
That was measured in Chinese Mhz. Very similar to Chinese watts on amplifiers.
Don't forget Chinese mAh.
Or chinese power savers
@@chupamishuevos303 Or chinese electrolyte caps without the juice 😂
How do you convert normal MHz to chinese MHz???
or Chinese Welding Irons
I am shocked that something on Alibaba does not meet specs.
I'm surprised a well respected internet expert doesn't have clue what he's talking about sometimes.
Maybe not.
I can think of a some good uses for this device despite its limitations. The biggest one is for field use by clumsy people who can't be trusted not to break the Fluke scopemeter but that still need an oscilloscope. This also could include classroom use, where people tend to do stupid things. In both cases the required bandwidth would probably be well below 10MHz for basic measurements. Another place this would be potentially useful would be when working with things like motor drive systems, where an ungrounded oscilloscope is required, though I don't know if I trust their statements on the voltages it can withstand. That being said, second-hand equipment from a known good brand may be a better choice.
I use it to look at analogue synth circuits and their behaviour. That envelopes, filters, PWM work like they should. Only visually though. Operating on up to 20 khz range audio range strictly. It does its job fine for that.
To be fair, if it can't handle audio frequency work... XD
Given the nature of what an oscilloscope actually is, any modern PC innately can implement a scope entirely in software through the audio hardware.
since that's typically 192khz ADC with in some cases 32 bit sampling and an inordinate amount of sample memory, it's a pretty interesting improvised method for low frequency work.
For similar reasons a mobile phone (if it still has analogue inputs) might be coaxed into doing similar tasks...
Of course, the reliability of this would depend on the frequency response, and there's stricter voltage limitations (probably requires external circuitry to protect the audio inputs)
But at the end of the day... For low enough frequencies... XD
Basically, you are saying this is a toy for children. At least you are honest in your assessment. The marketers are outright liars.
I am an engineering student from South Africa where regular labs and open labs are usually pretty packed so you dont get a lot of time to spend with a oscilloscope so i bought a dso150 shell oscilloscope for around 20$ to do some experiments at home. While the measurements are more often than not wrong it still helps prepare you for the real thing and gives you a bit of a confidence boost when it comes to labs. it also gives you a fun little side project to mod as i added a battery and custom firmware to mine. it also gives you a chance to play around with how an oscilloscope works without risking damaging a 3000$ one.
I love how you tear it down with the USB still connected and it powered on. :)
There's an easy hack to improve this. Just cross out the 100Mhz and write over it 20Mhz. Done!
Just scratch M and write G. There.
Might be best to just tip-ex out a 0, just to be safe.
@@JasperJanssen naw, man, just add a zero. Zero is zero, doesn't make a difference, right? The Wanhunglow way.
20 Mhz is enough for most Arduino projects. The highest frequency the Arduino (Uno / Nano / Pro mini) can output is 980 Hz, so even a 5 Mhz scope would be satisfactory.
@@dotancohen I have made Arduino uno make 4Mhz square wave so you can go higher...
The battery indicator shows near empty. I think you should charge this device into full and repeat your test. I want to see credible result.
I love Dave's video's, you can bump the play back speed up 2x and he is still fully intelligible, saves me a lot of time, Thanks for the excellent info Dave 👍
True, but it doubles the the frequency of Dave's already bird-like voice....(Tears off earphones in 10 milliseconds)
A pocket scope shootout video would be great. I'd love to see how the available pocket scopes, both premium and budget, stack up against each other.
And thanks for the very informative video on this pocket scope with the tear down explanation of the AFE problem designed into this one. (Not to mention the issues with getting 500Msps out of any ADC and into any uC!)
A good electronics tech always understands the limitations of their equpment
For the cheapie scopes that all seem exaggerate bandwidth (or conflate real or imagined sample rate with it), however, you get a lot more performance out of this one with its 2 to 5 times exaggeration versus the DSO211, DSO212, and DSO213 claiming 200 KHz, 1 MHz, and 15 MHz respectively with a similar exaggeration. And those cost from about $65 to $210. So, the 5012 is easily the best value (if you just must have one of the "mini" scopes) if bandwidth is important.
God I love this channel! "It can't even!! No! It can't even ....!"
I understand.
You need a girly magazine to help you do that.
Perfect scope at the right price for a kid learning the trade, I would have loved one.
It might not be a super high end frontend, but I do think it is very beautifully engineered with the price constraints. They gotta cut corners somewhere, and for the amount of components you get quite some performance. Outperforms a lot of (at the time very expensive) old scopes, quite amazing that you can get this for this price nowadays.
Anyway, I do think it would make a nice handy 'through in the toolbag' kind of scope to use in the field, or when working on things that cannot be transported easily into a lab (for example vehicles).
Love your channel, however I do have to say it's a $70 portable oscilloscope. At $70 I wouldn't expect it to be precise but might be useful for timing or checking for a digital signal. Could be nice to have in the tool bag.
Pffffsh, for 70eu I'd buy that with 10Mhz bandwidth easily, and be happy with that!
Have one of those super cheapy ones in the toolbox, just for those cases when you need to see if I2C look about right, or if it even there.
I have one of those DSO Shell clones as a toy and it sometimes comes in handy to do some quick measurement at a weird location where you don't want to lug the scope.
However, in my experience the big limitation in a lot of applications is that it does not have external trigger or 2-channel operation (where I could trigger from one channel and view the other).
This one does not have it either... apparently not a use case the developers of these gadgets envision.
A reasonably accurate display of a signal in the Khz or low Mhz range, I bet that is what most sane people would expect and need from a scope of this price.
I have one of these for repairing old computers, to see digital signals not higher than 50Mhz works quite well, when I need to see something really accurate then I use my old scope, but for saving space on the table is quite good. Also, mine doesn't has the coupling problem, maybe your unit is deffective, did you bought it on the FINSR store or in other one? I know they resell their "faulty" units to other stores and they sell it cheaper.
He says in the video he bought it from their official store.
But yeah, no QA process is perfect :)
is it good for repairing devices around 20mhz?
@@ivanbiasutti4567 For digital, sure, I get good signal readings up to 50Mhz (clock and bus transfers), for analog... not really sure as I haven't tested it, I only have an analog signal generator up to 10Mhz and with these it has no problem at all.
Dave rushes into things, it's a complicated quirky device that will take time to get friendly with, like women, horses and helicopters.
According to the specified input voltage levels you can probe mains voltages with this crap box and by looking the PCB it seems the USB connector is internally connected to the measuring circuits without required safety isolation.
It's easy to look down one's nose at a piece of kit like this in this day and age .. but I can see this as a relatively useful little gadget for simple breadboard play and debugging. Sure, not aligning an MRI machine, but even for "simple" service gigs .. is "this" particular output at least varying it's PWM signal? Would be a great auto service industry tool, the environment typically too harsh to risk the $1600 Fluke s'meter. Seventy bucks is a barely few hours worth of pints sorrow if you drop the little thing in a bucket of coolant. Not going to replace the 1GHz Tek mainframe, but I wouldn't be embarrassed to have one. Spent quite a few years with a "tool" fashioned from 5x7 LED matrices, LM3914's and 4017's as a rudimentary "scope" working on cars. I would say that this thing has it's place as an enhanced "go/no go" bit of test gear. Hell. remember what you paid for your first logic probe back in 1978??
Just ordered one
Why are you being too harsh on it?
It's a pocket scope and a cheap one too
For my uses it will be more than adequate
there is the model for an example: hantek 2C42/72 or 2D42/72..... its s scope, function generator and a multimeter all in one... --42 for 42mhz or --72 for 72mhz...
lol. Reminds me of an article from an electronics magazine about 20 years ago which gave a design for building an oscilloscope into a gameboy cartridge.
I guess that would be an amusing comparison - is this thing better, or worse than a hobbyist magazine project to turn a gameboy into an oscilloscope?
I know I have the design somewhere...
I wouldn't be surprised if that works better, simply because hobbyists are less concerned with meeting a price point, so it comes down to the design skills of whoever put that circuit together.
Of course, a Gameboy only has a 4 mhz z80 processor, but whether that's an issue or not depends on how the oscilloscope circuitry is designed and how it's interfacing with the gameboy...
Since the Gameboy just hands addressing to the cartridge, you could do some really stupid and powerful stuff. You could just make the Gameboy CPU run a simple thing that blits cart memory onto the display, and have a 1 GHz ARM SoC in the cart do all the heavy lifting.
AFAIK the game boy scope did not come close to meeting 20 MHz.
I have one of those cartridges..... fine for audio frequencies up to 100 KHz!
You should do a review on the Mini/Nano VNA
#SayNOtoKILO the Nano is an amazing piece of kit. I should upgrade the firmware on mine as I need measurements up to a gigahertz. The Mini looks interesting although the inventor has been griping about the Chinese knock-offs. The Tiny appears to be Unobtanium now.
i also have a nanovna for my Antennas, and i have to say: it's doing his job well. But would be nice to see a rev. by dave
No!
The prices might increase..
Dave, think for hobbyists also. Its ok for them.
Their English is better than my Chinese 😛
Indeed.
Are you designing a product for the Chinese market though? If not, it probably doesn't matter :P
TravelerInTime yes
TravelerInTime I’m a product designer, and work a lot with people in Shenzhen
@@InTimeTraveller
Don't bother, if it's any good they will put it on the market at a tenth of the price you are asking.
Within weeks.
Just gotta be aware of what it can and can't do. And for 70 bucks, what the heck. Still a nice portable pocket scope. I'd own one.
DJ can you do a follow-up on the whiteboard and draw a schema showing the resist divider front-end, the capacitance problems/origins, then maybe block out how the rest works? Like front end to divider, then ADC/micro etc? And maybe compare to "proper" front end? Im interested in how they went about designing it at a low cost, but came a gutsa with certain decisions.
That might make an interesting video.
@@EEVblog yeah - its great when you break out the board and go into a bit more detail with some of these things. And voltage division/ratios through resistors is a base concept, so may be a nice hook for beginners to get into & understand. And to hear from you why, even though the division works, it didnt cut the mustard here freq wise. And maybe why this thing could never get it's advertised "banner" specs because of hardware/silicon choice? Cheers mate - love ya work.
It's possible that the chip may be capturing the samples via DMA to the GPIO. I haven't looked at the frequency / signal spec of the GPIO for the chip, but the block diagram has the DMAC, SRAM, and GPIO on the same AHB bus which can run at 168 MHz. It also has two DMACs. The details of the matrix didn't appear to be in the datasheet (it may be a multi-lane cross bar), but it is probably 32-bits and one full bus at least. That means that a single GPIO DMA transfer could occur at 168 MHz, reading all 32-bits simultaneously (16-bits of sample data and 16-bits of garbage). And since the two 8-bit samples are contiguous in time, it doesn't have to do any weird repacking. I would be more interested in how they are doing the triggering, especially since it looks like the clocks are from DMA transfers?
iv seen others reviewing this meter & none of them put it through it's pace's like you did. I was going to get one but iv changed my mind now.. so thank you Dave for opening my eyes to the obvious flaws of this scope IF THEY UPGRADE THE SOFTWARE ILL CONSIDER BUYING UNTIL THEN ILL HOLD OUT FOR SOMETHING BETTER.. but then again if this models price drops "A LOT" ill get one!! but until then i wont be holding my breath.....
I got one of these to play with as I am reviewing a number of low cost scopes to advise others for model railroad purposes. (Testing most of the DSOxxx tiny ones and larger Hantek ones like their 2C42 which I think is money MUCH better spent than for any of the "mini" scopes.) The one I got was marketed by Yeapook as the ADS5012H and seems identical. It is a somewhat different animal than the DSOxxx scopes which have ludicrously exaggerated bandwidth claims. The 5012 peak to peak voltage diminishes quite a bit once you get above 20 MHz, but it can still show a semi respectable sine wave to well above 50 MHz (although slightly flat topping above that). Of course, a square wave at those frequencies looks extremely trapezoidal. I found one of the most interesting features being that a button is provided for pretty much each of the day to day operations you do. Even a 1X/10X button is there which is something buried in a menu on every other scope I have seen. By far the easiest scope for a beginner to use. It comes with a 1X/10X probe but like most cheap probes with cheap scopes, it introduces voltage error and has no means for compensation. You need to use a 10X probe for max bandwidth so if accuracy is important, you may have to buy a scope probe that costs as much as the scope. I must say that after flailing at a number of the other mini-scopes and figuring out the trick(s) to access all the menu choices, this 5012 scope was like a breath of fresh air. It even came with a very nice semi hard shell case with room for accessories. Finally, the case has the slogan "A hardy tool makes a hardman". On the Amazon site, the slogan is "A Handy Tool Makes a Handyman".
Mini series of cheap aliexpress handheld oscilloscopes reviews anyone?
Half of them are the same guts, different casing.
@@tin2001 - Are you talking about girls or oscilloscopes?
@@thekaiser4333 oscilloscopes..
It just reminds me the DSO138, a $10 oscilloscope with a STM32 directly sampling the input signal with its ADC lol.
I was gonna buy this but hesitated.. Thanks of good review showing problems which makes it useless for me. Thanks again!
Is the $70 price point reasonable for a 20MHz portable oscilloscope? If FNIRSI were selling this _as_ a 20MHz scope, and not trying to pass it off as something more capable than it is, would it be worth it?
Thanks for the review, I was looking into buying one but probably won't after watching this. It's a shame because as you mentioned there is a lot of untapped potential in this product. If the analog front end could be made more robust and if it came with better firmware, it would make a great scope in this price range. 20-40Mhz would be good enough for most hobby electronics use so I don't think that's a problem.
This pocket scope is great.
This might be a fun starting point for a project.
Seems fine for some low key automotive applications?
Nicholas Anderson I was thinking the same thing but still watching this video. Had a 04 Camry with weird Transmissons issues, put a $40 pull a part ecu in it and it fixed it. I would have liked to view the solenoid duty cycle waveform to properly diagnose it.
@@dorhocyn3 seems like the perfect application for something like this
That's what I'm using my DSO138 for. A 36 tooth timing wheel at 10,000rpm is only 6K Hz, and the DSO138 is fine to 10K. Maybe even 20K. It's nicer than my DSO130, but it's also costs a 4x more, so it's probably too expensive. I'm starting to get into injectors, so it would be better for me to have a 2ch so I can see the INJ opening and closing at the same time to work out my dead time.
I think something like a cheap USB scope ala Hantek would be better since you have deep sample memory. For example, hook up to the camshaft sensor, start recording, then go and crank the car over, then come back and stop the sampling and examine the results. I know you can do this with triggering but just a straight datalogging adds validation. Or checking out a suspect wheel speed sensor: hook it up, go for a drive, when you see something funny pull over and have a look. If you really want to get dee p into it you can import into sigrok for looking at CAN for example.
@@paulmoir4452 USB scopes are a bit of a pain IME, having to balance a laptop and a fairly bulky interface within the engine bay, with a running engine is not easy.
If they hadn't made the claims beyond what they really did, it would be not a bad deal. The analog scaling could be a lot better without a lot more complexity. It would likely involve some 2% capacitors to get the gain flat enough to be an honest 3db at 20MHz.
I have a DSO 068, at first I didn't like it much, but as the time goes by I getting to like it more and more (battery powered, don't need to worry about ground loop, etc.). The biggest advantage it has human inerface, I don't care if a scope has 10Gs/s if I can't use it effectively because it has no knobs just buttons, or even worse only touch interface.
Whats your opinion on the DS212? I would like to see you review that.
The fist clue is the retail pricing... Thanks for sharing this evaluation. Great work. Cheers, #SeattleRingHunter
In this case, the 50 ohm load is not necessary, because you are not measuring a power, so 50 ohm of the generator, with the 50 ohm load in parallel, is 25 ohm, 25/50, it is 0.5, 0, 5 times 0, 7 equals 0.35, exactly what you read on the final, I would say it keeps expectations !!!
Do a review on hantek 2d42/72, it's a swiss tool DMM
It's not. Sent it back when it turns out ohm is kind of random and unreliable. Over all at measuring it's sluggish
Yup, just heard your last comment. I'll check it out.
Very good from India 👌
It doesn't get smarter under the Brightness menu?!
ba dum tish ... what a joke -_-
Of course this microcontroller can drive the ADC through timers or pwm or a similar interface at 100MHz. You don't drive it manually raising a gpio pin from the code anyway. Then ADC can store the whole captured buffer through DMA into the MCU memory which then process it later.
Do a cheap oscilloscope comparison video
I'm interested in a 4 channel scope and wonder if the siglent sds1104x-e worth the extra 130€
I'm sure the mfgr appreciates your debugging their product. I'll wait for the revision where these issues are fixed...
Would this be useful for tuning a car amplifier?
How about checking sensors on semis and refrigerated trailers or other automotive uses?
Its voltage values output are wildly off, so I'd say no..
Patrick Dorion So I would gather amplifier possibly, mechanic work, probably not.
For the amplifier it would be mainly to verify the audio is not clipping.
Not sure I would want to spend that much for that single use case.
@@caddyguy5369 Audio is 20 kHz max, there's the DSO Shell for about $30 that might do it for you, I think... It used to be a contender for my hobby electronics use, but again, at 1/10th the price of an actual oscilloscope and only 3 MHz (if I recall), it wasn't worth it for me, but just to see an audio waveform it might do the job (if it can handle enough voltage, can't remember anymore)...
Liumy LM2001 is a better option
RuiDeng RD6006W would be a good candidate for review
Ooh, hadn't seen that. Yeah.
If it showed an accurate voltage 20MHz would be fine for the price for me.
17:20 your battery scope it s almost empty , may that cause some meansuring problems ??
Plenty of good work has been done using 10Mhz scopes throughout electronic history. China engineers should put less effort into making the fastest pocket scope and more into making the most usable pocket scope, a true 10 or 20MHz scope, mobile-tablet size with all the usual functions and an actually good usable interface (DSO Quad/Nano/203/whatever ... argh, I hate the thing just for the stupid interface confusion!) for $100-150... it seems like it should be possible.
switch in the st chip and see if it is better.
These things would have been so much more populair if we could add our own software to it.
Then we could fix a lot of these shortcomings.
I am a Chinese, to be honest just dont buy this type device. Save money and buy a brand one, at least rigol siglent even uni-t or owon
Depends what you need it for. I have a Siglent SDS 1104X-E, and to me it's a pricy hi end equipment. I wouldn't feel comfortable using it in a field where something may happen to it mechanically, or some unknown signal may fry it. The $70 scope would be PERFECT for such use.
I’m a mechanic spent thousands of bucks buying pico. It’s an overkill to me , portable and cheap device like this is what most of us need. Hope fluke might come up with device like this.
Have you seen the network analyser for under
$100 ?
I can't afford thousands for a nice one.
@@lasithrajamanthri5992
I bought a Tek 485 for 50 GBP on Ebay.
显着你了是吧，妄自菲薄。
EEVblog - Make a hack to make this scope perfect.
A reskin of the original pocket DSO which was 20MHz. This is like old webcams that upresed feed 2-4x.
Can someone explain what does "come a gutta" mean?
en.wiktionary.org/wiki/come_a_gutser
@@RFC3514 Thanks, now I know why my google search didn't come up with a meaningful result :)
Means make a bad mistake, or have an accident.
It looked a bit like those kit oscilloscopes you can build. so I looked at their other ones. And yeah, they started with making those kit ones, and then I guess improving the analog circuitry and the software. But it doesn't seem a lot better, but it's a lot more expensive.
The measurement is not correct, because the fnirsi does not have the correction for the 50 ohm , the keysigh instead yes !!! note that the waveform is not distorted, so the passband is good, consider that any oscilloscope, has the passband at -3dB, so a signal of 100mhz, 1v pp, measure it 0.7v pp, missing the correction 50 ohm measures 0.3v pp !!!
Just my two cents, but I ordered one when they came out in July. However, I just
got around to using it. The micro-USB connector is recessed to far to get any juice.
Had to take apart the case, and file the opening larger. It was the DANIU ADS5012H,
from Banggood, but same unit as you review, I believe.
Its an old unit that came in another version previously...
I saw them on clearence sale at Banggood in June at 79 SD was priceredcuted from like +100USD and I purchased one, but cancelled it again, before it was shipped and then saw a month later, in my mail that it was on sale with coupon at like 55 to 58USD and concluded well that i didn't purchased it now that it was even less and wondered about purchasing it again..
but it was not the same, a new unit with changes.
ON BG productpage even today..
"In order to save costs, the material of screen has changed to TFT from IPS. And the battery capacity has also reduced to 3000mAh.
So.....Just made A few minor changes, the price has gone down a lot!!!
-2019.6.24 DANIU Team"
-- so the first unit was with way better IPS screen plus some other differences..
but at the end of the day, if people have a use for it. then it is fine little mobile scope meter.. afterall the threes doesn't grow into the sky with those specs.
the only meter I got from FNIRSI is this imgur.com/a/nOiUeAa
Is it harder to blow this up than a normal scope? Is it bad to be in the wrong volt range with like 30+ volts?
Very nice circut board though, my OCD approves it to large extent! :)
If it had been advertised as 20MHz, would it have gotten a pass? Even for the asking price?
Why did you not read the manual tho? It clearly states that you need to be in 10x mode to read anything above 5Mhz.. Look at the page to the right when he starts to read the manual in the beginning of the video. Clearly states you need to set it to 10x mode.
I seen a video on yt yesterday, someone analyzing the output of two consumer portable ac generators. He used a pocket scope also. But his was so bad it could not even display a usable 60 cps ac waveform. And so, completely useless for anything. I have experience using REAL bench scopes. I have seen these pocket scopes in catalogs and websites for ages, but never encountered one in real. I always assumed they were functional and usable, just highly limited. But with yesterdays video, and this video, I am thinking that one should always and completely avoid purchasing or using them. Yours is far better than the one I seen yesterday. You cover the specs and look inside and review. We find out that the MFR totally LIES about the specs and capabilities! This alone makes the point to avoid this and similar products. Thanks for the great video. I was considering getting a pocket scope for a while, but that has changed to "Not Even Going To Consider It Again!"
Can it be this channel has not tested any of the more decent and perhaps also honer labeled cheap pocket scopes??
What's the take on Miniware DS line.. like the DS212 it seems to be around the same price as this 70ish.USD? with an STM32 chip
Thanks for making these kind of videos !! This type of videos made me subscribe EEvblog 6 ago but you resent videos didn't had that old glory ( solar roadway and other scams 😕😟 ) looking forward to this kind of videos
*sigh* I've been making debunking videos since the early garage days. I've always made more than dozen different types of videos, you don't have to like them all and that's ok, don't watch them.
So you compare a handheld pocket 70 USD oscilloscope with a 3.22kg, 1600+ USD desk oscilloscope and wonder why the keysight is better?! Biased much? Just add some EM shields in the 5012H and check again...
Was it $7 before it jump to $70?
for $100 the hantek 2c42 is much better value
you can change the trigger point. You have to disable the 50% on the menu
I do that, watch the video :->
@@EEVblog yes I saw that after a few minutes. Great use for this would be smps trouble shooting. What do you think? Great video. I just received this scope to tinker with smps diagnostics. I have a siglent sds2202x but I need to use an isolation transformer either on it or the power supplies I am working with. Thanks again.
If they had claimed the true performance, and didn't have the massive capacitance shift between ranges, I would like it. That sneaky-business is not cool.
A real one would cost you 5 grand, put up with the quirks.
You can buy a network analyzer for 25 bucks, post free.
Take my money.
The very first question should be: if 8-bit 1GSPS ADC costs ~$100, and 500MSPS ~$75, how can they sell the complete devices at $70?
At least this thing _looks_ more impressive than the Radio Shack "ProbeScope" pen oscilloscope from the #860 Mailbag. (Though to be fair, this $70 scope may taste better than the NECCO wafers that were in the box with the ProbeScope. 😉)
If it's not going to be accurate, you may as well buy one of the super cheap $20 ones. They have a rotary encoder that makes them a lot easier to use, and you don't feel robbed because it was $20. You'll need to hack in a lipo battery, but that's not rocket science.
119 dislikes came from the manufacturer
wanted to see if it would handle 240v ac 50hz but what i seen he tested it up to 20 odd mhz id never use a portable one this high anyways
Can you recommend something better, may be more expensive, but better and still mobile ? Which i could take with me ...
Can i test ac maim 220v directly by this device
If not what i have to use or to do to do that???
Thank you
Ok well sucks they bullshitted the upper end of the bandwidth but I mean...70 bucks, and consider where it's made. For audio frequency, quick probe, see if a signal exists...etc. It'd be just fine. Comparing that thing against a 1500 dollar benchtop scope well OF COURSE that'll blow that 70 dollar thing out of the water. Kinda apples to oranges there man.
"How you doin" haha love you Aussies!
would some of the anomalies be due to some kind of phase issue within the device caused by sync problems? comb filtering etc? (if part of the process involves inversion of the signal?) just curious. I'm no expert. if something like that "wiggly" length matching arrangement wasn't spot on....
Do you think this work work reading waves in the automotive world? I could see this being handy
it might be ok for audio rate waveforms
For a Basic Starter $75 Now a Bad Unit, Now My first Unit, is this DuMont 214 at 75 stones,(Crick) Ouch my back.
The GD32F407 is likely a cheap-arse clone of the ST Micro STM32F407.
Yes, it is actually a one to one replacement. I think there is only one minor difference and that is it. I suggested switching it for the original and seeing if it makes it better.
Much cheaper. On the order of (pennies? Whatever 1/100 is) Of yuan so less than a penny per. That's why it's used.
Edit: actually, now that I think more carefully it might not be _quite_ that cheap, but it's definitely less than 1 usd equivalent in china. So, compare that to stm32, which might cost $2 per in bulk and you can imagine why it's popular
@@sheepsfeather3159 Cheapest I found it in china was $2.50 USD. I don't think you will see it for much less than that. The STM32 version is about $3.00. GD are fairly reputable and basically offer a slightly cheaper second source option. There are actually cheaper clone companies out there. GD outbid cypress semi, to give an idea of their size.
@Tzuede Off the Cuff The GD32F4 part does include an FPU but it has nothing to do with the issues found. The sample handling will all be integer anyway, but the problem is the sampling and triggering is all handled by firmware rather than e.g. logic in an FPGA, and the micro simply isn't fast enough to do everything at the sample rate they are trying to run at. That said the Giga Device micro is actually quite a bit faster than the equivalent STM32 part.
If you're using a CPU to do sampling then there has to be a program behind it.
You'd have to be really optimistic to think the CPU can sample at it's clock speed;
Leaving aside more specific limitations with various IO pins...
To sample at the core clock speed requires that the entire read/write cycle and any memory addressing logic can be completed in a single cycle. That's really unlikely even if the CPU instruction set is single cycle per operation.
To take a CPU I'm more familiar with (but which is very old - though you can still buy them new)
If you were using a 65816 to do this...
Reading an 8 bit value from a memory location takes 4 cycles.
Writing it out again requires another 4 cycles.
That's absolute best case scenario (bulk move is a thing but not applicable to a case like this)
If any addresses need to be calculated you can easily add 20 cycles to that...
That means best case you're doing about 8 cycles per sample read, worst case you're doing nearly 30.
So if you were to use such a CPU for this, you'd need anything from 800 mhz to 3 gigahertz to read a 100 mhz signal (at one sample per cycle, which is nowhere near good enough for these purposes)
So, you have a cpu that does instructions in single cycles? Good for you.
Now you're doing it in 2-5 cycles.
Still you need a 200-500 mhz CPU to read a 100 mhz signal.
And actually you need a 1-5 gigahertz CPU (and no, multicore doesn't help you with this owing to the nature of what you're doing) to meet 5 samples per cycle...
So yeah, doing this entirely using a CPU is not a great idea;
Your best case for 168 mhz CPU is something like 84 mhz, but even that is hopelessly optimistic, and something in the region of 32 mhz or even considerably less is more likely.
But... Can the hardware with an optimized software be a decent 20 mhz oscilloscope?
can you measure mains earth referenced circuits with this ?
So DSO 138 do the same for way less
I don't know, this would still be good enough for field work, for me at least. I'd only be using it for looking at Dallas One Wire and RS485.
Is there anything similarly priced at
Finally had to look up what "come a gutser" means. It's basically a #fail on an 0wned/pwned level. Now I can stop scratching my head every time I hear it.
it means you fucked up