I think I know what's going on when Paul is measuring the 100MHz oscillator. He says the wave is fine, but if I measure the period of the waveform the old fashioned way (using the graticule), it looks to be little more than 3 major divisions - I estimate 3.2. It looks like the time base is set to 20uS per division, which gives a period of about 64uS or a frequency of about 15.6KHz, which is consistent with the frequency the scope is measuring. This is WAY OFF from the supposed 100MHz frequency of the oscillator, which should oscillate about 100 times in 1uS or 2000 times in one 20uS division. Either the oscillator is FUBAR or what's being displayed is a classic case of aliasing - I choose aliasing. This is a good example of why NOT to trust the setup that happens when you hit the Auto button. Later, when he measured the 100MHz oscillator again, he had the time base set all the way down to 10nS, which I think is its minimum, if it's the same as my FNIRSI 1013D. Then the period of each sine wave is about 1 major division or 10nS, which matches the 100MHz frequency. (It actually looks a bit slower than that but not down to the 80ish MHz the scope is displaying. However, I would take this particular display with a grain (or bucket) of salt. If the scope's actual max sampling rate is 200M Sa/S, it's only taking 2 samples every 10nS, which is right at the Nyquist rate. It's hard to recreate a periodic signal with only 2 samples per period. Couple this with a low pass filter with a 3dB point of 20-30MHz, as Paul and Kangaroo Dave estimated for the FNIRSI 1013D, and I'd have to say that this scope is doing a fair job of recreating a 100MHz signal. By the way, Paul (by either genius, experience, or dumb luck) demonstrated an important debugging technique and was just to darn modest to brag about it. When he didn't get what he expected the first time he measured the 100MHz oscillator, he measured some other things, then measured the 100MHz again and got a DIFFERENT result. It's amazing how often that happens! I tried to watch EVERY scope review video Paul has done this weekend (and have the red eyes to prove it - 22 different scopes!), and in one video, he put the scope into a mode where it only displays the various samples as unconnected dots. (I really wish I had noted which video this was in - if anyone remembers, please let me know.) It seems like that display mode would give a good method to determine the scope's sampling rate. Put the scope in the shortest time base available with only one channel turned on, sample any waveform using single shot, then measure the time between dots (or dots per unit of time). From this you could calculate (at least approximately) the scope's sampling rate. Has anyone done this? In Dave's teardown of the FNIRSI 1013D, he guessed which chips were the A/D converters and probed them to determine that they were sampling at 200MHz per channel (actually 100MHz per A/D, but there are two A/Ds per chip). I'm guessing the A/D converters are the two chips to the left of the big one in Paul's teardown. Any chance you could probe them like Dave did, Paul? (Don't probe them with this scope, use your Rigol or MicSig.)

A 100 MHz pure sinusoidal wave should be used for the test. A 100 MHz square wave will require a quite higher sampling rate to get enough samples to have a good interpolation. This is because a perfect square wave is made of summation of the whole series of odd harmonics.

@RSP13

2 жыл бұрын

Not really. If the scope actually had 1 GSa/s (as advertised) it would have 10 samples to draw 1 cycle of the square wave, which is just enough to convey its basic form. This is the reason why scopes should have sampling rates at least 10x greater than the advertised maximum bandwidth. PS.: This scope probably has 200MSa/s since it uses the same chip as the 1013D but with two 100MSa/s vias combined at each channel. Also I doubt that this protoboard and alligator clips are a viable setup for a 100Mhz signal.

Man your depth of knowledge is amazing. Thanks so very much for inspiring me to learn more.

Thanks for these reviews, I went ahead and ordered one as I need to calibrate some oscillators for my modular synth :)

Cool video Paul. I think the problem is sampling rate, not analog bandwidth. The sign of analog bandwidth would be the 3 dB point where amplitude drops as you know. But when the waveform is misinterpreted as this was doing - it is a sign of not enough samples to connect the dots properly. For instance, when you changed from 50 ns/div to 10 ns/div, it showed the right waveform as now you are collecting 5x less samples. Then when you went to higher freq - it again gave the wrong waveform. At about 2 min in and you said the wave was shown right but the freq counter was off, well the freq counter was showing what the displayed wave was showing, so the waveform was not correct. I’d say it is more like 10 MHz, or maybe 20 MHz if you only show a few cycle. What that shows is that it is likely an issue with sampling rate and not enough memory to capture enough data points even at 28 MHz, unless you are OK with just a few cycles one the screen. IMHO;)

@stevenbliss989

2 жыл бұрын

It's much worse, ...this is a FAKE BY DESIGN POS crap scope!!!!!!!!!!!!

Thanks for this review. I am a tube amp builder and need a scope for chasing down bad components and oscilations. I have little to no idea how to use these things at the moment, lol, so I find these videos invaluable. Hopefully, this thing is adequate for my needs

I have been waiting for this video!

1) Never trust “auto set” function. The software makes assumptions based on what is read through the ADC. Always crank the time-based knob to get a “second opinion”. 2) Aliasing is a common problem with digital oscilloscopes. The display and readouts will show a lower frequency signal with a misrepresented waveform. This is more so, when “auto set” is used. 3) To a certain point, “auto set” is like the “autoroute” functions on PCB CAD software: they are ironically NOT for beginners.

i litterally just saw this scope and u just made a video abour it! brillant!

Are You sure your breadboard is capable of handling 100MHz frequencies? Why not try with a proper signal gen, and see if You get the same issues there?

@frankowalker4662

3 жыл бұрын

I had the same thought.

FFT seems to be working as you can see the harmonics of the semi-square wave. I would try the demonstration using manual mode, not auto setup. Great scope for portable use though.

The price isn't too bad for an okay scope. I'm not surprised the price went up they sent them out to everyone with an electronics channel to review. A lot of free advertising there. 😁 Thanks for the video!

@ajlenze8

3 жыл бұрын

If all the electronics channels are getting this scope, where are all the reviews? I've only seen reviews on TechCornerTV and here (and a couple of non-English channels).

As I wrote in part 1: of course you can calibrate the probe in the BNC connector of the signal generator. But do you really have to save money where possible? But then the question remains, what else can I expect from the device. I think you saw that here. For not much more money you can get a hantek dso2c10 or an owon SDS1102. These are only beginner-devices too, but at least they are usable.

Well i got one recently turn out to decenty better then my first dso150 and the hanteck 6022bl I have Thank for the teardown

On one of the 4 star reviews to the rebrand version of this scope, on Amazon I think, they mentioned that a "firmware upgrade to this scope" could be used to flash the memory of the rebrand version and bring it up to the 100MHz range (someone else also saw the shortfall apparently). Maybe a simple firmware update is all that is needed here to bring this scope to advertised specs?

The fact that the 100 mhz oscillator appears as a sine wave instead of a square wave is a sign that it's UNDER SAMPLING and not meeting the Nyquist critera.

Thanks for sharing!

Great videos! With this scope floating on the USB power, does that mean that I can take reading of the old vintage hot chassis found in the AA5 radios? Thanks for this fantastic series.

@learnelectronics

5 ай бұрын

Yes it will

My first 2 thoughts - is the breadboard capable of giving a RELIABLE 100MHz signal, i recommend using a SIG GEN instead - You're using AUTO quite a bit, i wouldn't trust AUTO settings, i recommend adjusting manually - i also don't think the problem is so much so analog bandwidth as it would be Memory Depth or Sampling Rate

It would be cool to see if anything can read that micro sd and see what is on it. Also, curious what happens if you try to run it with the sd removed. Sucks about the no 100mhz, but it's still pretty great.

I've seen some specs on this one that says it has external trigger... but I don't see any connections for such...? That's one thing I really miss on my "table" 1013d model. At least I have a real 'scope for when I really need it... but these little ones are so dang handy!

Don't you think that the trace line shows slightly disturbance, the disturbance also appeared on the wave form of the signal?

So it's actually 20 Mhz scope.

I would be interested to know if I can connect a lipo battery with 3 or 4 cells. On the back it says 1-40 V input and I suspect that the voltage converter is under the long sheet metal cover. I have a lot of lipo batteries with 3 cells and 5 A from the model construction area, so the device can be operated for a very long time. Unfortunately, I couldn't find any information about the power requirement and, as I've already read plug-in power supplies can produce sparks in the image. It would be very advantageous if I could simply install a battery ( inside ) without using additional Stepdouwn controllers what would be stupid if a downstream step-up pushes it up again.

So I plugged in a small blue tooth speaker into the first channel of mine and it got up to around 25v peak to peak. The problem is that I increased the volume same voltage just dropped to the bottom of the screen (it broke). So I assumed that I blew a fuse, another problem is that there are no fuses as I can see. How do I fix this? Can I fix this? Also I noticed that the power cable that it came with doesn’t work any more, but I have an elegoo 9v 1000mA power cable and it works with that, but before I turn it on the screen turns white then it turns normal for a bit while it’s on, but when I click auto the screen freeze on what it was on.

Was Very VERY impressed with this scope on your other video ; ) so let's watch & see if its get's better!!... (BE BACK AT THE END) ; ) O.K. She's not a 100MHZ scope(which is disappointing) But On The Bright Side, You Did Pick up The 2nd Half Of The Famous S.E.T.I. "WOW" SIGNAL.

Thanks for your videos!!! Is there any way a 1kHz Sine Wave signal from the Generator function be reduced to about .5v peak to peak for purposes of testing a stereo audio amplifier? Sure would be useful being able to do that.

Hello Paul thks for the Video. I dont find on the generator nothing no fix the outputlevel of the generator? may you can gave me a tip how i can regulate the outputlevel? Thks for answering?

"I have many more, don't worry" This made me watch the entire video.

I ordered one of these scopes,now i find there are issues with pk-k voltage being off and by a fair amount that a firmware upgrade does not fix,did you compare this scope to a known signal source pk-pk voltage?. Also it has a min Vin sensitivity of 50mV(when or if it actually measures correctly),of course sponsored vids will make claims of perfection,but you expect that. I don't intend to measure over 100Khz as i want the scope for audio,i know 20Hz-20Khz but the amplifier will still amplify higher Hz than audible range. Appreciate the effort to show these entry level tools.

From its manual, "The bandwidth of the 1X probe is 5Mhz, the bandwidth of the 10X probe is 100Mhz. When measuring frequencies above 5Mhz the switch on the probe needs to be set at 10X, and the scope needs to be set to 10X. Are you using the correct probe?

If you crank up vertical sensitivity. mV/div, maybe the counter will work correctly. Please input 100 MHz and see if it displays amplitude at least.707 of true value.

What the difference between oscilloscopes 1013D and 1014D? And who is better?

Interesting how most of the reviews for the FNIRSI 1914D Oscilloscope were done about a year ago. FNIRSI must have sent a bunch out to the youtube content creators tjem. I seen several review though from about a year ago that test the scope and proved it does not work will past 30 MHz. If you need a scope that is useful beyond 30 MHz, keep looking. Can't believe the get away with false advertisement.

Thanks man

Do you know if there is a way to make sure the firmware is up to date? I can't seem to find it

Try it again with the 100MHz oscillator at full clockwise on the sweep rate knob. This is a SAMPLING scope, so it's not going to work exactly like an analog scope. When you set the sweep rate too slow, you're looking at the beat frequency between the sample rate and the actual waveform. For 110MHz, you need to max out the sweep rate.

Can you please show us at what range of timebase you get the roll function on the screen?

Great video, does this come with a set of probes,?

Well I own the Loto and this scope. I gotta say I like both of them. The FFT on the LOTO is better but all in all both were good buys.

i was gona get the hantek but i like the idea of using my ryobi 18 volt inverter to usb to keep it mains free. If i use an isolation transformer is thare a limit of the voltage it will handle?

Does anyone know where ICAN get a replacement screen for my FnIRSI 1014 D oscilloscope. Managed to crack the screen, doh!

MR:PAUL THERE IS ANOTHER PROBLEM WITH ANOTHER MORE 1014D++ ABOUT DISPLAY ALL SCREEN AFTER UPDATE V3.0 GO.S 10mm RIGHT AND 5mm DOWN AND IS NOT POSIBLE TO READ THE SIMBOLS FROM KHZ+MHZ I PROBT ANOTHER UPDATE BUT THE DISPLAY STAY WRONG TO THE RIGHT SIDE!!!IF YOU HAVE ANY IDEA TELL ME PLEASE THANK YOU!!DORTMUND GERMANY!

Hi, is it possible to measure the wave of 100 Mhz via cursor to get data? you didn't try that, It wouldn't surprise me if the reading of the frequency by the sparks produced by the power supply failed. The plug-in power supplies probably have bigger problems as i have see in KZread.

There’s also an ADS1014D. I wonder what the difference is.

I think that micro SD card contain the oscilloscope OS/firmware or something like that, if I'm right you have to backup the data inside that micro SD card to your PC right now :)

Mine seems to go wonky above about 40mhz. Still a good scope for the price.

Why do you use "open" input? Try to use it with 50ohms..its HF ... Greatings from germany

What kind of screwdriver was used for disassembly? Disassembly is not possible. I don't think it's a cross screwdriver, It would be appreciated if you could point out the type of screwdriver used when disassembling it.

Is there some problems, from device to device

At 100mhz it showed a perfect sine wave is that because of its interpolation?

@franktechniek

3 жыл бұрын

A perfect 100mhz square wave has endless harmonics of 200mhz, 400mhz, 800mhz, 1600mhz and so on. Since the bandwidth is limited to 100mhz (3db) it gets displayed as a (more or less) sinewave which is perfectly normal with any 100mhz scope. Also, the used canned oscillator does not output a true square wave, suffers from limited output bandwith as well. And the probe, the wires and what have you.

@ChupoCro

Жыл бұрын

No. It was because of aliasing. Check Nyquist theorem, Fourier analysis and similar.

@ChupoCro

Жыл бұрын

@@franktechniek Square wave consists of odd harmonics, not even.

@franktechniek

Жыл бұрын

@@ChupoCro Yes, that is right, I made a mistake there.

Thank you for the tear down, I will open to add USB port charge instead

The real time sampling rate is about 200 MSa/s, definitely not 1 GSa/s. Its ADC probably run at 100 MHz, same as in 1013.

Hello! Can you recommend this instead of Uni-T UTD2102E model?

@learnelectronics

2 жыл бұрын

Yes

무엇을 측정하는건지 화면에 잘보이게 찍어주면 도움 될것 같습니다.

사용법 자세히알려줘서 감사합니다 ^^

So I just purchased an open box of this scope at a reduced price. The unit itself is still in shrink wrap but there is no power brick provided. Any suggestions on a power brick. I know it’s 5 volts but any recommendations on current or wattage of the brick? Thanks… love your stuff.

@learnelectronics

Жыл бұрын

Get a standard 2500mA phone charger, works great

@bobrowles43

Жыл бұрын

@@learnelectronics Thank you... much appreciated!

15 x 10 is 150. From what I’ve been able to learn about oscilloscopes. You are supposed to multiply times 10 when you put the probe in the times 10 position?

@alleycatjack4562

2 жыл бұрын

On these scopes, you select x10 on the scope as well, so it takes care of that math for you.

P.S. Bang-Good are doing a Mustool Handheld scope (MDS120M) that comes with a large screen for you desk(not 100% sure if you get the screen with it!, but it certainly look's like you do.. but i wouldn't have my hope's up) It's Roughly 60 buck's, i hope they send you one to review. it looks great for that 1st scope for beginners.. i know Bang-Good send you stuff for you consideration(lucky devil you) ANYWAY WOULD LIKE TO SEE THIS ONE ONE YOUR CHANNEL. : )

what is the content in the 8gb microSD card?

Is this unit battery powered or does it have to plugged in?

@learnelectronics

2 жыл бұрын

USB powered actually. It has a 2.1mm barrel jack in the back.

Needing an Oscilloscope, thinking Siglent 1202X 200 mhz, What do you recommend? Under $400 also need Microscope for SMD, looking at Pluggable USB, on the cheap ; ) Thank You. . .

@curtstacy779

3 жыл бұрын

I have the 1202X-E, and I can tell you I love it. lately, I have been using it to build an HF radio and I have had no problems. the FFT works great also. I've used it in XY mode, I've built a probe and used it as a tracer. all works well. also, I have read signals well over 100Mhz and no problems.

So there is no way to calibrate this scope?

@learnelectronics

3 жыл бұрын

There is. Watch part 2

can someone tell me how on the oscilloscope Fnirsi 1014 how to re-reduce the sine wave of the house current? because I can only get a rectangular wave.

@learnelectronics

2 жыл бұрын

Turn down vertical sensitivity

@rodolfoberio9039

2 жыл бұрын

@@learnelectronics Have you tried to measure the frequency of a Thief of Joule? Very strange results.

Oo very curious

It's strange, I get 75mhz+ and stable on mine!

@dnkreative

2 жыл бұрын

This 100MHz range availableonly when you set probe to x10, for x1 it's much lower. Idk which probe multiplier used in this video

@SianaGearz

2 жыл бұрын

I expect that it has a singularity where it can't properly capture 100MHz and 50MHz but will capture other frequencies in the range, due to some sampling issues.

This is the same osciloscope as the 1013D but in another format. So no it is not a 100MHz and most important it's far from 1Gsps ...

@adriansmith31

3 жыл бұрын

It's Chinese 100mhz / 1Gsps so like most Chinese electronics you take the maximum it's rated at, divide it by half and then again by a random division then you get close to what it's really rated at. Found that especially so with power supply modules. Applies to this too. I have the 1013D it's adequate for my needs but in no way is it capable of doing as advertised.

Was you Navy Electronics? I was AT 81-85. Nice video.

@learnelectronics

3 ай бұрын

STS

Mine has a SD ERROR

You should to compare this device with other better oscilloscopes like Tektronix... Because this video is haven't show really objective data

Unfortunately, this scope, and the Yeapook 1040D which is just a re-branded version of the same scope, are both 30MHz scopes which are being falsely advertised as 100MHz. The industry standard frequency rating for a scope is the frequency at which the displayed amplitude of the signal is -3dB attenuated from the actual signal input amplitude. That's 70.7% of original amplitude. For this scope, that frequency is around 30MHz, NOT 100MHz. Therefore, it is NOT a 100MHz scope. I ordered one and found this out too late. I'm sending mine back and replacing it with a real scope from a different manufacturer.

Once you get to the conclusion that the 100MHz is not true and the 1GSa/s is not true then it is questionable if this can be described as an instrument.

那两个ADC一看就是国产9288，哈哈哈上当啦

좋아요 누르고 갑니다^^😊

Pero para que desmontar? Acaso arreglaste algo? No diste la vuelta ni invertir optoacoplador de canal 1 y 2. Muy mal

@geraldfactor5781

2 жыл бұрын

how do we know that opto coupler need to be invert? thanks

✌️

Sua ponta de prova deve estar 1:1

Can only watch and dream! With a salary of R5000, $150 amounts to roughly R3300 South African.

I found this channel trough search. Thanks for efforts. Saw Hantek 250$ scope and this one and matter of fact these reviews are useless garbage. If this was a toy then okey we saw how it looks alike. But its very important measuring device, so how can you review anything without checking side by side with another one!? Instead its "interesting". Just make sure your generators are working as designed at this particular moment, and make sure is this "modulation" is real or its result of how this scope is functioning. I get so annoyed.

@learnelectronics

2 жыл бұрын

Then feel free to fuck right off and watch another channel.

Nice price, bad band width.

Did they name the brand that way just to mess with people of the West trying to pronounce it? :J

@learnelectronics

5 ай бұрын

I wish I knew how they named things. They have done tongue twisters for sure.

First

Not knowing anything about Digital storage oscilloscopes I accidentally purchased this one. It's going to an Electronics recycling place.😠 If I don't recycle the Fnirsi, I'll just throw it in the dumpster behind my apartment. Homeless people dig out electronics to recycle ♻️ and cash in. I've got a Hantek oscilloscope I saw in a couple of u tube videos I've got my eyes on. Kinda in my price range for a beginner oscilloscope. Fnirsi and Yepook are counterfeit oscilloscopes 😠😠😠!!!

Lots of these units are faulty from the factory DON'T WASTE MONEY ON THIS RUBBISH.

This scope is a piece of JUNK that is nowhere near 100MHz, and the signal generator is there to suck you in to buy this overpriced (yes overpriced) piece of junk! Test for the REAL specs, not the lies it has!

@learnelectronics

2 жыл бұрын

Well geez there Stevo. Did yo have a bad experience with the scope? Fill me in and and maybe I can help.

@stevenbliss989

2 жыл бұрын

@@learnelectronics Where do I begin... do some serious performance tests and you will see, for starters it is NOT 1 1GS/s sampling, it is MUCH LOWER.

@stevenbliss989

2 жыл бұрын

@@learnelectronics Just do any single shot of a fast signal 10-30MHz, preferably non-repeating, and you will se that it FAKES the higher sampling rate by multiple RANDOM sampling at a MUCH LOWER sampling rate (likely 20-100MS/s) ...it is a FAKE PIECE OF LYING JUNK!!!!!!!!!!!!!!!!!!!!!!!!!!!!

@mikejones-vd3fg

2 жыл бұрын

@@stevenbliss989 Yeah ive heard that alot, it doesnt meet advertised specs but I dont need all that spec and it looks good everywhere else with its quick boot and response. If they advertized this as 30mhz scope would it all of a sudden be good? because thats the only complaint im hearing which is a non issue for hobbyist like me that intends to use it for audio amplifier circuits, but if theres something better in the price range, or theres something else really wrong with this unit please do share.