ADS5012h Handheld Digital Portable Oscilloscope Mini Storage Oscilloscope Kit with 100MHz Bandwidth 500MS/s Sampling Rate 2.4'' TFT LCD Display

At first I was sure it was a misprint - a hand-held 100 MHz Scope so reasonably priced - NO, I mean SO VERY LOW priced, with good sensitivity that includes auto-adjustment for sweep speed and amplitude and it triggers consistently on common wave forms? I'll wake up in a minute - pinch pinch, Ahhh... then I started reading reviews and someone who is experienced found a weakness (I REALLY didn't want anyone to find any serious faults <sigh>), and what he described looked like a serious problem, and one I would typically expect as someone who has developed firmware for small devices such as this (but never for a baby oscope THIS cute and well equiped). I left him a comment saying that maybe he had a defective unit. Hey, IT HAPPENS! I've sent things back that failed right out of the box. Not wishing bad luck on anyone (but hoping he had some bad luck), I took a chance and ordered one. I was also very motivated because the 4 channel 350 MHz delayed sweep Tektronix I bought surplus a few years back lit up like a bonfire on my work bench one afternoon a month or two ago - and I'm talking like a propane hot dog cooker run amok! (And I'm STILL looking for parts - it fried several traces on a PCB, and a dozen parts looked more like charcoal than anything else on Earth! (except real charcoal) - Anyway... like I said, I ordered one and took a chance. And for once, it worked out GREAT! It usually doesn't when someone who obviously knows what he is talking about says it doesn't work - and I DO believe him when he says his unit did not work. I can tell he KNOWS scopes.Of course, you know what the first thing I checked was when I got it - I grabbed my dual channel signal generator that does Burst mode and set it up - I went to channel 2 made sure it its was defaulted to 5 volts, went back to channel 1 and set the freq to 100KHz (10 was too low for a decent test) plus I set the duty cycle to 25% to thin the pulses a wee bit, then went to MOD (modulation) and set the type to BURST, and promptly hooked up "The Little Itty Bitty oScope that Could" and hit the AUTO button! And WHAMO, the firmware did its thing and it set up the amplitude and horizontal sweep correctly and I had 5 of the prettiest little pulses you could want solidly on the sceen - BUT WAIT - the very first part of the first pulse was missing... YIKES! (...QUEUE the Ominous music...), yes the trigger circuit locked beautifully, but I wanted - no NEEDED - to see what the other reviewer looked for - the leading edge of the VERY FIRST pulse! Then I remembered what I read in the little booklet - the MODE button toggled the little cursor keys (up, down, left, right) between Voltage/Sweep-speed and Trigger adjust/delay when trigger is in Normal mode - so into NORMAL mode I went and sure enough, the left and right cursor smoothly adjusted the pulse train to the right, and there it was, the leading edge trigger point of the 5 pulse burst (SEE THE IMAGE I uploaded).So Whinnie, Tigger and I have a new toy that works quite well (as advertised) for the 100 acre woods workshop (100 MHz woods?), and we just left Eyore a ways back on the trail asking "Oh Pooh, are you sure it isn't broken? Mine are always broken... always... oh bother."And I thank the other reviewer who did the comprehensive review (I learned something because of his detailed review), and I am sorry his unit didn't work. He may want to give it another try. I am back to poking around in the HF amplifiers I was testing and adjusting, and this little scope is my new Best Friend, at least until they come out with a 500MHz 4 channel unit with control via mental telepathy for 50 bucks! YOWZA!And BTW, the battery REALLY DOES last at last 8 hours! I kid thee not. VERY IMPRESSIVE! But I DO have one REAL CON. The micro-USB charge port is recessed so far, they had to supply a longer than normal USB plug - most regular length ones will not work. But, that this is SO minor I am calling it a feature and not a bug.

January 9, 2020 Initial ReviewDue to power plant shutdowns in California we bought a generator to power essential items in the house. We had an electrician install a 30A connector for the generator that is wired into our house power panel. Total cost was about $2,000 so adding a little bit for an instrument like this little Oscilloscope wasn't a big cost factor. What a great little tool this is.I watched a video of someone observing the waveform of a 120V outlet from their generator. Based on that video I went on a search for a similar meter, then ran across this nifty little O-Scope. I had used large, expensive, complex oscilloscopes in my career and was quite surprised to find this one for such a reasonable price, and it being small, light, and portable.All I really want to do is take a look at how clean the AC power is coming out of the new generator. We have a friend who owns three generators and has had to use them recently. They reported that the unclean (assumed) power coming out of their generators was damaging equipment in their house including their stove and flat screen.In order to use the Yeapook I first made up a pigtail with the three wires exposed. I labeled the wires, then plugged the pigtail into a power strip. I connected the probe and ground wire, turned the O-Scope on, and switched on the power strip. The scope showed activity but it wasn't triggering. I simply pushed the Auto button and the clean city 120V power waveform appeared stable on the display. That's all I needed to do.The next event will be to get the generator out of the garage, start it up, and repeat the same check with the scope on that 120V source. If the signal is clean I will trust the generator to power our electronic devices. If the signal is not clean I will restrict what can be powered by the generator. An alternative if the signal isn't clean would be to use the 120V output of the generator to charge batteries which can then in turn be used to power electronic devices.I'm very pleased with this little Yeapook Oscilloscope.

Let me begin by saying this unit is still excellent. Great value for the price, and much more convenient than lugging around a full sized scope everywhere.My only complaint is when I am trying to measure ripple on power supplies.Just today, I was at a customer site where they were powering something using a 24V switching power supply.The unit they were powering requires a ripple of ±1V at 24V.I figured I'd just zoom in on the 24V signal and check the peak-to-peak voltage across it.Unfortunately, the furthest I can zoom in is 5V per division. Any more zoom than that (such as 1V per division) results in the signal being off the screen.Normally, I'd vertically adjust the signal down to appear on the screen, but the scope limits you to a vertical shift of ±4 divisions. So at 1V per division, I can only move the scope down 4V.This means that when my zoom is set to 1V per division, I can see anywhere from 0-8V, so my 24V signal is too far away. Using 5V divisions allows me to see from 0V to 40V, but that's too far zoomed out to notice any ripple in the supply.Zooming in is really only useful if your signal is anchored around (or near) 0V.This seems like there could be a software update to allow more vertical movement. If that was possible, I'd absolutely upgrade my rating from a 4-star to 5-star.