I got mine last Friday from Amazon; it was $79.98 with free 2-day shipping for Prime members. And as it is a "fulfilled by Amazon" item returning it for a full no questions asked refund is a simple as saying "I don't like it" and dropping it off at UPS--that's where mine is going tomorrow as it's triggered sweep modes (both "Single" and "Normal") are worthless--let me illustrate:
I set up my DDS signal generator to produce a chain of bursts of 10 cycles of a 10 kHz pulse wave, one burst each 500 ms. Displayed on my Hantek DSO 1062B (a fine instrument BTW) in "Normal" triggered mode it looked like this:
Applying that same signal to the 5012H produced this result (
I apologise for the shaky image, that's what happens when you're 72 and you last stroke (#2 for me) was just 4 months ago):
Note that although the trigger fires, only the last 4 to 6 cycles of the burst are captured/displayed. This indicates to me that the start of signal acquisition or display is delayed, and is occurring some 400 to 600 μs after the trigger fires.
A 1 or 2 cycle burst fires the trigger but none of the waveform is displayed--this makes the instrument worthless for serious diagnosis of nearly any 21st Century device where aperiodic signals are the norm. The trigger will fire and if you are lucky some part of the active waveform's tail-end might be captured. But if you are looking for a single 200 μs pulse you will never see it.
It's as though a fixed delayed sweep is incorporated into the 'scopes hardware or software--it might be something inherent in the design.
So, mine goes back tomorrow (free return shipping for Prime members), and Amazon will issue a refund to your credit card within 30 to 50 minutes of UPS scanning the return label--i really wanted to like this cutie, however until they resolve these triggering issues it's JATO (Just Another Toy Oscilloscope).
A final note, my other toy 'scope--a FNIRSI ADS 2050H (what is it with this "H" stuff, revision 9?) [5 MHz, 20Msps] does this to some extent but only sporadically, and then just a 100 μs or so delay.