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dbird 20/08/2020
Really pleased with this. Got it a month before the worst case estimate of Banggood. Checked it out just this evening. Scope mode seems to be pretty accurate at least visually with the small screen. And, the screen visibility is very easy on the eyes, at least indoors, which is where I'll be using it. Bandwidth seems OK, although I haven't measured it or checked the waveform risetime. My reference here is the old Tektronics 545 scope, which was 5 MHz BW, I believe. The rated input impedance is 10 Megs. Don't know if I believe that, but seems reasonable. I checked the loading on a geiger counter that I built. It's not high enough impedance to keep from screwing up the tube voltage, but that's not a surprise either. When I built the circuit I had to make a special probe to be able to see the tube waveform and voltage; that's still going to be true. One shortcoming of the scope functionality is that it has no AC trigger. That means that to get a stable waveform, you have to go into the trigger and adjust the DC trigger level. That works fine, but of course it's only good for the waveform you're looking at - a pain to mess with when checking out a circuit with multilevel waveforms. I'd give this product a 5 star but for two reasons. One is the just mentioned lack of AC trigger, the other is that 5 star ratings don't collect viewers usually because they don't convey any useful info. I'm a retired electronics engineer, and circuit designer. While I don't lack for a good scope, this instrument does have a very useful place in my home lab. Simplicity of operation with good insight into the basic waveforms of whatever I want to look at, with the two exceptions - extremely high impedance circuits, which take special stuff to look at anyway, and very low level signals, although it does go down to 30 mV per division.
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