That turns into 500mV/div with a 1:10 probe, which you need to get a decent bandwidth.Īnd if it can’t even display a simple sinewave properly, what will it do to a real signal you want to measure?Īn important function of an oscilloscope is to be able to capture occasional glitches, but with all the signal processing this gadget does to hide it’s own limitations it’s very unlikely it would be capable of showing those at all.īut even worse then all of this is probably that this manurefacturer blatantly lies about it spec’s. The 50mV/Div is another quite significant limitation. I’m not even sure if this thing is capable of single shot operation. You can only guess at what the actual samples this toy takes of your circuit look like. The wobbly waves the tops of even a 10MHz sinewave are another strong hint for averaging. My Rigol DS1052E can show very similar artifacts if you turn on averaging and average a lot of traces. The big artifacts that look weird to Kerry Wong are caused by averaging. The biggest trouble with this fnisrsi stuff is that it’s so bad that you can not trust what you see on the screen. Posted in Reviews, Teardown Tagged FNIRSI, oscilloscope Post navigation It is amazing how much times have changed for cheap ‘scopes. Last time we checked in with, he was looking at cheap ‘scope meters which fared better for a similar price. His exact quote was: “I wouldn’t touch this ‘scope with a ten-foot pole.” wasn’t impressed and, from what we saw, we weren’t either. Granted, the scope is cheap, but maybe it is just too cheap. The teardown shows there isn’t much on board and the design doesn’t seem very sophisticated. In addition, there was some measurement offset as frequency increased. However, it appears this is vastly overstated. The scope claims to have 100 MHz bandwidth. There were some display oddities as the horizontal sweep changed. The scope did start up fast and had responsive controls, which is good. While the specs are relatively modest, wasn’t sure the instrument was even living up to them. For example, the encoder knobs don’t have a push button function, making the scope more difficult to operate. The ‘scope looks like a lot of other inexpensive ‘scopes, but you can see some concessions to price. He did, however, like that it is USB powered so it can be operated from a common battery pack, which would make it truly floating. Can you get a reasonable scope for that cost? has a list of issues with the scope ranging from short memory depth to low sensitivity. You can usually find these for well under $200 at the usual places. His recent video is looking at a very inexpensive FNIRSI 1014D ‘scope that you can also find rebranded. We always enjoy watching put an oscilloscope through its paces.
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