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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
lol!!!!! i've seen a better 'scope using a PIC microcontroller (12F675) running at 27 MHz, driving a small CRT from a camcorder... :)
8 bit is really sucky, but OK for audio work. I suppose it could be useful to compare two signals, but the real grunt work requires a DSO and/or at least 500MHz 'scope.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
I would say quite the contrary, 8 bits is more than you would be able to discern on a normal 4" CRT scope (in order to get 8 bits out of a 4" analog scope you would need to be able to measure to about .015").
Also 150MS/s should be plenty fast for most of the work we do, as long as you don't try to get into coils running at 10+MHz...
Registered Member #1497
Joined: Thu May 22 2008, 05:24AM
Location: Toronto, Ontario, Canada
Posts: 801
On one hand you have the ability to capture events on PC scopes, even a free version using the soundcards ADC, and for certain tasks capture is invaluable or even required, but even my ghetto 20MHz Philips scope works wonders compared to the physical interface of a computer. The knobs are a great asset compared to dragging virtual knobs using a mouse, not to mention that there is the ever so slight risk that cheap models might not have proper isolation, thus frying your laptop, costing more than a used scope.
Another downside to real scopes vs PC scopes (or digital) is that at very long time divs, the draw time (on some tube based scopes) can be so long that you can't get a good impression of the waveform, whereas capturing scopes can display the waveform in its entirety.
Registered Member #1321
Joined: Sat Feb 16 2008, 03:22AM
Location:
Posts: 843
Well I decided I'm going to get one of these usb scopes. I would've preferred a "real" scope, but to get the equivalent bandwidth would cost almost three times as much money...which I just don't have to spend.
I almost went with the Owon 25 Mhz stand-alone, i.e., "real" scope, until I realized that it doesn't have a TFT LCD display.
I wonder if there's any affordable way to isolate a usb scope from a computer?
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