The Parallax USB 'scope is affordable but its bandwidth is only 200 KHz
(that's KHz, not MHz). OK for a classroom demo, maybe.
Link Instruments has one with a 60 MHz bandwidth at 100 Msa/sec that's
US$525 to $725 depending on options.
I haven't used it but I do have one of their (older) PC-based logic
analyzers that I've been happy with.
There's also the good ol' BItscope http://www.bitscope.com that has a
100 MHz bandwidth and sampling rates up to 40 MSa/sec. US$300 and up.
These are actually designed and manufactured by usb-instruments.com. It
should be noted that these will only work with Windows. I've contacted
them about supporting other platforms and they're vehemently opposed to
anything other than Windows. For most that's probably not a problem, but
if you want an open platform with more bandwidth and support for Linux,
than I recommend the Bitscope (bitscope.com).
They are actually the same company that puts out the Easysync USB to RS-232/485
etc,. converters, which just happens to also be the same company that designed
and distributes the FTDI chips that are so popular right now.
E-Mail Contact Page: http://www.e-dotcom.com/ecp.php?un=Dontronics
I have a two-channel Velleman DSO box similar to this
Mine's in the same size box, powered by a wallwart, connnects to a
PC's parallel port. Sorry, not USB - if your computer doesn't have the
venerable parallel port, you could get an older one to use with a box
like this. This has "decent" specs, something like 30 or 60MSPS. I've
got an old 100MHz pentium system dedicated to this box. Controlling
the trigger, sweep speed, vertical gain, etc is all done with the
mouse on the screen. I paid something like $200 or $300 (I forget) for
it about four or five years ago, but I don't see anything similar now.
I suppose the big market for PC-based DSO's is for more expensive,
higher end systems.
Polytechforum.com is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here.
All logos and trade names are the property of their respective owners.