2185Re: [cosmacelf] Test Equipment and Circuit Debugging, was Re: surplus MSI/88e
- Jun 3, 2004On Jun 2, 2004, at 11:05 PM, sbirdasn wrote:
> There's also BITSCOPE, a budget (or even roll your own if you like)Saelig also has inexpensive 8-bit and 16-bit USB-based logic analyzers
> A/D and logic (8-bits) capture-to-PC interface card.
> Link: http://www.bitscope.com/
> Maybe $300-400 is a bit much for your idea of "budget", but it's not
> bad compared to $4-6K (or more) for "real" test gear.
(a bit over $200 and $300 with clips):
There are probably some other similar products elsewhere. There's also
SoftLA, an old DOS program that B.G. Micro still sells for about $30,
add your own hardware to your PC parallel port for inputs. It saves the
trouble of writing the software, and allows 16 channels on
bidirectional ports. And being an "old DOS program" is no judgement on
its capability, a friend of mine who is also an
instrumentation/controls engineer swears by it.
Personally I prefer instruments that don't require a PC attached, but
PC-based instruments can be awfully cheap if you consider the PC
already paid for.
Lee's approach of using an Elf is pretty neat. To give yourself more
"bandwidth" you can reduce the operating frequency of the Elf under
study. When I first build one up, I usually start by clocking it off a
signal generator at 100KHz or so to make it easier to watch what's
going on (I've gone as low as 1Hz or clocked it off a switch, too.)
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