Thanks for the links to logic analyzer info. Looks interesting. Maybe that is what I need? I'll look into it.
-----Original Message-----
From: mike <...@pikeaero.com>
To: n8vem-s100 <n8v...@googlegroups.com>
Sent: Tue, Jul 10, 2012 8:30 am
Subject: Re: [N8VEM-S100:907] oscilloscope recommendation
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Are you sure you want a scope and not a logic analyzer?
A pretty good, and modestly priced logic analyzer
http://www.sparkfun.com/products/8938
http://www.saleae.com/logic/
The software can run in demo mode so you can test drive before you buy.
I find I use my logic analyzer far more often than I use my scope.
Of course there are times when you need an analog scope. Personally I
have a antique Tektronix RM 565 ( like this one -
http://www.wrljet.com/tektronix/RM565/565_01_RJP.jpg ) that I keep
wishing will die so I can get something new (and weighs less than 50
pounds), but the darned thing just keeps going, and I have a spare CRT
and vertical amp module, so I'll probably die before it will.
- --Mike
On 07/10/2012 12:59 AM, norwestrzh wrote:
> My old scope was sold by JDR (San Jose, CA.). It was cheaply made
> (in Korea), and that is why I could afford it. It was 35 MHz, dual
> trace. Probably had way more capability than I'd ever need. I
> would be using a scope to troubleshoot the S-100 cards produced by
> John and Andrew. Probably 10 to 12 MHz would be the fastest signal
> I'd ever be looking at. For example, I was trying to get the ZFDC
> card working. The enables on the two bus interface LS244s (U16 and
> U25) remained high during I/O even though the LS682 (U23) and the
> LS139 (U19) appeared to be working as expected (using a logic
> probe). I tracked this problem back to the LS32 (U20). The two
> inputs to the gate were wiggling (as expected), but the output
> remained high. The chip was OK, so I was going to look at the
> relative timings of the two inputs. That's when my scope died.
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