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RE: [N8VEM-S100:907] oscilloscope recommendation
I really would recommend a Saleae or USBee logic analyzer over a scope for
these boards. You often need to see multiple lines at once.
John
From: John Monahan Ph.D
e-mail: mon...@vitasoft.org
Text: mon...@txt.att.net
-----Original Message-----
From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On
Behalf Of mike
Sent: Tuesday, July 10, 2012 8:30 AM
To: n8vem...@googlegroups.com
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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