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From: email@example.com (Glenn Gundlach)
Subject: Re: How to build your own Oscilloscope?
Date: 22 Sep 2002 21:28:55 -0700
References: <0vcj9.172680$Jo.55878@rwcrnsc53> <firstname.lastname@example.org>
NNTP-Posting-Date: 23 Sep 2002 04:28:56 GMT
email@example.com (The little lost angel) wrote in message news:<firstname.lastname@example.org>...
> On 22 Sep 2002 11:20:19 -0700, email@example.com (Glenn Gundlach)
> >Just looked at eBay. Tek 475 dc-250 mHz less than $100. If you have a
> >computer, I bet you can afford $100. Tek 3012 DPO starts at $3000.
> sorry to butt in but how does a newbie know if the oscope is working
> or not? I want to get a scope but know next to nothing about chosing
> one :D
So if you built one yourself, how would you know if it was working?
Not trying to be a pain in the butt (though succeeding anyway),
measuring signals is not a trivial issue. A good, old scope (Tek, HP)
is more useful to me than an unknown. Timing references are very easy
to come by. Any network television signal will have a well defined
subcarrier (3579545 Hz) to derive all the sync and blanking pulses.
For amplitude, the cal pulse is usually adequate. A precision voltage
reference is not very difficult. An AD588 from Analog Devices will be
within 3mV on a 5 volt output, laser trimmed at the factory.
The scope I mentioned earlier was on, showing a trace. That is a
pretty good start.
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