Re: gEDA-user: Need opinion on O-scope

[John Griessen <john@xxxxxxxxxxxxxx>]

Robert Butts wrote:
> I found an oscilloscope on ebay 

HI Robert,


http://cgi.ebay.com/TEKTRONIX-7844-DUAL-BEAM-OSCILLOSCOPE_W0QQitemZ180280369955QQcmdZViewItem?hash=item180280369955&_trkparms=39%3A1|66%3A2|65%3A15|240%3A1318&_trksid=p3286.c0.m14

I like my 7844 for comparing two traces that are fast.  It is two 
cathode rays in one tube, and you can line up the two, (change their 
offset), for side by side comparing.  The fact that there are two sets 
of controls on the mainframe is confusing though...  As in vertical bay 
to trigger from selector A and  vertical bay to trigger from selector B ...
Intensity A and B...
Horiz sweep bay selector A and B.

There are three 7603's for sale cheap in both rack mount layout and 
vertical box, ( $70 to $100 shipped), but not from a "engineer type" 
seller.  The one I have is down at the moment, but people on tekscopes 
are ready to help me debug it.

7603'sjust have three plugin bays, so they're simple to operate.  NOne 
of the above confusions for you or your helper turning the knobs.

You could buy a few as a gamble and pass along the broken ones to 
whoever is helping you with the physical part of using these scopes with 
knobs.




If you are thinking of turning knobs on plugins and mainframes with a 
mouth stick, some of them are fairly high torque.  The volts/div knobs 
are  high torque.


If you want to hire some mods made to a scope you choose, you can ask 
me.   I am in odd jobs mode now after a bankruptcy to pay for some 
product development.  I would rather do some Tek scope repair and 
checkout than remodeling work.  That's closer to spending time in my lab 
on my ecosensory stuff than refurbishing well-off-folks's homes.


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