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Test Equipment Schematic needed

Posted: Sun Jan 27, 2002 6:55 pm
by K8YS
MANY MANY years ago (25+!), I found a schematic for building an octopus... OK, so what is it? The octopus is a device that connects to an oscilloscope V and H inputs and displays a pattern on the scope. The pattern shows if the device under test is capacitive, inductive, resistive or is a PN junction. It works much like a Huntoon Tracker or the component checker on some of the cheaper scopes out there.
My scope does not have this feature and I would like to build one. I remember that the heart of the circuit was a 6.3v center tapped transformer but that was all.
I think that it got the name OCTOPUS from the military.
Anyone have a schematic? Perhaps it was in Radio Electronics in about 1972.
Thanks,
Bob
mailto:[email protected]

Re: Test Equipment Schematic needed

Posted: Sun Jan 27, 2002 7:45 pm
by Edd
Bob:
Seems like it was 30 yrs ago that I breadboarded
up an " octopus " to evaluate the ckt.Later when I was with NASA I came upon the good fortune to
get a Huntoon Tracker for a paltry $ 25 from the
surplus property department.....so I repaired same and have been using it since. It makes for a speedy initial semiconductor evaluation, then I can fine tune my evaluations with more sop-histicated equip.You,being a fellow ham, will find a post with supplemental info at:
www.btinternet.com/~g4wif/q_tech3.htm <p>Tnx and 73's de Edd Whatley

Re: Test Equipment Schematic needed

Posted: Mon Jan 28, 2002 4:09 pm
by K8YS
TNX EDD!
That is exactly what I was looking for!
73 OM
Bob

Re: Test Equipment Schematic needed

Posted: Tue Jan 29, 2002 9:14 am
by Gregg
<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by K8YS:
MANY MANY years ago (25+!), I found a schematic for building an octopus... OK, so what is it? The octopus is a device that connects to an oscilloscope V and H inputs and displays a pattern on the scope. The pattern shows if the device under test is capacitive, inductive, resistive or is a PN junction. It works much like a Huntoon Tracker or the component checker on some of the cheaper scopes out there.
My scope does not have this feature and I would like to build one. I remember that the heart of the circuit was a 6.3v center tapped transformer but that was all.
I think that it got the name OCTOPUS from the military.
Anyone have a schematic? Perhaps it was in Radio Electronics in about 1972.
Thanks,
Bob
mailto:[email protected]
<hr></blockquote>