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Useful "non-standard" test equipment
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Atomillo:

--- Quote from: AVGresponding on August 04, 2022, 05:19:43 pm ---
--- Quote from: Atomillo on August 04, 2022, 09:12:37 am ---
--- Quote from: AVGresponding on August 02, 2022, 07:16:23 pm ---Home made 4-wire short. No solder, low mass, made from a single piece of high quality solid core conductor, all to get as low a thermal EMF as possible without spending daft money.



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I would only advise regular cleaning before measurements in order to avoid the thermal EMF generated in the interface between copper and copper oxide.
In a sense, one wants the maximum area of exposed copper to minimize resistance but on the other the more copper surface there is (without any protection like for instance gold plating) makes oxide more likely to appear.

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Yep. Fortunately it's rarely humid here, so shouldn't oxidise much. I wonder if it would be worth getting one of those gold plating kits? I don't imagine making one out of gold wire would be cheap...

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Not only that but I suspect the plating would fall over time. In my opinion the best course of action is just cleanliness and being thorough. Besides, in most nanovolt measurements you already have to worry about things like the phase of the moon so just another thing more isn't so bad!
JohnG:


I keep meaning to pull out the center row, because sometimes its a pain to connect to the innermost binding posts. In never happens, probably because it would take me more time than it is worth.

John
pdenisowski:
Can't recall if I posted this before, but I recently was trying to find a high current (40A) load for some testing / demonstrations

After experimenting with batches of cement resistors suspended in mineral oil, I took the easy way out and simply bought a cheap automotive battery tester.  Works great :)

[Please don't try this at home ...]
pdenisowski:

--- Quote from: evb149 on August 02, 2022, 01:52:17 am ---It used to be handy to have something like an AM radio handy at the bench.... You could maybe tell if your circuit was oscillating or glitching by the noise the receiver picked up from it.

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This.  I used to do RF interference hunting / direction finding professionally (using the best equipment money can buy), and I used to half-joke that some interference sources were so bad that you could find them with an AM radio and a coat hanger. :)

Power line noise (i.e. noise radiating from outdoor electrical power distribution lines) could often be localized to within 100 meters or so simply by tuning to an "unused" AM radio frequency in your car and driving around until you heard the distinctive 60/120 Hz "growl" of power line noise.
duckduck:
Relevant threads:

https://www.eevblog.com/forum/testgear/show-the-homemade-equipment-you-are-using-now/ - Check out the filthy hack jobs I built. If it works it looks beautiful to me.

https://www.eevblog.com/forum/testgear/diy-test-gear/
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