Hello again,
Thanks for the replies and measurements.
I tested some more of mine and found some are sub 1 ohm, like 0.5, but others test to 1.2 ohms or around there.
I took one bottom off and pulled out the little metal mechanism that holds the wire when it is inserted into a hole. It looks like a straight metal channel piece with 5 fingers coming up on both sides. The finger are what grabs the wire and holds it in place.
Even apart i can still stick wires into it, so i stuck two small jumpers into it and measured again. At first i got around 1 ohm, but then if i squeezed it between thumb and forefinger i could make the resistance go down to very low like 0.2 or something like that, maybe 0.1 even. When i let go it goes back up.
I also checked a higher quality board and it basically says that same thing, around 1 ohm maybe 0.5 if i am lucky.
The metal inside doesnt seem strong enough to hold the lead tight enough. There is no visible oxide anywhere and two tests boards are brand new never used.
From what i can see the results are a little too variable, as Audioguru also pointed out. They work for digital gates and stuff but not very well for an application that needs low, consistent resistance.
If you were one of the ones who found low resistance like 0.2 ohms, try moving the lead around a little and see what happens. Keep in mind that you need an ohm meter that can read fast enough to catch any changes. Mine updates about every half second. You can also use a small test current if you like of course.
The ultimate test is on the scope with a current. I would bet that moving the lead a little results in a bunch of noise on the scope. I might try this myself at some point.
Also keep in mind that if the source is high impedance it may not be noticeable because even 10 ohms wont stand up against a 1 megohm input.
Chemlec:
What projects?