How can one test the viability of a soldered joint?

Question

Resistance and conductance is right where it should be. Yet, I'm getting noise. How can I assess what a good connection is?

Answer 1

Test a solder joint visually or physically.
The joint should be shiny and have no meniscus (rounding like droplets) .
The solder should have flowed between conductors.
The joint should also not easily separate.
Look for other sources of noise, for example electrical interference.

Answer 2

Heat it, cool it, tap on it. Hell, just re-heat it, which will remove the possibility of a crack or a flux pocket or other adventure-producing defect. Depending on the sort of noise and the application, don't ignore the fact that there may be flux dripped between the joint and another part of the circuit. Sometimes this may cause noise. Clean everything off with flux remover, which is supposed to be great. I've never made anything sensitive enough to warrant it, though.

Answer 3

Just reflow the joint and be sure.

Put a little new solder on it to get some flux active and apply heat.

You can't measure noise.

Answer 4

There is a book about Soldering that practical electrician.How we can make smooth solder.First ,it must look shine and good.It must thiny and flat.We have to heat well and use right paste.You can use for assess a jumper cable.