consider a multimeter that we put the probes slightly on the surface of metal carrier without any pressure.
if the carrier has a good finishing, or it is a pure and good metal, the resistance measured by multimeter is a number for example under 1 ohm.
but otherwise, it may shown a number also about a few decades of ohms that is not constant and depend on the position of probes, the measured resistance will change rapidly.
if this carrier used to montage a board, the ground of ms line may degrade in quality and will affect in insertion loss.
i can simulate a ground with bad conductivity and see the results|! but i want to know in real world, any experience, any idea that may happen for other ones.
any idea,,, plz
thanks..