General > General Technical Chat
Funny little problem - can you answer?
Benta:
--- Quote from: bdunham7 on May 04, 2022, 07:22:08 pm ---
--- Quote from: Benta on May 04, 2022, 06:49:23 pm ---Why would a current source (the multimeter) cause induced currents? The logic fails me.
--- End quote ---
Van Allen belts, solar wind, rotating earth magnetic field, etc.
--- End quote ---
Totally irrelevant. Do you really think he meant "around the moon" in a literal sense? Which part of "let's say" is misunderstandable?
The point was about an extremely long cable. Don't muddy the waters, please.
DavidAlfa:
A huge short, at least for a few days/weeks, until the cable charges up?
As per 82pF/m, given 2c length (600*10⁹), capacitance would be 49.2F !
Benta:
--- Quote from: DavidAlfa on May 04, 2022, 08:02:06 pm ---A huge short, at least for a few days/weeks, until the cable charges up?
As per 82pF/m, given 2c length (600*10⁹), capacitance would be 49.2F !
--- End quote ---
Who said the shield is connected?
magic:
Stop being practical.
My guess: OP wants to hear 50Ω.
FriedMule:
I am sorry had to run out the door, and I am sorry for my badly formulated question.
Let's say you had an Ohm meter that, let's say measures twice a second, it is able to measure the cables.
You measure the center conductor. Your Ohm meter is not particular fantastic, so if you measure 1 inch or 10 inches will just be detected as about zero Ohms.
I have deliberately chosen the RG58 because it is a general "standard" without being too technical in frequency, shielding or material.
The question is mostly about what you would imagine your Ohm-meter will say when it returns a measuring result before the Ohm-meter's signal can have time to travel all the way. :-)
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