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Originally posted by robby_h
You say I was having trouble! When? I never mentioned my solution or attack on the coil's change in properties once.
I said that I can virtually submerse the coil in a very large quantity of magnetite and see no magnetic lag at 10usec but you say this is not so???
You now say..."I witnessed the lag on an oscilloscope over one month ago. Who knows, maybe I have super magnetite"...
Or was it that you didn't take into account contamination, eddy currents or the obvious change you would have seen in the coil's inductance if you had say measured this with a meter? This also applies to your...
"Best method to really verify it is just get sufficient coil, generate sufficient field and quickly collapse it. Not difficult so far. Then view the output from a small coil on scope. View with and without the magnetite."
You haven't told us how you would know what you are actually looking at here or how you would split this observation into its true components.
It also depends on which point in the circuit you saw this lag. If what you saw was a physical widening of the spike itself then it wasn't magnetic lag at all. The rx signal is made up of components, some from the ground itself and some from the coil and you indicated you had a solution for the latter but we are yet to hear this.
Practically everyone here has done their share of reading re the "theory" on the excitation and decay of these domains and this is just going over old ground unless it leads to something not readily known.
Nothing occurs "instantly" but surely we can use that term relatively, especially if we have taken an effect, even long gone before sampling begins, into account?
Now, maybe you could offer something practical before this thread ends. Your "obvious" solution to our coil "problem" would be a nice start.
I said that I can virtually submerse the coil in a very large quantity of magnetite and see no magnetic lag at 10usec but you say this is not so???
You now say..."I witnessed the lag on an oscilloscope over one month ago. Who knows, maybe I have super magnetite"...
Or was it that you didn't take into account contamination, eddy currents or the obvious change you would have seen in the coil's inductance if you had say measured this with a meter? This also applies to your...
"Best method to really verify it is just get sufficient coil, generate sufficient field and quickly collapse it. Not difficult so far. Then view the output from a small coil on scope. View with and without the magnetite."
You haven't told us how you would know what you are actually looking at here or how you would split this observation into its true components.
It also depends on which point in the circuit you saw this lag. If what you saw was a physical widening of the spike itself then it wasn't magnetic lag at all. The rx signal is made up of components, some from the ground itself and some from the coil and you indicated you had a solution for the latter but we are yet to hear this.
Practically everyone here has done their share of reading re the "theory" on the excitation and decay of these domains and this is just going over old ground unless it leads to something not readily known.
Nothing occurs "instantly" but surely we can use that term relatively, especially if we have taken an effect, even long gone before sampling begins, into account?
Now, maybe you could offer something practical before this thread ends. Your "obvious" solution to our coil "problem" would be a nice start.
ElectroNovice
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