Call to all induction coil friends
Physikfan, Wed Jan 11 2017, 09:46AMHello to all induction coil friends
I have found that at least 50% of all my induction coils,
for Leybold induction coils this percentage is higher,
NO electrical DC resistance below 100 Mohm is measurable with a DC ohmmeter,
I would like to ask all owners of induction coils (large or small, self-built or commercial)
to measure the ohmic resistance of the respective secondary coils
and to report these measurements under this posting.
First with the usual 1.5 V DC, in addition if it is possible, please also with 10 V DC and 20 V DC.
To find out possible causes for this behavior
I would like to start with the statistical background as a first point.
With best thanks in advance
Physikfan
Re: Call to all induction coil friends
Physikfan, Wed Jan 11 2017, 11:16AM
To make this issue even clearer:
If the resistance of a secondary coil of an induction coil has a value which is too high, greater than 10 Mohm, a defect is present.
This does not mean, however, that such induction coils do not function in the conventional sense, these can still give sparks of a considerable length.
For a longer operation, however, this means that at least an arc discharge is formed inside the secondary coil, which sooner or later ultimately kills the secondary coil.
However, it also could be that the ohmic resistance assumes a very high value at very small voltages in the range of 1.5V DC due to some contact problems, corrosion etc., whereas a useful ohmic resistance can be measured at 10 V or 20 V DC.
Physikfan, Wed Jan 11 2017, 11:16AM
To make this issue even clearer:
If the resistance of a secondary coil of an induction coil has a value which is too high, greater than 10 Mohm, a defect is present.
This does not mean, however, that such induction coils do not function in the conventional sense, these can still give sparks of a considerable length.
For a longer operation, however, this means that at least an arc discharge is formed inside the secondary coil, which sooner or later ultimately kills the secondary coil.
However, it also could be that the ohmic resistance assumes a very high value at very small voltages in the range of 1.5V DC due to some contact problems, corrosion etc., whereas a useful ohmic resistance can be measured at 10 V or 20 V DC.
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