say i rebuilt a head for my vivi nova and test it with a digital multimeter with leads. what if my coils are touching or i have a short, what should the multimeter read?
digital mulitimeter with leads question
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If you have a short, the DMM will read the same as when you touch the two leads together. Usually there is a small amount of resistance in the leads themselves. Mine reads .2 when the red and black leads are put together and the meter is set at 200.
This depends on the guage of wire used and how much you're using. You can find the ohm/ft(or in.) for kanthal easily. If it's say, 2 inches of wire and 1.1ohm/inch, you should be reading 2.2 ohms, or pretty danged close to it. If they're touching it'll be down into the 1.x's. Where they touch will get hotter than the rest of the coils. If they're touching the metal "cup" then you'll get a VERY low res (most likely ~0.2).
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Not really relevant when winding a coil because no two people will wind it the same. I measure the meters internal resistance and subtract it from the reading I get when I finish a coil.
As far as what the meter will read if you have a short, it will be zero or whatever your meter reads when you touch the leads together.
The easiest way to avoid a short is to slide the coil all the way to the negative side of the tube. It doesn't matter if the negative side of the coil is touching. Just need to make sure you're using the same side as the negative on the bottom. This is what I do as a beginner at making coils. Once I get better at it I will try to center the coil but I don't think it will make much of a difference.
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