How to know if there's a short?

[FrostyDream]

So I've been trying to rebuild a vivi nova and some weird things are happening... I build it once, 5 wraps. On my multimeter it read 1.5 ohms. When I tried to use it on an ego batter it would fire for a second then stop and the button would stick on for a second longer then shut off. Does that mean their is a short? I rebuilt it again, this time 6 wraps... More wraps then before but not it reads .7 ohms, WHAT!? I thought more wraps meant more resistance, and disreguarding the direction it went, it changes by .8 ohms, how is that possible... Now since it's so low res I can't test it on my ego and I'm waiting for the replacement button for my sentinel, but even then what if there is a short, will my sony battery blow up when I test it?

 

[jkos]

After checking the ohms touch your leeds together and subtract that from your reading.e.g.1.5 ohms- .4 is usually what I get = 1.1. An ego battery wont fire below 1.2 or 1.3. When you rebuild try to keep the coils as close together as you can without touching.The coil at the top cannot! touch the sides of the head, that's probably why you're getting a low reading with 6 wraps. I've been rebuilding with 32 and 34 nichrome & kanthal 5 to 6 raps depending on what I want to achieve.for over a year now and pretty much haven't had any problems. Good Luck.

 

[FrostyDream]

i get 0.0 from the leeds, is that normal?

 

[pdib]

yeah, that can happen too.

Also, sometimes, in a Vivi, some part of your coil or your legs may be touching the metal surrounding. This will make a coil wrapped to be 1.8Ω into a .7Ω part of the circuit. So, it's a short circuit (the current is taking the shortest, easiest path into your viv "cup" instead through all that resistance wire)

 

[FrostyDream]

i moved it around and the res jumped to 1.5, now i have a stranger problem... I put the rubber cap on and tested, it fired... then i put the metal top piece on and no fire, the light stayed on for a little bit again. I take the top off and it fires again... the coil isn't sticking out so it couldn't be touching the piece of metal in the rubber cap. I don't know what's happening...

 

[jkos]

When you clip your wires off at the center pin make sure it is as close as possible, making sure it is not that causing your short. I had that problem before, , when I tightened down the top cap it put enough pressure on it to mash the center pin gasket and caused it to short out.If the positive center pin wire is sticking out to far it may come in contact with the threads when you tighten it down.

 

[jkos]

Forgot to mention I use a fingernail clipper to cut the wires, you can get it really close.

When you clip your wires off at the center pin make sure it is as close as possible, making sure it is not that causing your short. I had that problem before, , when I tightened down the top cap it put enough pressure on it to mash the center pin gasket and caused it to short out.If the positive center pin wire is sticking out to far it may come in contact with the threads when you tighten it down.