I have a Fieldpiece SC77 multimeter. I'm testing the ohms on some pre built tanks and coils. They all seemed higher than what I expected them to ohm out at. 2.4 some 2.2 etc.. 5-7 wraps on 30 gauge wire. So I dropped the rda and just simply touched the two test leads together. The meter read .7. Should I subtract this from my coil readings??
Need help with my ohm meter....
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I wanted to acknowledge that I've seen your question, however I'm not "ohmy" enough to be able to answer it ... sorry
Thanks for the quick reply. No way to zero it out. Even checked it on a hunk of metal and it worked its way back down to .7 So I'm assuming that's my 0 due to the lengthy test leads??
Now with that math, that drops my coil to 1.7 ohms. I'm only running an AW 14500 600mah. I'm hoping this is in the safer zone. I am happy with the clouds. However, with many new to mods, I'm wanting to build. But I'm the type that respects saftey. What ohms are the lowest for this battery? It doesn't seem as common as the bigger batteries more people are using.. Thanks again for everyone's input.
3.8v at 1.7 ohms is 2.2 amps, well within the safety margin. You don't want to push these batteries much past 5 amps. So doing the math, that's 3.8v at roughly .8 ohms. Personally, I like 1.2-1.5 myself, with 14500's, warm vape and decent run time.
When I touch the leads on my multimeter it reads ~ 0.3 When I test my sub ohm coil ( this is an example) it reads ~0.7 At this point I conclude I have a 0.4 sub ohm coil. I came to this reading, 0.4, because I subtracted the 0.3 (the measurement from the leads touching) from the 0.7 (the measurement of the rba, when using the leads with the multimeter. I usually make sure my calculation is correct by using a ohm meter, made for testing atomizers. I have both. I would make sure the multimeter is set to the correct function. Coils can fluctuate, slightly or drastically, for many reasons such as dropping the atomizer, adjusting the coil, adjusting or tucking wicks into position, or, possibly, tightening down the posts, the screws on top. If your readings do not make sense then something might be wrong.
Ok. Good to know.. So fiddling with the ohm calc, I find .8 ohms would hit 4.75 amps, which is too close for comfort for me... But wouldn't such low ohms on a single coil get super hot?? Throat irritating?? Correct me if I'm wrong, but less wraps equals less resistance equals lower ohms??
Yeah, I'm definitely in the market for one. It's just that I had this one from hvac service already. With the .7=0 all my readings of coils are what I would expect them to be..
Any good links for the atomizer testers??
Yes..the .7 ohm is the resistance "zero", so subtract that from your readings
How fresh are your batteries in your multimeter
if you push too much power on thin wire it can gets too hot...resulting in burned juice and nasty taste...most people on "regular" rigs run 6-8 watts
Maybe this chart will help
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There is a chart, that I never seem to have a copy of, around here that kind of puts green, yellow and red into perspective. It has voltage on one side, ohms on the top and you have watts in the middle. Most people, myself included like it around 8 watts. Watts is the amount of heat you are producing (simplistic terms mind you).
But as you are using a mech you will have voltage drop, right off the bat that 4.2v turns into 3.9 with sag from the load on it, then it will settle into 3.7v for a while before it drops and goes to about 3.5v. So the aim is to set it where the battery will be the longest, roughly 3.5v (including sag from the load)
So to get 8 watts at 3.5v we need a 1.5 ohm coil. But at 3.9v that is 10.5 watts. Now if we go to a 2 ohm coil, at 3.9v it's 7.6 watts and drops to 6.1 at 3.5v.
It's just a matter of what you want/like from your vape. Sure, you can run 3 ohm coils, you will get a cool vape without much vape, but a long battery life.
Clear as mud?
But as you are using a mech you will have voltage drop, right off the bat that 4.2v turns into 3.9 with sag from the load on it, then it will settle into 3.7v for a while before it drops and goes to about 3.5v. So the aim is to set it where the battery will be the longest, roughly 3.5v (including sag from the load)
So to get 8 watts at 3.5v we need a 1.5 ohm coil. But at 3.9v that is 10.5 watts. Now if we go to a 2 ohm coil, at 3.9v it's 7.6 watts and drops to 6.1 at 3.5v.
It's just a matter of what you want/like from your vape. Sure, you can run 3 ohm coils, you will get a cool vape without much vape, but a long battery life.
Clear as mud?
if you push too much power on thin wire it can get too hot...resulting in burned juice and nasty taste...most people on "regular" rigs run 6-8 watts
Maybe this chart will help
And then someone posts said chart!
Damn sure is nice to join a forum...
I've had these questions for months now... This single thread almost has me ready to build. Thanks for the help guys. I feel better not having to wear a hockey mask why hitting my vape..
Btw.. Does a sub ohm chart exist yet? Not that I'm ready but in the future maybe.
No, and I hope one never pops up! IF you want to go that road you really need to understand electrical theory a little better, battery draw, maximum "C" ratings etc...... There are a LOT more things involved when you get into sub ohm, the most important of which should be your brain!
I bought the little cheapie ohm meter from FT, and the readings change the more I screw the ATTY down...? Currently trying to check my Taifun GT, readings all over the place (depending how far it's screwed down)...place it on my ZMAX, and reads 1.4ohms (with a lot of adjusting of the centre pin...otherwise shows "Low load" or 9.9ohms, there's a certain sweet spot for the TGT's pin)
is there a better / more consistent way to check resistance?
is there a better / more consistent way to check resistance?
Less power, so a cooler vape with less vapor, but that's about it. My personal preference is 2.2 to 2.5 ohms, so I tend to be on the high side to begin with. I like it better than lower-ohm coils, others feel the other way 'round.
0.7 ohms resistance on your leads is kind of high (but not completely unreasonable). Try cleaning them with rubbing alcohol, or even just soap and water, to make sure there's nothing built up on them, then test again.
If you still see 0.7 then that really is your base resistance.
If you still see 0.7 then that really is your base resistance.
Yeah, I don't plan on going that route, especially with my little battery setup. I'm happy at around 1.7ish. I'm just wondering if the 1.2 range would be better.? But only if I can keep the heat down. I'd rather not increase temperature for a bit more cloud.. I guess that's the trick... To each their own.
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