ok i just got the itast vv v3 and have been playing with the resistance meter that it has and im confused. i put a 2.4 ohm coil in and checked the resistance and it came in at 2.3 i check a few other 2.4 coils and they were all 2.3 or 2.4 resistance. then i put a 1.8 ohm coil and it displayed 2.5 resistance, i checked the same coil a few min later and it showed 2.4 so i guess is ohm and resistance the same thing and what all does this mean, if they are the same thing why is the 1.8 displaying so high then, whats going on here.
ohm and resistance questions
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ohms = resistance
A premade coil/head/carto almost never is exactly the ohms it is labeled. There is usually a plus or minus .2-.4 ohms. Sometimes you do get a bad one that is way out of that range.
A premade coil/head/carto almost never is exactly the ohms it is labeled. There is usually a plus or minus .2-.4 ohms. Sometimes you do get a bad one that is way out of that range.
ok but the 1.8 showing 2.5 is way out of range. if the coil is going bad will it show very low resistance then?
It might have been wrong from new but in my experience as coils get used and gunk up the resistance does tend to go up.
May also be miss labeled for actual coil wrap or one of the coil legs may not be making to the body or center + pin.
I generally see a drop from high to accurate on a new coil build in a Clearo head as the coil legs establish a decent connection the the atomizing body. They are just pressure connections.
I don't have a tester specifically for vaporizers, but have a regular electrical tester. How would I verify it is reading right?
I tested it on some used coils and it read it about .5 higher than what the coil shows.
After reading this thread, I know used coils will read higher.
I'm wanting to rebuild my pt2 coils, and want to do it right.
I tested it on some used coils and it read it about .5 higher than what the coil shows.
After reading this thread, I know used coils will read higher.
I'm wanting to rebuild my pt2 coils, and want to do it right.
The only way to verify it is to test with a known value resistance. Some meters are better with these low ohm values than others. Most are designed to read K ohms or Mega ohms. Not 1.3 ohms. 
Maybe a local vape shop has an ohm-meter they think is reliable. Go buy a coil of whatever type you use, bring your meter, and compare.
Also, note that some meters don't auto-adjust for the lead resistance. If you touch the two leads together, the meter will either zero out (auto adjust) or it won't. If it doesn't.....you need to subtract that result from the result you get when checking a coil. Example: You touch the leads together and get .2 ohms. You need to subtract .2 from whatever reading you get when checking the coil. Because the lead wires have .2 ohms resistance.
That's a good practice....to touch the two multimeter leads together before taking an ohm reading.
All that said, you can get a rough idea by just using it for several new coils. Over time, you'll get a feel for how it reads (if you don't have a vape shop near you or a vaper with a different ohm meter).
Maybe a local vape shop has an ohm-meter they think is reliable. Go buy a coil of whatever type you use, bring your meter, and compare.
Also, note that some meters don't auto-adjust for the lead resistance. If you touch the two leads together, the meter will either zero out (auto adjust) or it won't. If it doesn't.....you need to subtract that result from the result you get when checking a coil. Example: You touch the leads together and get .2 ohms. You need to subtract .2 from whatever reading you get when checking the coil. Because the lead wires have .2 ohms resistance.
That's a good practice....to touch the two multimeter leads together before taking an ohm reading.
All that said, you can get a rough idea by just using it for several new coils. Over time, you'll get a feel for how it reads (if you don't have a vape shop near you or a vaper with a different ohm meter).
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Thanks for the info. I've also found another idea on ukvapors. I'm relatively new, so if I'm not supposed to link to or quote other sites, let me know.
Calibrating a multimeter
"The easiest way to check your multimeter is by buying a resistor of known resistance and similar value to that which you intend checking, e.g. 3.0 ohms. This can be picked up from an electronic shop for a few pennies. With a fresh battery in your meter and the meter set to the lowest reading touch the probes together and write down the resistance. Then measure again with the known resistor in place, subtract the first reading from the second. This should be the same as the value of the resistor and give an idea of your meters accuracy if it is not. "
Calibrating a multimeter
"The easiest way to check your multimeter is by buying a resistor of known resistance and similar value to that which you intend checking, e.g. 3.0 ohms. This can be picked up from an electronic shop for a few pennies. With a fresh battery in your meter and the meter set to the lowest reading touch the probes together and write down the resistance. Then measure again with the known resistor in place, subtract the first reading from the second. This should be the same as the value of the resistor and give an idea of your meters accuracy if it is not. "
Yeah. That's what I just said.
I used an atty coil rather than buying a 3 ohm resistor you'll never use. But, since a coil is also a resistor.....same thing.
However, just note that any resistor has a +/- % error. So it's best to check it so you know it's REAL resistance value...not just he one printed on it. So then you can compare real values. But that's where you'd want to have another meter check the value of the thing...see?
Sorry, after I posted that I realized it was what you said. I guess it just didn't sink in the first time.
Thanks for your help. I did the touching the leads together and got a .3. I got some premade coils and when I tested them and then subtracted the .3, it was spot on.
I had to get the premade, because I don't have the supplies to make my own yet.
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Thanks for your help. I did the touching the leads together and got a .3. I got some premade coils and when I tested them and then subtracted the .3, it was spot on.
I had to get the premade, because I don't have the supplies to make my own yet.
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another thing you could look into is a mod stand with a ohm checker on it, or just an ohm checker that you can also build on, they run like 20 bucks at you local vape shop.. I personallu stick with multimeter. make sure your leads are high quality if not you can order somr good leads online
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I've looked into the ohm meters, but didn't want to buy one until I knew I could do it and I already had a multimeter and once I figured it out, I like it.
I plan on getting a mod in the near future, but didn't have one yet. How accurate are they? I guess it would be spot on especially if that was what I was going to use it on.
Thanks for the tip though.
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