Trying to understand what my multimeter is telling me...help?!

[fourthrok]

I was given some XXL dual coil cartomizers that were said to be "about" 2 ohm. I don't deal with dual coils much because I don't like how hot they vape, and how fast they run through juice and battery life, but these were a gift...so I thought I'd try them. I tried to see exactly what ohm they were using a multimeter...and it said the carto I was testing was 4.2 ohm. Is this normal with dual coils? Is what it's saying is that it reads a 4.2 ohm coil in there and to determine the overall ohm of a dual coil...just divide it in half? Or is the dual coil really going to vape at 4.2ohm?

 

[steved5600]

If you are testing between the center post and the outer metal that is the ohms reading. Sounds high but I've never used a dual coil. What they must have done is put them in series. Series means that one lead of both coils are connected and that the two outer leads go to the contacts on the atty. So you have two 2.1 ohm coils in series equaling 4.2 ohms. That will require higher voltage to use but if you have a good VV PV then you should be able to use it.
IF the coils had been hooked in parallel the resistance would have been .6 ohms. So your coils are in series which is the easier way to do that.
with Series resistance you just add up the ohms with parallel you use this formula 1/R1+1/R2=1/R total
So you take the reciprocal of R1 plus the reciprocal of R2 and add them then you take the total and hit the reciprocal button one more time on the calc. Reciprocal is the 1/x button

 

[steved5600]

Here is a chart to make the voltage and ohms calc easier.

 

[steved5600]

Here is something I have been working on. It's still not complete but it will help.View attachment coils.pdf
So if there are errors someone let me know it's not complete yet.

 

[billo]

When you short (connect) the two ohmmeter leads together do they read zero ohms ? If not, subtract this reading from the 4.2 ohms. I'm assuming you have a digital meter.

 

[steved5600]

When you short (connect) the two ohmmeter leads together do they read zero ohms ? If not, subtract this reading from the 4.2 ohms. I'm assuming you have a digital meter.

Should have said that. LOL got spoiled by my meter.

 

[tnt56]

a dual coil that is 2 ohms will have 2 4ohms coils in it. yes you divide by half. At least that's what I remember seeing. I'll have to check tomorrow on a couple of dual coils that I got. Never used them so it's an uneducated guess.

 

[iamtumus]

yes, a 2 ohm dual coil is really 2 4 ohm coils.

 

[windozehater]

No matter how many coils of whatever resistance in whatever configuration, if at the end of the circuit it reads a certain resistance that is your final ohms, but as mentioned before subtract that from your meters' reading with the probes touching. the only time you need to know the number of and resistance of each coil is if your setting up multiples from scratch or doing a repair then its nessesary, for calculating your overall or end resistance. On a side note, 4.2ohms holy cow, start with jumper cables and a truck battery

 

[ZW99GT]

If one of your 4 ohm coils inside is damaged, that will cause the overall reading to become 4ohms instead of 2 like it's supposed to be. Are they new?

 

[rik701]

Sounds like one of the coils is blown. It should read 2 ohms because the coils are wired in parallel to reduce the overall ohms of the carto.

 

[SissySpike]

I agree with the last two post 4ohm is very high for a dual coil sounds like they are single coil or one coil is not working. Now you know why they were free.

 

[tnt56]

Sounds like one of the coils is blown. It should read 2 ohms because the coils are wired in parallel to reduce the overall ohms of the carto.

Parallel!!!!!!!!!!! That's the word I was trying to think of.