Is it generally ok for a mod to read the wrong ohms if it's just a few decimal points off?

Status
Not open for further replies.

englishmick

Vaping Master
ECF Veteran
Verified Member
Sep 25, 2014
6,520
35,485
Naptown, Indiana
Don't know your hardware and I don't use low res coils, but here are some thoughts.

Firstly that difference of 0.04 is a very low number of ohms to try to read. And premade coils tend not to come with super precise ohms. Then you would need perfect conduction between the coil and whatever part of the mod reads the resistance in order to read .15, assuming that's exactly what the coil resistance is. With such low numbers it would only take a slightly bad connection somewhere in the loop to throw it off.

Don't think you have much to worry about.
 

pvarck31

Senior Member
ECF Veteran
Sep 9, 2017
119
234
45
The Land
Thanks guys. I've actually been vaping for about 3 years (wouldn't know it with my silly questions) But this is the first time I can recall the resistance being off by more than .1 or 2. Especially with the .15 coils I used from Smok. They seem to read pretty accurately. But I just got the Charon Mini and just put in on the Baby Prince so yeah I was a little thrown off.
 
  • Like
Reactions: stols001

93gc40

Vaping Master
ECF Veteran
Oct 5, 2014
3,461
2,663
California
When you say wrong ohm are you comparing the mids read to the factory spec or the reading you get from an ohm meter.... factory coils can be off by as at least 5 to 10% even more. A few 100th of an ohm is normal. Can be deference between fresh and broke in coil. Don't worry so much about an 'incorrect' reading but do worry if the reading changes. once burned in the coil should maintain a pretty stable COLD reading. At whatever rate it settles at.



Sent from my SCH-I605 using Tapatalk
 
  • Agree
Reactions: stols001

stols001

Moved On
ECF Veteran
May 30, 2017
29,338
108,119
No it's totally fine. I have a few mods just consistently read coils high, but since it's consistent, I just let my mod do its thing and vape myself to the right wattage for the coil. I don't think any mods other than maybe some DNA mods are ultraprecise anyway.

Could equally be you are noticing inter-coil variances that your smok mod was not picking up on due to its (likely) lower end of the accuracy spectrum.

But, this is not something you need to worry about especially on a regulated mod.

Anna
 

stols001

Moved On
ECF Veteran
May 30, 2017
29,338
108,119
Yeah, maybe only if you really know what you are doing. Some of us don't have that issue. LOL. I mean, actually where you really really don't want lack of precision is on a mech.

I find precision to be something of a moving target, in the sense that I keep chasing it, and it keeps scuttling away, but I'm trying I swear to God.

Anna
 

Myk

Vaping Master
ECF Veteran
Jan 1, 2009
4,889
10,658
IL, USA
Yeah, maybe only if you really know what you are doing. Some of us don't have that issue. LOL. I mean, actually where you really really don't want lack of precision is on a mech.

I find precision to be something of a moving target, in the sense that I keep chasing it, and it keeps scuttling away, but I'm trying I swear to God.

Anna

Definitely a moving target when talking about TC because of ambient temperature changes. IMO every TC mod should show ohms to 3 digits AND allow you to manually adjust. The precision required to predict the changes in the coil is too much for poor connections, internal resistances and changing temperatures.

I had a TC mod that was one of those that always read high. Bad TC if you went with its reading. Good if it was manipulated to lock in right (and now that I've found Arctic Fox hopefully once I do some repairs it will live again and be easier to set up).
 

Topwater Elvis

Vaping Master
ECF Veteran
Dec 26, 2012
7,116
16,502
Texas
Except in TC, then thousandths off can be an issue.

The OP asked about a smok baby prince tank using a .15Ω head, it uses the same replacements heads as the TFV8 baby beast, none of which are TC compatible.
As far as the OP's question, .04Ω variance in a stock replaceable head is nothing to be concerned with, at all.

The OP never mentioned TC & none of the heads are TC compatible...
 
Last edited:

Myk

Vaping Master
ECF Veteran
Jan 1, 2009
4,889
10,658
IL, USA
The OP asked about a smok baby prince tank using a .15Ω head, it useless the same replacements heads as the TFV8 baby beast, none of which are TC compatible.
As far as the OP's question, .04Ω variance in a stock replaceable head is nothing to be concerned with, at all.

The OP never mentioned TC & none of the heads are TC compatible...

I agree. Just throwing in some additional information in case the OP decides to try TC at some point and thinks a bad reading is close enough because it was OK before.
 

suprtrkr

ECF Guru
ECF Veteran
Verified Member
Jun 22, 2014
10,410
15,048
Cowtown, USA. Where the West begins.
No worries. The meters in mods are not that accurate-- a milliohm meter accurate to hundredths of an ohm costs a few hundred bucks-- and the resistance of the coil will change that much just from ambient air temperature.
 

Myk

Vaping Master
ECF Veteran
Jan 1, 2009
4,889
10,658
IL, USA
No worries. The meters in mods are not that accurate-- a milliohm meter accurate to hundredths of an ohm costs a few hundred bucks-- and the resistance of the coil will change that much just from ambient air temperature.

And then there's mods that read as soon as there's contact but not good contact.
 

93gc40

Vaping Master
ECF Veteran
Oct 5, 2014
3,461
2,663
California
If the incorrect metered reading are consistent.... Ie the error ratevisvrepeatable... then TC function is likely to be unaffected.. Temperature accuracy maybe off. But then none of us KNOW how accurate our mods are because I doubt many have verified accuracy with a thermometer. We just trust the algorithm.

Sent from my SCH-I605 using Tapatalk
 

UlkaHuren

Senior Member
ECF Veteran
Jul 29, 2018
150
303
Central Maryland
I have a Smoant Charon Mini ( I said 2 before, duh) and a baby prince tank with a .15 mesh coil in it and I can't get it to read any lower than .19. Could this cause any issues? If so is there anything I can do about it?

Thanks

It's generally not an issue. I generally have no problem if the resistance is off by a couple of hundredths of an ohm or so. Usually if the resistance is higher than that it's caused by added resistance in the tank. I had a new tank that added around 0.04Ω and it would jump around. That IS always a problem! If the resistance jumps around, then you get hot spikes. I had to tear the tank apart and polish the 510 screw contact threads and the hole by putting rouge on the threads and tightening and loosening the screw many times and then clean the grit out of the threads. Done that more than once. I use TC mode so my spec of resistance variances of no more than 0.002Ω is mandatory.
 
  • Like
Reactions: stols001
Status
Not open for further replies.

Users who are viewing this thread