SXmini M Class (TEMP CONTROL)

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tc1

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Why would the base resistance change? If it is one foot of 28 Ga Ni200 it will be 0.3778 at room temp (whatever you consider that to be in this case 68F) it will always be 0.3778 at room temperature. Why would you continually have to diddle with the value you already know?


Base resistance over time will change as the wire ages and you get buildup on the coil.
 

retird

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I've checked yihi's site and can't find any manual, tutorial, or any how to videos on the sx350j. .. could someone point me to such Yihi info ... all the info here in the thread is good but I can't even determine if the board does any refinement, is capable of auxiliary switches, has a balancing usb charging circuit, warranty info, and etc. etc. I'd like to look at actual documentation if anybody can share it.... thx
 

tc1

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I don't think it's the gunk, I think it's just the constant temp swings and some mild ablation physically changing the wire, along with oxidation on the connector side of the circuit increasing resistance. The gunk on the coils is just an indicator of use, not the cause.

Then why does dry burning the gunk off the coils cause the base resistance to drop back down? Electrons flow through the surface of the coil. When something is covering the surface of the coil, it adds resistance.
 

tchavei

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You never experienced this? :?: It happens to every atomizer I've had or used for the 6+ or so years I've been vaping. Gunked coils generally equates to increased resistance.

Sorry. Never happen... Ever and I had the same coil for over 4 months.

Even Dr. G agrees with me:

Well, if it didn't, then it would expose more elemental titanium, which would then oxidize, and the resistance of the wire would increase. Yet I've run titanium coils for months of daily use with NO change in base resistance seen by the DNA40. Can you say the same about nickel? I don't know 'cause I've never ruin a nickel coil long enough to see whether its resistance changes. Some coil materials certainly increase in resistance over time; this was quite obvious with some cartos, but I'm not sure what those coils were made of.

Anyway, nickel also forms a protective oxide layer (and nickel oxide is considerably less benign that titanium dioxide). So does the nickel oxide stay put on the nickel wire?

I can, I have months-old nickel coils in some of my atomizers

So...?

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Tony

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tc1

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I'm actually stunned that we are even talking about it. lol

I thought it was common knowledge that as a wire ages and gets gunked up the resistance increases. That was the WHOLE point of dry burning back in the day. When we were using fixed voltage devices if we didn't dry burn our coils, eventually the resistance would build up to the point that you would hardly produce any vapor.

I'm not calling you a liar by any means... I'm just shocked that someone is saying they've never experienced it.

I mean heck, even on my mechanical setups. If I don't dry burn my coils or replace them from time to time ... my vapor production will begin to suffer.
 
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tchavei

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I'm actually stunned that we are even talking about it. lol

I thought it was common knowledge that as a wire ages and gets gunked up the resistance increases. That was the WHOLE point of dry burning back in the day. When we were using fixed voltage devices if we didn't dry burn our coils, eventually the resistance would build up to the point that you would hardly produce any vapor.

I'm not calling you a liar by any means... I'm just shocked that someone is saying they've never experienced it.
Gunk works as a heat insulator. That's probably why you see less vapor production.

I never had a resistance change due to build up. As you can see by my quotes, neither has Dr g. or Rossum for any reason. All three lying (is that's how it's spelled?) would be a conspiracy...

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Tony

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HolmanGT

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I'm actually stunned that we are even talking about it. lol

I thought it was common knowledge that as a wire ages and gets gunked up the resistance increases. That was the WHOLE point of dry burning back in the day. When we were using fixed voltage devices if we didn't dry burn our coils, eventually the resistance would build up to the point that you would hardly produce any vapor.

I'm not calling you a liar by any means... I'm just shocked that someone is saying they've never experienced it.

I mean heck, even on my mechanical setups. If I don't dry burn my coils or replace them from time to time ... my vapor production will begin to suffer.

tc1,

Does that mean that insulated wire has a higher resistance than bare wire?
 

tchavei

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I mean hell, I just replaced the nickle build on my Goblin 2 days ago because my coils were gunked all to heck. The resistance had bumped up 0.03 ohms since it was new.
That's not build up that's something else :)

Regards
Tony

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DDramaSV

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Possibly but what I have found with the DNA40 is the refinement doesn't correct for 510, post screws or build connection problems. If its a bad connection it will remain bad until resolved regardless of refinement mode. I actually appreciate the simplicity of the U-set-it base resistance approach. If I put a different atty on then I know to reset it. If it's been sitting unused or got cold or hot then I know to reset it. It's the one thing I missed on the 40, an operator button press base resistance reset. I always had to trick it into resetting. For me this is much simpler. If it's not vaping right or not displaying a resistance I know it should be close to, then I start looking for connection problems. Whereas on the 40 it would stop displaying temperature and display volts. What would be interesting is if this doesn't drop out of Joules mode with a Kanthal build or bad connection atty. I'll have to try that...

My DNA 40 seems to have problems accurately reading dual coils below .1 ohms although it wasn't necessarily designed to do so. Where my SX will read them very close to what the calculated build should be. I have noticed that they read within .02 of each other for most builds once you drop any where under .1 though my DNA will read it as .1 and then refine to .09! As far as the bad connections go I haven't had my VS pop out of TP even with a bad connection and I've had to figure it out through trial and error!
 

tc1

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tc1,

Does that mean that insulated wire has a higher resistance than bare wire?


Insulated wire uses a non-conductive insulation ... so no.
Gunk on a atomizer coil is still conductive and electrons WILL flow through it (at a greater resistance).

If you take nickle wire and wrap something like say ... nichrome ... around parts of the nickle wire. You will add resistance to the coil. Because again, the nichrome IS conductive but it will add increased resistance.
 

HolmanGT

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I mean hell, I just replaced the nickle build on my Goblin 2 days ago because my coils were gunked all to heck. The resistance had bumped up 0.03 ohms since it was new.

I don't believe that was gunk that caused that but "Auto Refinement" sure would. Like I said insulated wire doesn't have more resistance than bare wire.
 
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