temp control mode keeps switching back to power mode.
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That was one of the first things I did. Rebuilt the coils and cleaned the posts, and rebuilt it on a different rda. I thought it was my mod that was bad (mini vtc) but it had the same symptoms when I tried it on my cuboid. But as of now its working fine on one coil at around .50 ohms on both mods.
Just ran into this issue with my Presa 100 tc/Avocado24 combo.
Took off the tank. Re-set the mod back to SS, unlocked resistance, put tank back on and locked resistance.
Working fine again. YMMV.
Took off the tank. Re-set the mod back to SS, unlocked resistance, put tank back on and locked resistance.
Working fine again. YMMV.
Srry to last poster on first page. Didn't see your post 'till after posting mine^^^^^.
Your name is a bchit to spell btw. haha. Cheers.
Your name is a bchit to spell btw. haha. Cheers.
That's not entirely the case. As you vape, the coil will heat. Temp control is basically comparing the change in resistance (from base) to calculate the temperature. A .5 ohm coil that has been used for a couple of toots is not .5 ohms anymore. It could be .6 or higher. By locking the resistance, you're telling the chip what the base resistance should be and the difference is due to the heat still in the coil. This allows it to predict the correct voltage it will need to reach and maintain the temperature you've set.
If you want to see what happens when the mod simply uses what resistance it finds, check the djlsbvapes youtube channel for the Sigelei 213 and see his temp control tests. The mod didn't lock in the resistance and read a new resistance every time it fired. Because of this, after three or more hits, its base resistance rose high enough that it got hot enough to burn cotton even though the temperature was set below 300 degrees Fahrenheit.
This example is also why, even on my SXM M Class, I will re-lock if the device has sat for long periods where ambient conditions may make changes.
i.e. Air Conditioned room over night. A Mod set up under warm conditions would not properly heat coil to temp set.(cool/cold vape)
That is incorrect. It is correct that heating the coil alters the resistance and that is how the chip determines the temperature, but, the chip gets it initial reading the first time the device is activated. This again is why it is important to get an accurate initial reading. Once the chip gets it's initial reading it should not change, hence, there should be no need to lock the resistance. The display of whatever mod you are using should not be displaying the resistance fluctuations it needs to determine the temperature, it should only be displaying the initial resistance it read.
If the resistance is fluctuating then it is a sign that something is wrong. Locking the resistance is forcing the device to fire a coil that is not working properly.
I totally agree with you. Unfortunately, the most mods aren't smart enough to understand that.
errr...
Actually you HAVE to lock the resistance at room temperature, otherwise the TC will not handle your coil properly at all, the moment that you vaped, the coil is heated and the resistance value is NOT the same anymore.
Not locking the Ohm, you're pretty much defeating the TC feature.
Considering that every TC mod I've used, read about, looked at, have the lock feature and the instructions clearly states to use it...
I'll just put my trust with them (and the many others that explains the "why" you have to lock your resistance) over an anonymous person on the internet....
Huh? I have been using TC since it came out and I have NEVER locked my resistance and my resistance doesn't change, unless something is wrong with the coil. Something I wouldn't have seen if I had locked my resistance. Why would you lock your resistance at room temperature? If I connect my SS coil I just built that I know is .5Ω and my mod reads it at .5Ω, why would I, why would anyone, need lock it in? If the coil is connected properly and fires properly it will continue to be .5Ω without locking the resistance in.
Resistance lock was a fix for a problem that didn't exist. The need for it came from peoples inability to build (and connect) proper Ni coils. It was new to us back then and we were learning as we went. Not to mention they started us off with the worst, most finicky, wire possible in Ni. China just copied it from there and now it is commonplace, but still completely unnecessary.
If any mod makes you lock the resistance, I wouldn't use that mod. It should be smart enough to keep the correct resistance itself and only fluctuate when something is wrong.
wow.. you really absolutely don't understand how resistance and metals works I see.
I'll make a note that you're another of the "experts" on here that people need to ignore, even fear the advice that you give.
From the Evolv website, the ones who brought us TC. Please show where it says you have to use resistance lock. I figure we might as well go straight to the most knowledgeable source from the get go...right.
DNA 200 instructions:
Resistance lock: The DNA 200 relies on the cold resistance of the atomizer to measure temperature accurately. If the connection is not stable or if you find the measured resistance drifts with time, it may be desirable to lock the atomizer resistance. To do so, while locked hold both the Fire and Up buttons for two seconds to enter Resistance Lock mode. In this mode, the DNA 200 will use the present atomizer cold resistance without refinement until the atomizer is disconnected or the resistance lock is disabled.A lock symbol will replace the ohm symbol on the display. To disable resistance lock, repeat the procedure to lock it.
I think you should read up a bit more on the subject.
Also, I am not metallurgist, but I do have a basic understanding of how all this works. Mod heat coil, coil gets hot, resistance in metal rises as it heats, chip calculates resistance rise to determine temp of coil.
That said, NONE of that has to do with locking your resistance in. When you lock the resistance, YOU are telling the chip what the coil should remain at instead of letting the chip do it for itself. The chip doesn't need you to lock the resistance to do TC.
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I have an original DNA40 that doesn't and a newer one that does. I am not sure where Imfallen is getting his info that resistance lock is somehow required for TC, but I think he has seen the error in his ways. I hope so at least.
Start here for a quick crash course:
Electrical resistivity and conductivity - Wikipedia, the free encyclopedia
Then here:
Temperature effects on resistance
and here
Temperature Coefficient of Resistance
If you still don't understand it after than, simply stay away from metal and electricity, it'll be safer.
If you do reply after this, I respectfully expect that you'd go with a wannabee "witty" reply to show how smart you believe yourself to be, or will you repeat your previous behavior and go to a single biased and limited source for counterpoint and not be able to provide any valid references when asked for clarification to your claims. This is not an insult, just a observation of how you behaved in another thread and I'm hoping that you might be able to be over that.
I gather that you lack the ability to conceive that me typing the very same information by hand from what I know, 1) would be a waste of my time, 2) would be the same information as per these links.
As some point, I understand that you might have difficulties in understanding some things, but the information about metal, resistance, temperature, is quite constant.
I'll try with a simple example using simple words as your reply implies that the links I provided contained information that were simply too difficult for your comprehension.
When one makes a coil, place it on a tester (for example) and does a reading of it's resistance, they will obtain a specific number at room temperature. If they fire the coil, even just a little bit, the coil gets hot, and the resistance, if retested before it cools down, will be higher.
With Temp. Control, as per what some other gents have already explained, is that using a varying measurement as the coil is under usage, creates a situation where the sensor, utilizing the resistance read from the coil at the moment, estimates the temperature of the coil and makes that magical thing that "controls" the power provided to the coil so it does not go higher than the set temperature. If the resistance is not locked, it can still estimate to an extent by the variant in resistance at the moment, but at this point, the temperature of the coil is already higher than room temperature, which creates a distorted temperature estimate.
So instead of maintaining a set temperature, this results in a variance of resistance control approach, which can create a situation that with chain vaping, the temperature will be increased and not accurate.
I'm certain that some mods may have an approach to consider such an approach, but it is a much simpler, more accurate, and cleaner approach to simply lock the resistance.
Anyways, with this, I'm done with this thread.
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