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One reason might be because there's only so much ROM space so instructions need to be limited.
"if mode = VW then new coil = yes & inquiry = no" takes up space.
Some of these Chinese mods have VERY little ROM space.
I agree, I don't like it either, but it is what it is.
I think - and someone please correct me if I’m wrong- , that even in VW mode, the mod needs to know the actual resistance (at room temperature), in order to calculate the output. According to the formula Voltage= Resistance * Current, the mod will raise (or lower) the current (Amps) if the resistance changes. I suppose you build your own coils, with the same wire and the same number of wraps, or you buy them, also with the same wire and nb of wraps every time. In both cases the resistance will be always about the same, maybe with a variation of max 0.02 Ohms, and that’s why it doesn’t make much of a difference if you answer yes or no. But try to install a coil with for example double (or half) the resistance of the previous one, without setting it to this new value, and you will (should) notice the difference.
And there’s another reason the mod is programmed to ask this question: say you vape a few long draws and for some reason you unscrew the atomizer, and reinstall it quickly, while the coil is still warm, and the resistance value will be considerably higher than at room temperature. But this doesn’t mean that you now want this new value as the new base value, it’s still the same as before. in this situation, answering No will leave the setting on its previous value, as it should.
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ok, Let’s say you put in a .15 coil and say yes, it’s a new coil. Now remove that and put in a 1.6 coil and say no, it’s NOT a new coil. The screen will show the ohm as .15 from the previous coil but as soon as you hit fire it’ll change to the correct 1.6. So my point being the mod will do the exact same thing wether you say yes or no. It will not output the volts as if it’s the .15 you said it is. It will adjust the volt to the 1.6 to make the watt setting you selected
None of my 30+ regulated mods would fire the 1.6ohm coil in your example. Instead they'd put out an error message like "check atomizer" or "short".
Is that something you’ve done and this is what happened, or are you asking the question (if that would happen)?
I don’t know, and it might also depend if the resistance is locked (most mod’s software allows you to lock the resistance at the current value, or even set a value manually and lock it). I would think that if it happens to be locked, it might set the wattage (or voltage) to a value based on the old (and incorrect) resistance.
As it happens I’m using a very low resistance coil right now (0.08), but I also have some SS wire laying around, which has a much higher resistance, I might change the coil later today and see what happens if I click ‘No’.
I don’t know, and it might also depend if the resistance is locked (most mod’s software allows you to lock the resistance at the current value, or even set a value manually and lock it). I would think that if it happens to be locked, it might set the wattage (or voltage) to a value based on the old (and incorrect) resistance.
As it happens I’m using a very low resistance coil right now (0.08), but I also have some SS wire laying around, which has a much higher resistance, I might change the coil later today and see what happens if I click ‘No’.
There are instances where I've torched my throat from a dry hit (like last night) where I picked up a kit I had dropped, went to hit it, and the resistance had jumped from 1.2Ω to 2.13Ω. 12.5W for this 1.2Ω coil was a perfect vape. 12.5W for a 2.13Ω coil is not okay. In MTL, Wattage and resistance changes are much more sensitive than they are in DL with high Wattages. Say for example, changing a 0.15Ω coil 10 or so Watts may or may not be able to yield you any noticeable difference. If you change 10W using a 1.8Ω, you just went from no flavor/not vaping, to OMG MY HOUSE IS ON FIRE. Those small changes matter greatly in MTL.
So, to answer your question more directly, you may find that these small changes to be rather annoying, but it matters for MTL vaping.
So, to answer your question more directly, you may find that these small changes to be rather annoying, but it matters for MTL vaping.
The Evolv DNA 200 instructions (page 3) say the following, and attribute the "New Coil?" question to the Temperature Protection logic feature of the board:
" If you are using temperature protection, be careful to only attach new atomizers that have cooled to room temperature. If a new atomizer is attached to the DNA 200 before it has cooled down, the temperature may read and protect incorrectly until the new atomizer cools."
https://downloads.evolvapor.com/dna200.pdf
Working that backwards, you had a couple of questions there, and one was "does it matter?". It does! If the value of change in ohms is too great, the mod's TP logic will assume a problem and not fire. If it's a small amount of change, it'll fire but your TP may not protect as well against dry hits.
These chips aren't really auto-sensing anything. They don't know what type of metal you're using unless you tell them, and they don't know why a change has occurred in ohms unless you tell them. Based on your answers and choices they'll do "smart" or "stupid" things.
You've hit on one of the things that makes temp control (and temp protection) controversial and to some, an annoyance more than a feature.
For me, I like to know that my coils are r going to go above 180c. In some scientific studies, harmful chemical changes occur above that range for certain compounds we commonly use in vape juice. Arguable.
As I've gotten better at making coils and knowing my setups, TC has been annoying. I can make a coil that doesn't go above that temp unless I hold the fire button down for so long that... well I just wouldn't
But for most folks who don't fiddle a lot with coils, answer the questions properly and let the rudimentary logic in the chip do it's thing. Is it really "smart"... sure, but only if I'm smart enough to tell it how to be smart.
Does that help or confuse the situation more? At least, that's what I've understood about the "New Coil?" prompt. It could also just say "Ohms Changed. Recalibrate?" or "I'm going to burn your cotton if you don't tell me what just changed, because I'm not smart enough to know what changed" - but that's a lot of words
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" If you are using temperature protection, be careful to only attach new atomizers that have cooled to room temperature. If a new atomizer is attached to the DNA 200 before it has cooled down, the temperature may read and protect incorrectly until the new atomizer cools."
https://downloads.evolvapor.com/dna200.pdf
Working that backwards, you had a couple of questions there, and one was "does it matter?". It does! If the value of change in ohms is too great, the mod's TP logic will assume a problem and not fire. If it's a small amount of change, it'll fire but your TP may not protect as well against dry hits.
These chips aren't really auto-sensing anything. They don't know what type of metal you're using unless you tell them, and they don't know why a change has occurred in ohms unless you tell them. Based on your answers and choices they'll do "smart" or "stupid" things.
You've hit on one of the things that makes temp control (and temp protection) controversial and to some, an annoyance more than a feature.
For me, I like to know that my coils are r going to go above 180c. In some scientific studies, harmful chemical changes occur above that range for certain compounds we commonly use in vape juice. Arguable.
As I've gotten better at making coils and knowing my setups, TC has been annoying. I can make a coil that doesn't go above that temp unless I hold the fire button down for so long that... well I just wouldn't
But for most folks who don't fiddle a lot with coils, answer the questions properly and let the rudimentary logic in the chip do it's thing. Is it really "smart"... sure, but only if I'm smart enough to tell it how to be smart. Does that help or confuse the situation more? At least, that's what I've understood about the "New Coil?" prompt. It could also just say "Ohms Changed. Recalibrate?" or "I'm going to burn your cotton if you don't tell me what just changed, because I'm not smart enough to know what changed" - but that's a lot of words
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For some reason, my mod also tends to sense a difference in Ohms when it drops, and pops up the ‘New Coil?’ question. Why would that be?
A Couple of Things...
A VV/VW/TC Mod Directly adjusts Output Voltage. Amps change Indirectly as a result of the Changes to Output Voltage.
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When you are in Variable Wattage Mode (or some call it Power Mode), the Vast Majority of Mods Doesn't Know or Care what the Temperature of the Coil is.
All the Mod does when you push the Fire Button is to send a "Handshake" Signal to the coil to find out what the Coil(s) Resistance is. Then it changes the Output Voltage to satisfy the equation => P = V*V / R where P = The Wattage the User sets the Mod to. V = Output Voltage to the Atomizer. R = Resistance of the Atomizer in Ohms.
This happens every time you press the Fire Button.
Asking if there is a "New Coil" in VW Mode is kinda Redundant. Because the Mode Checks the Coil(s) Resistance every time the Fire Button is pressed.
But it might work better in a Mod where the User can jump Back n' Forth between VW and TC Modes on the Fly.
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This is Correct.
0.15 or 1.6 Ohms, Hot verses Cold, New verses Old, none of it really matters when you are in VW Mode. But think about the Last Sentence in the Post Above.
If the Mod knew what the assumed "Room Temperature" Ohm reading was for a Coil(s), because the User was prompted at Atomizer Change and then Save that Ohm Reading, couldn't the User switch between VW and TC Modes and still have TC theoretically perform the same no matter what the Current Temperature of the Coil(s) was/is when the user switched to TC from VW Mode?
Because the discepancy in ohms is way too big and thus the safety features of the mod would kick in. My mods would never change the ohms on their own when I get asked whether it's a new coil or not.
To be exact, I'm not entirely sure. I'm assuming the compression from the drop changes the amount of contact between the battery and coil via the 510 which throws off the resistance reading. Simply unscrewing and reattaching the tank has fixed it in 99% of these cases.
Yes, as long as the software of your mod has the ability to save this value (Coil resistance at room temperature). As I have just discovered, on my Arctic Fox version, I can only lock the resistance value in TC mode, but not in VW mode. So whenever I switch between these modes (which happens very rarely), I have to wait a little bit until TC is working correctly again. Mind you, it doesn’t take long even if the atomizer is quite warm. A minute or two is about enough.
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