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There is a nifty little app for heat coefficient microcoil pro £2.38p
link: below from suck my mod. forward to 9 min 15 sec
Interesting vid It`s just my opinion but I think a lot of reviewers put too much faith in the displayed temperature. I`d have liked to have seen that EHPRO mod maybe taken down to 370/380 and tried again. I would have the same issue with the IPV4 if I didn`t change my displayed burn reference down to about 320F. It`s working perfectly there. I wish there was a temperature measuring device that didn`t break the bank
It seems you can adjust said 'co-efficiency' as well as the temperature... could be interesting
You can adjust the coefficient of resistance for different wire..as opposed to most being pre set for NI200...never used it and know no more.
Calling VapingBad as I think he has looked into more for the DNA200.
The Temperature Coefficient of Resistance (TCR) is the rate the resistance changes with temperature, normally a number for the proportion fo change per degree based at 20 C. This is good enough for most wire, but some materials a single number is not accurate enough (I think this is due to expansion under heat also affecting the resistance). With wires like stainless steel and titanium you need to be careful you have the right grade of alloy for your TCR as it varies a lot between grades. In practical terms you would be fine with the right TCR for around the temp you vape at, but some mods like the Decodes and the DNA200 have more accurate way of doing it. You can combine several wires and get a composite TCR on SteamEngine for the DNA200 so mixed wire fancy coils can be temp limited now. The DNA uses a graph for TCR that you can edit in EScribe (DNA200 windows app), but it really meant for people selling wire to provide these that you can upload to your device.
The DNA200 also has a diagnostic program to plot how your mod dissipates heat and I suggested a feature that will measure the mods resistance from the software when you short the 510 and John said "Not a bad idea am making a note of it". The last time he said that to me the feature went in the beta fw the next day and went live 2 days later, so I am optimistic it will get in. So the chip will be able to compensate for more things than just the TCR, if you buy a mod the maker should have set all this up before shipping so you don't need to do it unless you are making it yourself.