The table and graphs are pretty self-explanatory if you understand how temperature-controlled devices work.
If not, time to catch up with the threads that try to explain it. The (very short) explanation could be:
A VW mod regulates the voltage applied to the atomizer so it fits the power (wattage) asked by the user, with the well know relationship P = V²/R.
A TC-enabled mod is just the latter, but with some logic controlled module to measure the resistance both to maintain power and temperature. There are several possibilities: to not go beyond a certain temperature, to maintain that temperature, and with several algorithms to detect how fast the temperature is growing up and act accordingly.
The measured resistance is useful to measure mean temperatures in the atomizer coil, because with other metal or alloys than nicrom and kanthal, resistivity does vary with temperature. And for these tables, I've plotted some examples. The variation usually is adjusted to a linear equation, the ones over the table, where the parameter B is the so-called TCR (Temperature Coefficient for Resistance), which is the changed parameter when the user changes from NI-mode to Ti-mode, or the one you can fine tune or set-up in certain mods.
Once the room temperature (20ºC/68ºF) resistance is calibrated -locked, fixed on the mod memories somehow-, which is R0 on the next graphs and tables, the mod uses those equations to know temperatures from resistances, or maximum allowed resistance as function of the temperature setting entered by the user.
Happy hunting of the hideous R/R0 value!.....
The spreadsheet used for doing all this.
If not, time to catch up with the threads that try to explain it. The (very short) explanation could be:
A VW mod regulates the voltage applied to the atomizer so it fits the power (wattage) asked by the user, with the well know relationship P = V²/R.
A TC-enabled mod is just the latter, but with some logic controlled module to measure the resistance both to maintain power and temperature. There are several possibilities: to not go beyond a certain temperature, to maintain that temperature, and with several algorithms to detect how fast the temperature is growing up and act accordingly.
The measured resistance is useful to measure mean temperatures in the atomizer coil, because with other metal or alloys than nicrom and kanthal, resistivity does vary with temperature. And for these tables, I've plotted some examples. The variation usually is adjusted to a linear equation, the ones over the table, where the parameter B is the so-called TCR (Temperature Coefficient for Resistance), which is the changed parameter when the user changes from NI-mode to Ti-mode, or the one you can fine tune or set-up in certain mods.
Once the room temperature (20ºC/68ºF) resistance is calibrated -locked, fixed on the mod memories somehow-, which is R0 on the next graphs and tables, the mod uses those equations to know temperatures from resistances, or maximum allowed resistance as function of the temperature setting entered by the user.
Happy hunting of the hideous R/R0 value!.....
The spreadsheet used for doing all this.
