EPT = Electrical Ping Timing
It is a method of temperature control that adds data packet pings through the coil in addition to the traditional pulse TCR delta ohms method employed in the majority of devices. Apparently the speed by which a wire can transmit the data packet pings changes very predictably with the temperature of the material in the coil. The timing of the pings is then used to verify the traditional TCR method for a more accurate calibration of operating temperature. It is especially effective on materials like NiCr & Kanthal where the TCR is so low that accurate TCR TC becomes impossible using the traditional method.
This is the method that Hohmtech employs in the FSK chips it uses in the HohmwreckerG2 & Slice mods. Hohmtech actually uses the traditional TCR Resistance Change, EPT, and a Parallel coil mounted on the board itself called the side coil and compares the values from all three in the board to determine coil temperature. I can tell you that it does work with kanthal & nichrome very well & is awesome with claptons & complex coil configurations that dna cannot TC but is entirely too dependent upon the users belief on what they think the temperature of the vape is to calibrate it. Essentially I think Hohmtech did a poor implementation because it is impossible for an inexperienced user to know the actual temperature, but I understand why they did it that way. It is just so counter intuitive to have a mod that can determine the temperature change of a coil so incredibly accurately, yet simultaneously have no Idea if the temperature you have the mod set at is even close to what it is actually operating at other than I think its right. The irony of the concept of the calibration method they employed is absurd but they do work to make it more realistic with each successive firmware update & have made great strides and the newer Auto + TC Kanthal mode now drops you reasonably close on the TC Curve.
I've long hoped Evolv could add the capability to the dna chips in a better implementation than Hohmtech used because I believe a FSK Chip can actually be dangerous in inexperienced hands, and I think Evolv can employ the technology in a much better implementation.
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