Smok xPro M65 - Weird Voltage Increase/Drop

[Remko]

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smok xPro M65 - Weird Voltage Increase/Drop[/h]

Hello,

I've set my smok xPro M65 with my Kayfun V4 on 15 watts at 0.8 ohm. However, the volts are changing frequently on vaping. Ohm and Watts stay the same just sometimes on vape the volts display 3.4v, the next time its showing 3.6v and changing etc ... its weird because ohm and watts are the same .. just volts change .. what may cause this ?

Kind Regards.​

 

[State O' Flux]

For the M65, as I don't have one, I'm not exactly sure if your real time voltage is displayed during a draw, but... I'll toss out an educated guess, based on that possibility.

Using a very basic but handy on-line Ohm's law calculator - if your chipset uses standard Ohm's law formuli as your program constants, along with your preferred wattage and net resistance values - your voltage, at 0.80Ω exactly, would be 3.46v.

If your resistance measurements are not exact, but "rounded off" (or coil temperature raises resistance a sufficient amount) - more somewhere between 0.8Ω and 0.9Ω - you only need a net resistance of 0.86Ω+/- to reach 3.6 volts.

Toss in variables like chipset accuracy, quality of continuity at the 510 connection and draw time... it'd be very easy to imagine your voltage, if it's a real time display, showing a variance.

 

[Remko]

Yeah, upon pressing the fire button different times I can see mostly different voltage displayed. First --> 3.4v, next time I press it it's showing 3.6v and it changes like that. So it's normal or possibly the voltage regulator could be bugged ?
Also, if the resistance is changed to 0.86 then I believe the mod will change it to 0.9 but in my case only volts are changing and the watts+ohms stays the same...

Info: M65 is showing the voltage on each press of the fire button. I am not sure if you call that real time or not but its showing it everytime the button is pressed to vape. It's only on pressing the button but not really real time during the duration of the vape.

 

[Ripshod]

I consider it normal these days.

When I first saw it I thought it was some kind of preheat and left it at that. Now, however, I believe it is a 'live' reading that changes as the regulation adapts to the changing resistance of the coil as it heats and cools.

I'm not naive enough to watch myself in a mirror as I vape, so the above can only be considered an assumption.

 

[Ronald3638]

I had the problem where the resistance on the K4 was changing.

I stretched out the spring and it still was changing then I noticed the 510 pin on the K4 wasn't screwed in tight and after tightening it I haven't had any problems.

This is on the Smok XPro M50 with the 65 watt upgrade.