Smok xPro M65 - Weird Voltage Increase/Drop

[Remko]

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.

 

[Ou2mame]

Could be a faulty voltage regulator, or other interference causing it to shift. My mvp does that sometimes, it'll read 3.8 or 4 volts at 1.5 ohm with 12.5 watts. I'm guessing it's just internal abnormalities.

 

[Remko]

Yup, its changing frequently from 3.4v to 3.6v after that back to 3.5v and etc. It's weird and there must be explanation about that. So, its probably the voltage regulator that it's faulty and I should return it to the store?

 

[Ou2mame]

I would want to try the same tank on another unit and see if you get the same results

 

[Remko]

I would want to try the same tank on another unit and see if you get the same results

On iStick 30Watts I get 0.8 ohm and constantly 3.4v, no changes there but its not reading the voltage upon pressing the fire button, so that could be why I cant spot it on it too ..

So, any reasonable explanation about the volts changes?

 

[Dougiestyle]

Yup, its changing frequently from 3.4v to 3.6v after that back to 3.5v and etc. It's weird and there must be explanation about that. So, its probably the voltage regulator that it's faulty and I should return it to the store?

Aside from the observation of the variance in the displayed output, does the unit produce satisfactory vapor? I have the Xpro M65, and I think it does the same thing as yours. The vapor is constant, though. The display isn't visible when you have the topper to your mouth while inhaling, anyway. What I'm getting at is, why would you consider returning it if it's performing its intended function?

The observation of a slight (.2) voltage variation isn't even something that I think I could perceive through sensory perception. Really, when/if my M65 has the same occurrence as yours, I don't notice.

As long as you can get a satisfying vape from the unit, regardless of the number variance, I don't think there's any reason to return it. It's doing what it's supposed to, right?

 

[Remko]

Aside from the observation of the variance in the displayed output, does the unit produce satisfactory vapor? I have the Xpro M65, and I think it does the same thing as yours. The vapor is constant, though. The display isn't visible when you have the topper to your mouth while inhaling, anyway. What I'm getting at is, why would you consider returning it if it's performing its intended function?

The observation of a slight (.2) voltage variation isn't even something that I think I could perceive through sensory perception. Really, when/if my M65 has the same occurrence as yours, I don't notice.

As long as you can get a satisfying vape from the unit, regardless of the number variance, I don't think there's any reason to return it. It's doing what it's supposed to, right?

That's the issue, I believe the vapour changes with this increase/decrease of the voltage. Not sure yet as I am still testing it out.

I mean, could you really see if it does the same to you too? I mean increasing/decreasing the voltage even when the ohm and watts are the same?

Kind Regards.

 

[Dougiestyle]

I think I figured out the reason for the display variance in operation. With voltage regulation limited to x.1 and wattage being variable to xx.1, the regulation is varying the voltage because the setting calls for x.x1 variance. On mine at .9ohm and 32.5W the voltage bumps 5.5-5.6 fairly rapidly. It's not the "rattlesnake" effect like PWM, but a constant miniscule change to attain the watts setting for the resistance supplied. It's not faulty. it's doing the job it's being asked to do. It looks wonky, but is really as accurate as can be with the variables. Try adjusting your wattage setting up or down and see if the variance speed decreases or even holds steady when the regulation finds a whole median

 

[roxynoodle]

I think I figured out the reason for the display variance in operation. With voltage regulation limited to x.1 and wattage being variable to xx.1, the regulation is varying the voltage because the setting calls for x.x1 variance. On mine at .9ohm and 32.5W the voltage bumps 5.5-5.6 fairly rapidly. It's not the "rattlesnake" effect like PWM, but a constant miniscule change to attain the watts setting for the resistance supplied. It's not faulty. it's doing the job it's being asked to do. It looks wonky, but is really as accurate as can be with the variables. Try adjusting your wattage setting up or down and see if the variance speed decreases or even holds steady when the regulation finds a whole median

That's normal. Coils change from heating and cooling.

The OP's might not be right. I would notice a 0.2V change in my vape.

 

[Dougiestyle]

PWM regulators do it and it not noticable. I'm talking .2V variance twice per second. Maybe it holds on the high side for slightly longer (.75sec) to produce the wattage setting, but during the course of the variance, the wattage output is accurate to the user's setting.

30W setting with a .5ohm coil requires 3.8729833462V by Ohm's law. The circuit can only show 3.8V or 3.9V, so for a portion of a second it will hold @ 3.9 to produce the .0729833462 above 3.8

 

[Remko]

I totally understand that guys, however the volts on mine change from 3.4v to 3.6v after that back to 3.5v and etc. It's not steady at all when Watts and Ohm doesn't change at all. It always display 0.8 ohm and 15 Watts but volts changes frequently with approximately 0.2 +- .. so this is considered normal or probably faulty one ?

 

[Dougiestyle]

30W setting with a .5ohm coil requires 3.8729833462V by Ohm's law. The circuit can only show 3.8V or 3.9V, so for a portion of a second it will hold @ 3.9 to produce the .0729833462 above 3.8

I totally understand that guys, however the volts on mine change from 3.4v to 3.6v after that back to 3.5v and etc. It's not steady at all when Watts and Ohm doesn't change at all. It always display 0.8 ohm and 15 Watts but volts changes frequently with approximately 0.2 +- .. so this is considered normal or probably faulty one ?

the displayed voltage is changing because it's limited to displaying x.x - 2 digits. The wattage setting in relation to the resistance requires x.xx - 3 digits. It's how it does what you're asking it to do. 15W @ .8ohm resistance requires 3.4641016151Volts. Your display will not show that number. It will vary around the number to produce the correct wattage.

Quit looking at the display. You'll burn your liquid without airflow across the coil. If you're looking at the display with the button pressed, you're not inhaling a soothing cloud of peace. Just ignore the display. If you hit the button and inhale and it's not satisfactory, then adjust according to your preference. Don't get caught-up with the blinky numbers. Enjoy the vape.

I'm almost getting suspicious that you just need a technical reason to say the unit is faulty. From your description, it works fine.