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scoopy

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Reply with quote  #16 
Thank you John and James.....u say this makes the mod pretty much exactly accurate then right
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Vape_Like_A_Boss

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Reply with quote  #17 
Quote:
Originally Posted by Brandon
Quote:
John or the other evolv guy that are on the electronic engineering side (sorry Brandon, you're probably good for a few things too lol) will probably have such a good answer, I'll edit whatever turns out to be incorrect.


John, can you reach that knife in my back?  It's in there deep.  [bawl]


Lol sorry Brandon, I had to poke a little fun [smile] John doesn't get to deal with us much, so we have to take a few swings for him.

On a serious note, both of you have truly been inspiring motivation in this industry and honestly made one of the biggest impacts on what we know today as vaping. Neither of you takes the credit you deserve, but there's a lot of us that appreciate the hell out of Evolv as a company, including you two and all of your staff. Brandon you had a vision, and did so much to make it happen. Big thanks to both of you.

While I'm being all sweet, I'm really impressed with the level of customer service and communication that's gone on with the early adoption part of this testing phase. I know several of the non staff had a part in it too here on the forums, but you guys together nailed it. The innovation of the product but also the customer interaction and service you've provided even when we screw up, deserves some big appreciation and respect.

Thanks guys, and sorry OP for the derailment.
Justin

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Reply with quote  #18 
If anyone knows the mod resistance for the Opus 200, that would be extremely useful. I realize it can vary a bit from each device, but a roundabout would be great. Unfortunately I don't have any solid copper or a temp gun around.
ndb

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Reply with quote  #19 
Hey, this is extremely interesting, as fighting static resistances has been my main hobby since when I completely moved to TC last year, so forgive me if I'm nitpicking, but I want to be sure I understand, so here are my 3 Qs related to the quotes below:

Quote:
Originally Posted by John

.
.
All these elements have some resistance, and resistances in series add up. So, you might have

Output wires: .002 ohm
Connector body: .001 ohm
Connector contact resistance: .002 ohm
Atomizer body: .003 ohm
Atomizer contact resistance: .002 ohm
Coil: .10 ohm

So the total resistance would be .108
.
.


QUESTION 1)
Why .108? Wouldn't all the contributors above sum up to .002 + .001 + .002 + .003 + .002 + .10 = .11?
Is it just a typo or is there some reasoning by which not all the contributes have to be considered?

And this brings me straight to

QUESTION 2)
Regardless it being .108 or .11, would it be correct to say that for the _mod_ resistance (i.e. excluding atomizer + coil) I only have to consider
  • output wires
  • connector body
  • connector contact resistance
For a _mod_ resistance of .002 + .001 + .002 = .005?
Maybe this is the reason you suggest to "trim" off the measured shorted-atomizer resistance to about its 80% value?
IOW: we have to shelve off a bit of what we measure short-circuiting the atomizer so that we effectively take only the _pure_ mod static resistance into account?

And now the final question, strictly related to ni200 TCR: 

Quote:
Originally Posted by John

.
.
With nickel 200, a doubling of resistance corresponds to about 412 degrees. 
.
.


QUESTION 3)

If I'm not mistaken, (using the linear approx of the TCR, i.e. dR/R = TCR * dT), given that 412F = 211,11C, this would imply that TCR = 1/211,11 = 0,00473.
But I've always heard something along the lines of "ni200 increases its resistance by about 62% every 100C", which makes it for the TCR = 0,0062 that is usually (at least by me) associated with ni200.
Is this discrepancy due to the fact that you account for the non-linearity (and hence the simple formula above doesn't hold) or has using 0,0062 always been a mistake?
VapingBad

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Reply with quote  #20 
I think John just meant 70 F to 412 F rather than doubles every 400 F, but I would have expected around 68 to 350 F doubles r with TCR of 0.00641.
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Latest versions of EScribe: DNA 200/250DNA 75
Common problems
Havensal

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Reply with quote  #21 
Is the board supposed to tick when analyzing the atomizer?  Is it polling once per second?  I just updated the firmware to 7/29 and this is the first time I noticed it.  I have it the atty shorted to check the mod resistance.
Brandon

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Reply with quote  #22 
Yes, it is polling once per second but I haven't noticed the ticking.  If you drop back to 7/16 firmware are you still getting the ticking in refinement?
John

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Reply with quote  #23 
With a short, a tick isn't that surprising. That's a lot of di/dt


Tomr1088

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Reply with quote  #24 
Noticed something scary that was my mistake. Don't ever accidentally set mod resistance to something high. I accidentally set it to .2 ohm instead of .02. Once I uploaded settings and opened atomizer analyzer it constantly kept pulse firing my ni200 build. Due to sampling the coil for resistance readings it was using way more power. Scary lol
John

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Reply with quote  #25 
Oh. Yeah. Don't do that. You can make it put out 250 watts, easy, from a fully charged battery. It won't hurt the board as such, but you'll basically be pin-balling between various protective features, so the vape won't be any good. 
James

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Reply with quote  #26 
ndb: Yes, the atomizer resistance should not be included in the mod resistance. If it's the only atomizer you use, it doesn't really hurt, but that's a big if...

As far as mod resistance goes, honestly it's much better to leave it at zero than to be guessing. A value higher than what is right can destabilize the temperature protection, especially at low power when it's most useful (the dry case).
scoopy

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Reply with quote  #27 
+1
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BryanC84

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Reply with quote  #28 
Does anyone know what the mod resistance may be for the hcigar vt200?
Droopydroors

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Reply with quote  #29 
I do not see an option for mod resistance?
VapingBad

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Reply with quote  #30 
Quote:
Originally Posted by Droopydroors
I do not see an option for mod resistance?

In Escribe in the Mod tab, Electrical section.

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• I am not employed by nor do I represent Evolv Inc.  All opinions are my own, they are just opinion not fact and can be wrong •

Latest versions of EScribe: DNA 200/250DNA 75
Common problems
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