TC beyond Ni200: Nickel Purity, Dicodes; Ti, SS, Resistherm NiFe30; Coefficient of Resistance

[TheBloke]

With regulated mods the resistance doesn't matter. Wattage and battery charge determine amp draw (lower charge = higher drain). So the Dicodes should limit the wattage (never actually reaching 80w) and not put a cap on the resistance. Does it really cap the resistance and not limit the wattage?

Sent from my C6903 using Tapatalk

It never soft limits the power, it requires you to do it (I suppose on the basis of not wanting you to think it's delivering power it is not.)

The error messages are in the form of "Low Resistance" and "High Resistance" - so if your current resistance and wattage settings will cause it to go over 15A, it will error "Low Resistance" which means you need to decrease the power.

So it is as you said, it limits the maximum wattage - but by stopping you firing it until you fix it. But it reports that in terms of the coil resistance being too low ("Low Res" error message) for the selected power, rather than the selected power being too high for the coil resistance.

0.4Ω is the minimum resistance at which you can fire the mod's maximum 80W. If you have for example 0.2Ω, you will get Low Res error if you try to fire more than 40W.

 

[tchavei]

So... Did you have time to take some dna temperature measurements or did you just go to bed and left me hanging until 4:30 am?

Regards
Tony

Sent from my keyboard through my phone or something like that.

 

[TheBloke]

So... Did you have time to take some dna temperature measurements or did you just go to bed and left me hanging until 4:30 am?

I fell asleep

@tchavei that dinner did in fact turn out to be too much for me. No probing last night. But will be some today

You are always up until 4.30am, so

PM me your IM details if you want, then you can know if I'm awake

Anyway I'll be doing some testing starting in about 1.5 hours, 20.30 my time.

 

[tchavei]

I fell asleep



You are always up until 4.30am, so [emoji14]

PM me your IM details if you want, then you can know if I'm awake

Anyway I'll be doing some testing starting in about 1.5 hours, 20.30 my time.

Bloke, Portugal and UK are on the same 0+GMT

Your time, my time

Just need to give the kids a bath and feed them and I'll be back



Regards
Tony

Sent from my keyboard through my phone or something like that.

 

[TheBloke]

Nice. I'll shoot him a request. Thanks

Did you get anywhere with Greek Mods, @SavePaperVapor ? @HolmanGT is also looking to buy one from the US.

 

[xpen]

Bloke, Portugal and UK are on the same 0+GMT

Your time, my time

Just need to give the kids a bath and feed them and I'll be back



Regards
Tony

Sent from my keyboard through my phone or something like that.

I'm the one off, time wise (+1h), luckily not as much as the friends across the pond..

 

[tchavei]

I'm the one off, time wise (+1h), luckily not as much as the friends across the pond..

Or the other way around. Holman is probably lunching right now although it's 21:00 here and I'm grabbing dinner [emoji14]

Regards
Tony

Sent from my keyboard through my phone or something like that.

 

[xpen]

Nope, compared to you two. And since you both are on GMT, well I'm the odd one [emoji4]

 

[HolmanGT]

Or the other way around. Holman is probably lunching right now although it's 21:00 here and I'm grabbing dinner [emoji14]

Regards
Tony

Sent from my keyboard through my phone or something like that.

Ya-But, that time differential lets me keep track of the guy that never sleeps Tony are you anywhere close to Transylvania.

 

[tchavei]

I guess bloke fell asleep again.

I'm tired, 3 am, I'm going to bed too. Nighty night

Regards
Tony

Sent from my keyboard through my phone or something like that.

 

[TheBloke]

OK Tony @tchavei , you've been a good boy and waited long enough. Here is your first result.

Removed, more accurate results coming

 

[TheBloke]

I guess bloke fell asleep again.

I'm tired, 3 am, I'm going to bed too. Nighty night

Regards
Tony

Sent from my keyboard through my phone or something like that.

Wow talk about bad timing I heard my phone buzz about 3 seconds before I hit Post.

 

[TheBloke]

All right here it is. Background, testing method, data sheet if anyone wants it, and any further explanations will come later after sleep Should be fairly self explanatory in the meantime.

The Titanium used is Zivipf 0.39mm / 29G, already known to have approximate TCR 0.0035. Other Titaniums may vary (but hopefully not too much.)





Caveat: all testing done thus far is on dry coils; I so far assume this is relevant to wet coils / real vapes. But I will be doing further testing to validate that in due course.

 

[TheBloke]

Right, updated. I'll do other mods such as IPV4 and ChiDNA 40 some point soonish.

 

[vapealone]

Hi guys,
I have finished with it for now.

Quick Table of Contents for the worksheet

• Tab ‘ρ(T)’ shows resistance of different materials at temperatures of relevance. Unit:μΩ*m. All the resistances are calculated with certain precision but ρ(20°C) which is input data
• Tab ‘TFR(20°C-T))’ shows Temperature Factors of Resistance of different materials between 20°C and temperature shown . This factor shows you that e.g the shown Titanium’s resistance @ 200°C is 1.635 times bigger than @ 20°C.
• Tab ‘TCR(20°C-T))’ shows Temperature Coefficients of Resistance of different materials between 20°C and temperature shown . Please bear in mind that TCRs are always referring to a range and giving accurate reading by the highest limit only. TCRs between 0°C and temperatures shown are more likely different not to mention the generally used TCR( 0-100°C)
• Tab Ni200, Kanthal Alloys etc shows all the input data acquired and used for the calculations including links to sources.

Disclaimer: IMO the precision of these calculation are above our vaping gears but it is only as accurate as the data I used. Let alone if some careless vaper happens to attach the atomizer or lock the resistance when the room/outdoor temp is either below or above 20°C the figures will be different.
Bottom line: use this figures as a starting point for measurements/tuning/vaping only.​

@TheBloke:

You will love the Ti TCR part The finally found ρ(20°C) values indicates that Specimen #2a is probably the closest match to GR1 (and not 1a as I said before). And its TCR(20°C-T) figures are locking on 0.0035x. And x is either 2 or 3​

@tchavei

I am afraid I will say a pass to any detailed temp offset table. At least for now. However the TFR tab can be a good starting point. E.g. TFR(Ti, 20-200°C )=1.635 is falling between TFR(Ni200, 20-150°C) and TFR(Ni200, 20-155°C) meaning that on a Ni200 optimized mod 150-155°C setting is required which is pretty close to TheBlokes measurement. Especially, that the Ti I was working with isn't GR1 just close to it​

 

[vapealone]

Now, I am angry.
Since I have bought my DNA 40 I lost my faith in Evolv. And I started to doubt everything they said. Evolvs claims became the synonyms of the ruthless marketing BS to me.
I even started to doubt that they indeed own and coded a data table referring to different Ni resistances. Though the fact that my Yihis' are displaying different temp was weird.

So after finishing with my temp/resistance curves I was checking @TheBloke latest temp measurement and pairing up the Ti and the Ni data on the TFR tab.
It didn't work too well. And the tolerance of my calculations and of Theblokes measurements didn't explain that either. Neither the fact that my Ti is just similar to Gr1.
So I have added a flat TCR option to the list and played with it.
And lo and behold:
A flat TCR of 0.0047 gives stupidly close result to TheBlokes measurement/
And I am sure that I have seen this data listed somewhere. Not here, but somewhere like this. And the worst thing that it could mean anything. Most likely it is a TCR between (0-100°C) as it is pretty bloody close to Ni200(20-100°C) And some ignorant or cynical or both bstrd decided it would have do.

@TheBloke: Please, say that you used some cheap DNA40 clone and not an Evolv one. Please

 

[notarobot]

Now, I am angry.
And I am sure that I have seen this data listed somewhere. Not here, but somewhere like this.

Maybe here.

 

[vapealone]

Maybe here.

Indeed.
Thank you
This company is where I have bought A120. Probably I ve checked Ni200 as well.
And the product page even lists it as 0-100°C (tho something is wrong w/ the link I guess)

I really hope @TheBloke used some cheap clone. Hard to believe that the revolutionary and uber high tech evolv guys didn't understand how TCR should be used.

 

[TheBloke]

Indeed.
Thank you
This company is where I have bought A120. Probably I ve checked Ni200 as well.
And the product page even lists it as 0-100°C (tho something is wrong w/ the link I guess)

I really hope @TheBloke used some cheap clone. Hard to believe that the revolutionary and uber high tech evolv guys didn't understand how TCR should be used.

Sorry, @vapealone , of course I didn't use a clone for the test - the whole purpose was to use a genuine DNA 40 for the tests. It is an HCigar HB40 with a later DNA 40 version that has the atty lock feature.

I will post my test setup, test method, full data etc later - it got too late (early) after getting the data to do so this morning.

Don't conclude so much so far though. Evolv say they implement the full Ni200 curve. I plan to test it with real Ni200 shortly. That will tell us more.

 

[TheBloke]

Thanks very much for your data @vapealone I am just popping in briefly now but will study it in more detail later today - looks excellent.