DNA 200 Watt

[dwcraig1]

Looking for someone with some expertise with Escribe to clear up a question I have. I've just began working with Escribe & device monitor and learning the tool so I'm not really clear on it's capabilities or accuracy. The question I have is when using device monitor and Recording the data I find that no matter how I use the captured data to calculate Power it doesn't match the Recorded Power in the .csv log. So I'm in question of where does the Logged Power data come from? And why do all three calculations come up with different results when using 3 different formula's P=I*V, P=V^2/R, P=R*I^2 using the logged data? This leads me to believe the logged data is either in error, or is an approximation from some other data point that's not being logged or the time sync for each set of variables being captured is not in sync with the log? Hopefully someone can clear this up. It could be a useful tool but if it's not accurate it's not really meaningful to me.

Perhaps ask this in the Evolv forum, I took a look at it and all I could get in the CSV file was what it was set at not what it was firing at.

 

[Vlad1]

Perhaps ask this in the Evolv forum, I took a look at it and all I could get in the CSV file was what it was set at not what it was firing at.

I may try that if no one here can answer. I'm guessing you only had Power Set checked and not Power under Current Puff.

 

[dwcraig1]

My settings: 28 watts with 35 watt preheat @ 450F

Time Battery Pack Power Power Setpoint Cold Ohms Live Ohms Last Puff Power Last Puff Temperature Temperature Temperature Setpoint
0 12.41 28 0.356 28.3 379.06 450

 

[dwcraig1]

My settings: 28 watts with 35 watt preheat @ 450F

Time Battery Pack Power Power Setpoint Cold Ohms Live Ohms Last Puff Power Last Puff Temperature Temperature Temperature Setpoint
0 12.41 28 0.356 28.3 379.06 450

Can't get the CSV to upload

 

[Vlad1]

My settings: 28 watts with 35 watt preheat @ 450F

Time Battery Pack Power Power Setpoint Cold Ohms Live Ohms Last Puff Power Last Puff Temperature Temperature Temperature Setpoint
0 12.41 28 0.356 28.3 379.06 450

Can't get the CSV to upload

Need to collect Current, Voltage and Resistance to calculate the Power.

On mine this is all I have checked : Nothing in the upper left frame "Battery" or Lower frame "Statistics" are check marked
Power
Power Set
Temperature
Temperature Set
Current
Voltage
Cold Ohms
Live Ohms

 

[Vlad1]

It looks like you have about 10 items checked but only logging about 7 if I'm seeing it correctly.

 

[dwcraig1]

Hard to see but that's 6.59 amps
Comes real close to 28 watts no matter which way you figure it, the CSV file I'm lost with.

 

[Vlad1]

Hard to see but that's 6.59 amps
Comes real close to 28 watts no matter which way you figure it, the CSV file I'm lost with.

Post the header and a few lines of the log if you would please. I can put it back into a spreadsheet.

 

[dwcraig1]

Time Battery Pack Current Power Power Setpoint Cold Ohms Live Ohms Temperature Temperature Setpoint Voltage
0.141 12.5 28 0.351 450
it is not showing everything I have checked.
The rest of the numbers are the same on each line.

 

[Vlad1]

Time Battery Pack Current Power Power Setpoint Cold Ohms Live Ohms Temperature Temperature Setpoint Voltage
0.141 12.5 28 0.351 450
it is not showing everything I have checked.
The rest of the numbers are the same on each line.

Well that's buggy for sure. I don't seem to be missing any of the selected items in my log running Escribe version 1.0.32. Hard for me to determine which metrics are missing from your log to calculate it out.

 

[dwcraig1]

Time Battery Pack Current Power Power Setpoint Cold Ohms Live Ohms Temperature Temperature Setpoint Voltage
0.141 12.52 28 0.355 450
0.313 12.52 28 0.355 450
0.5 12.52 28 0.355 450
0.672 12.52 28 0.355 450
0.86 12.52 0.43 3.46 28 0.355 0.427 147.55 450 3.85
1.047 12.42 7.88 31.9 28 0.355 0.546 281.02 450 4.25
I guess I just learned how to work it
Seems to be with in around 0.1 watt figured all 3 ways.

 

[retird]

I may try that if no one here can answer. I'm guessing you only had Power Set checked and not Power under Current Puff.

James, John, and/or Brandon from Evolv can easily answer your questions and your assumptions in the Evolv forum. If you feel their firmware has "bugs" there is a place to report them also.

 

[Vlad1]

Time Battery Pack Current Power Power Setpoint Cold Ohms Live Ohms Temperature Temperature Setpoint Voltage
0.141 12.52 28 0.355 450
0.313 12.52 28 0.355 450
0.5 12.52 28 0.355 450
0.672 12.52 28 0.355 450
0.86 12.52 0.43 3.46 28 0.355 0.427 147.55 450 3.85
1.047 12.42 7.88 31.9 28 0.355 0.546 281.02 450 4.25
I guess I just learned how to work it
Seems to be with in around 0.1 watt figured all 3 ways.

Either you or I aren't doing the math correctly. Or I'm not lining up the header correctly with the collected data.

But using Time line 1.047
Logged Power = 31.9W
Current = 7.88A
Live Ohms = .546Ω
Voltage = 4.25V

So if this data is correct we should be able to calculate the Power using any of the variables and match the "Logged Power".

Calculated Power using P=IxV: 7.88A * 4.25V = 33.49W
Calculated Power using P=V^2/R: 4.25V^2 / .546Ω = 33.08W
Calculated Power P=R*I^2: .546Ω * 7.88^2 = 33.903W

So this is very similar to what I was seeing and questioning. If these data points that are being collected are accurate and the "Logged Power" is accurate these should result in a answer of 31.9W but they don't. So is it an approximation, time sync problem with the data being logged. Is the Power being logged from some other source???? IDK but appears you've confirmed it's not isolated to my system or device.

 

[jazzvaper]

Either you or I aren't doing the math correctly. Or I'm not lining up the header correctly with the collected data.

But using Time line 1.047
Logged Power = 31.9W
Current = 7.88A
Live Ohms = .546Ω
Voltage = 4.25V

So if this data is correct we should be able to calculate the Power using any of the variables and match the "Logged Power".

Calculated Power using P=IxV: 7.88A * 4.25V = 33.49W
Calculated Power using P=V^2/R: 4.25V^2 / .546Ω = 33.08W
Calculated Power P=R*I^2: .546Ω * 7.88^2 = 33.903W

So this is very similar to what I was seeing and questioning. If these data points that are being collected are accurate and the "Logged Power" is accurate these should result in a answer of 31.9W but they don't. So is it an approximation, time sync problem with the data being logged. Is the Power being logged from some other source???? IDK but appears you've confirmed it's not isolated to my system or device.

What I have found may or may not be relevant to your question:

1. eScribe assumes (or at least I believe it assumes) that your atomizer is configured "optimally".

2. The atomizer tool will assist as to ohms but there is, as I am sure you know, much more to optimal atomizer performance than resistance, namely secure connections and properly set 510, et al.

Case in point:

You will recall our test-a-tet on the Kayfun 4. I have two of'em. One gave me expected results, the other not (assembled less than optimally). Same with my SquapeRs (510 needed adjustment).

Cutting to the chase: unless your atty is indeed optimally configured your eScribe readings will be inaccurate.

 

[Vlad1]

What I have found may or may not be relevant to your question:

1. eScribe assumes (or at least I believe it assumes) that your atomizer is configured "optimally".

2. The atomizer tool will assist as to ohms but there is, as I am sure you know, much more to optimal atomizer performance than resistance, namely secure connections and properly set 510, et al.

Case in point:

You will recall our test-a-tet on the Kayfun 4. I have two of'em. One gave me expected results, the other not (assembled less than optimally). Same with my SquapeRs (510 needed adjustment).

Cutting to the chase: unless your atty is indeed optimally configured your eScribe readings will be inaccurate.

Are you saying Escribe isn't actually logging actual correct data for the Logged Power or Current, Voltage, Resistance and is only making assumptions or estimates to these variables? I think understand your point but what I'm looking at is all the data is from the same source "Escribe" but the data don't align so the question is, is one of them correct and the others are assumed or approximations or just a logging problem with the time of sync. I realize it only takes a very small change in any of the variable to throw off the calculations but which is the correct set of data points to look at? If Escribe says it's outputting in this case 31.9W, it calculated that from data it received from somewhere. Clearly not from the same data that was logged on the same timeline from what I can tell.

 

[druckle]

Are you saying Escribe isn't actually logging actual correct data for the Logged Power or Current, Voltage, Resistance and is only making assumptions or estimates to these variables? I think understand your point but what I'm looking at is all the data is from the same source "Escribe" but the data don't align so the question is, is one of them correct and the others are assumed or approximations or just a logging problem with the time of sync. I realize it only takes a very small change in any of the variable to throw off the calculations but which is the correct set of data points to look at? If Escribe says it's outputting in this case 31.9W, it calculated that from data it received from somewhere. Clearly not from the same data that was logged on the same timeline from what I can tell.

I know this has been suggested to you before but if you want accurate answers to your questions go to
Evolvapor.forumchitchat.com and post your questions or PM John or James or both. They will answer your questions and you won't have to be confused by asking folks here who may or may not know the answers but will out of courtesy try to send their opinions.

Duane

 

[jazzvaper]

^^^^^ I am saying I would not rely on any eScribe data unless I am certain my atty is properly configured. That maybe too strong a constraint but it is what I am holding myself to.

 

[dwcraig1]

Either you or I aren't doing the math correctly. Or I'm not lining up the header correctly with the collected data.

But using Time line 1.047
Logged Power = 31.9W
Current = 7.88A
Live Ohms = .546Ω
Voltage = 4.25V

So if this data is correct we should be able to calculate the Power using any of the variables and match the "Logged Power".

Calculated Power using P=IxV: 7.88A * 4.25V = 33.49W
Calculated Power using P=V^2/R: 4.25V^2 / .546Ω = 33.08W
Calculated Power P=R*I^2: .546Ω * 7.88^2 = 33.903W

So this is very similar to what I was seeing and questioning. If these data points that are being collected are accurate and the "Logged Power" is accurate these should result in a answer of 31.9W but they don't. So is it an approximation, time sync problem with the data being logged. Is the Power being logged from some other source???? IDK but appears you've confirmed it's not isolated to my system or device.

Well what I can say here about the 33 watts is that it is the preheat.
I should have included more of it I guess, I seemed to have only posted the preheat part.

 

[Vlad1]

I know this has been suggested to you before but if you want accurate answers to your questions go to
Evolvapor.forumchitchat.com and post your questions or PM John or James or both. They will answer your questions and you won't have to be confused by asking folks here who may or may not know the answers but will out of courtesy try to send their opinions.

Duane

Thanks, yea dcwcraig suggested the same. Functionally it's not really a problem, it's probably close most the time I guess, I was just thinking it would be more accurate. What got me focused on it was some major discrepancies usually on initial firing that were close to 40W off when calculated from what was being logged as the Live Power. BTW for what it's worth using the same wire / atty in the 200 I have to run it in the 540F range as well. I'm thinking I received a different batch of wire or something than you did.

 

[Vlad1]

Well what I can say here about the 33 watts is that it is the preheat.
I should have included more of it I guess, I seemed to have only posted the preheat part.

It shouldn't matter the logged power should = the calculated power regardless if it's in preheat or after preheat. There's just some inconsistency somewhere from what the logged live power is and the other variables. Could be something as simple as the snapshot timing of the live power vs when the other variables snapshot is taken then when their logged. It's not that important but good to know it's not actual and just a visual reference.