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SXK Supbox Incorrect Resistance Help Needed


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I recently purchased an SXK DNA 60 Supbox device. Fantastic little mod if it wasn't for a pesky issue with the resistance not reading correctly. For example, the actual cold resistance will read 0.61 ohms on my USA-made ohm meter and other DNA devices, but on the Supbox will read 0.66-0.67 ohms.

The 510 connector has a nice spring tension, and does not indicate obvious problems when running Atomizer Analyzer in EScribe while screwing the atty in and out.

Strange thing is, TC seems to be working well, and feels consistent throughout a range of temps compared to the same atty / temp settings on other DNA devices which are reading the resistance accurately. I forced the resistance to the actual cold value in EScribe, locked it in, and found TC not functioning at all, immediately going into protection.

I'm not getting much help from the seller in China, or SXK. The device honestly seems to be functioning as well as my other DNA devices in TC, but still bothers me greatly not reading accurately. I have no soldering skills, and am kind of afraid to take the Supbox apart... Sending it back isn't a viable option either.

What I would like to know, is there any way to manipulate the mod resistance or other pertinent settings in EScribe to fudge the cold resistance reading back close to where it should be? I'm wondering if TC would not function properly like when the resistance was forced and locked to it's cold value if I were able to do it..

Any ideas would be appreciated... If it wasn't for the reading being off, I wouldn't notice any difference in TC performance to my other DNA devices.. That's a head-scratcher to me for certain..

Edited by TechnoMania
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This video shows an extender plate for the 510....  wondering if that may make a difference in resistance???  Would there be a difference if the extender plate was removed and the atty screwed into the base 510???  Just a thought....

 

 

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Thanks... I tested both with and without the extension. Doesn't make any difference. The extension is good quality, and gave proper readings when tried on other DNA devices to test. When connected to EScribe, I used the native connector for testing. Given the TC performance seems up to par with incorrect resistance readings, and not functioning when forced to the actual cold resistance, perhaps points to the board being out of calibration?

These devices have been out for a few months now, and I can find no other similar issue reported out there...

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42 minutes ago, retird said:

Link to DNA60 Datasheet in case you don't have it:  https://downloads.evolvapor.com/dna60.pdf

I don't own a DNA60 device so others around here will be of more help but what does EScribe show as the ohm value under the Mod/Electrical tab?

Thanks...It is set to '0'. It doesn't appear that the manufacturer contributed any info, but I would imagine there would be at least a few other complaints out there if it caused this type of issue. I would like to wrap my head around why it seems to be functioning great in TC despite the incorrect ohm reading.

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You can short the 510 on the mod and read the resistance from the Atomizer Analyzer (don't fire it and it isn't necessary - a spark is normal [0.5v]). And the value it says you need in put in EScribe's mod resistance. And the resistance being off by 0.06Ω shouldn't affect the TC working as long as the connection is solid. Although the temperature setting may not be accurate and maybe off a dozen or so degrees.

 

2020-12-23_224949.png.76ea7deb3310de2ad41b7e24acbdd540.png

Edited by BillW50
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That '0' value IF changed (raised) will lower the measured resistance of your coil. The evolv default for their other boards is 0.004Ω You should start with that. .We're talking milliohms here. Mine, measured accurately, range from 0.002 to 0.008Ω but I have heard of other mods much higher.

"From the output of the board, there are several resistances in series that make up the load. First you have the wires running to the connector. Then you have the connector body itself. Then you have the interface between the connector and the atomizer. Then you have the atomizer body, then the connection between the atomizer and the coil. Then and only then do you actually get to the coil. 

All these elements have some resistance, and resistances in series add up"

I have never fudged a coil resistance more than a few milliohms one way or the other. As far as your other mods and ohm reader, they're all probably in the ballpark, it all comes down to precision. Remember a .67Ω coil could be anywhere from .666 to .674 and will all display .67 on your mod
 

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7 hours ago, BillW50 said:

You can short the 510 on the mod and read the resistance from the Atomizer Analyzer (don't fire it and it isn't necessary - a spark is normal [0.5v]). And the value it says you need in put in EScribe's mod resistance. And the resistance being off by 0.06Ω shouldn't affect the TC working as long as the connection is solid. Although the temperature setting may not be accurate and maybe off a dozen or so degrees.

 

2020-12-23_224949.png.76ea7deb3310de2ad41b7e24acbdd540.png

Thanks! I'll give that a try. Hopefully, it will help some, but the manufacturer more than likely set all of these up the same way, and I'm the only one complaining about a blatant issue when Googled. OTOH, I may just be that unlucky one out there who received one with issues..

 

I was actually able to pass a cotton burn / singe test set at 420F with SS316L... When I set it at 380F, it feels like 380F on my other devices, 420F feels like 420F in comparison etc.. I do strive for tight connections in TC when assembling / building my attys, so I'm sure that's helping. I'm just hoping that I can get this straightened-out. It just bugs the hell out of me.

Why would TC cease functioning and immediately go into protection when fired after locking the actual cold resistance value in EScribe? My USA-made ohm meter reads resistance showing the fluctuations (for example 61.2 ohms, with the .2 fluctuating slightly, sometimes back to 60.9). Shouldn't that work well as the actual value when say, 0.61 ohms is forced and locked in?...

Edited by TechnoMania
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19 minutes ago, TechnoMania said:

but the manufacturer more than likely set all of these up the same way, and I'm the only one complaining about a blatant issue when Googled. OTOH, I may just be that unlucky one out there who received one with issues..

The manufacturer ONLY left the evolv standards alone. Changed nothing. Zip, zero zilch.

You're the only one that noticed. To repeat myself, you just need to measure and set the internal mod resistance.

Your ohm reader fluctuates because it's applying power to the coil. There is no great mystery
 

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First, when you say protection, it is vaping at the set temperature or does it stop producing vapor? Big difference. The former is normal and the latter there is a problem.

In my experience when it pops instantly into the latter protection, the TFR/TCR is likely set wrong for that material type. SS is tough since it is an alloy, the temperature coefficient can vary from manufacture to manufacture and even batch to batch. If the temperature is hitting correctly, the TFR/TCR can't be too far off, or the temperature control would be off a lot too.

Now does your USA-made ohm meter reads resistance showing the fluctuations just for that atty, or for everything? If just that atty is fluctuating, this too could cause it to instantly go into protect. Locking the resistance, only locks the cold resistance and not the live fluctuating resistance. And Wayneo is right too btw.

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44 minutes ago, BillW50 said:

First, when you say protection, it is vaping at the set temperature or does it stop producing vapor? Big difference. The former is normal and the latter there is a problem.

In my experience when it pops instantly into the latter protection, the TFR/TCR is likely set wrong for that material type. SS is tough since it is an alloy, the temperature coefficient can vary from manufacture to manufacture and even batch to batch. If the temperature is hitting correctly, the TFR/TCR can't be too far off, or the temperature control would be off a lot too.

Now does your USA-made ohm meter reads resistance showing the fluctuations just for that atty, or for everything? If just that atty is fluctuating, this too could cause it to instantly go into protect. Locking the resistance, only locks the cold resistance and not the live fluctuating resistance. And Wayneo is right too btw.

Thanks! I appreciate the help. Going into protection immediately as in producing no vapor.. TC does not function at all when the actual atty cold resistance value is set and locked in EScribe... The SS316L material file is the same as I used for years, and works well on all other DNA devices I have. The Ohm meter is a stand-alone unit with a 510. Only made for reading the atty...

I would think that TC shouldn't stop functioning when the actual cold resistance value is locked (forced using atty analyzer)  into EScribe, compared to working quite well with inaccurate resistance.. I'll post back after I short the atty and set the mod resistance..

 

EDIT: BTW: Even running TC with the inaccurate resistance value, I have not been locking the resistance in. The board goes through refinement, and seemingly functions as it should.There is no abnormal resistance drifting. I only locked the actual measured cold resistance in when I was in EScribe running atty analyzer for testing.

Edited by TechnoMania
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Well locking the resistance locks the the resistance that it assumes is at room temperature. Say the coil temperature is currently at 400°F (hot coil) and you lock it. Now it will be 400 - 70 = 330°F hotter than the set temperature.

Since the DNA also has what is called refinement. Anyway you normally shouldn't need to lock the resistance. See for yourself from the manual.

Quote

Resistance lock: The DNA 60 relies on the cold resistance of the atomizer to measure temperature accurately. If the connection is not stable or if you find the measured resistance drifts with time, it may be desirable to lock the atomizer resistance. To do so, while locked hold both the Fire and Up buttons for two seconds to enter Resistance Lock mode. In this mode, the DNA60 will use the present atomizer cold resistance without refinement until the atomizer is disconnected or the resistance lock is disabled. A lock symbol will replace the ohm symbol on the display. To disable resistance lock, repeat the procedure to lock it.

Now why would locking the resistance at room temperature cause it to stop firing (kicking out)? For some reason the DNA thinks the coil is heating up a lot faster than it should based on the sharp increase in resistance. Thus it kicks out before something starts toasting. This could happen if the live resistance in TC mode doesn't have a solid enough connection. Or if the TFR/TCR is way off. Another reason is the wick is dry.

Now the Supbox has that 510 adapter ring. That is an extra piece and added resistance that other mods usually doesn't have. That piece could be a source of instability too. Cleaning it and the threads with alcohol could help.

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45 minutes ago, BillW50 said:

Well locking the resistance locks the the resistance that it assumes is at room temperature. Say the coil temperature is currently at 400°F (hot coil) and you lock it. Now it will be 400 - 70 = 330°F hotter than the set temperature.

Since the DNA also has what is called refinement. Anyway you normally shouldn't need to lock the resistance. See for yourself from the manual.

Now why would locking the resistance at room temperature cause it to stop firing (kicking out)? For some reason the DNA thinks the coil is heating up a lot faster than it should based on the sharp increase in resistance. Thus it kicks out before something starts toasting. This could happen if the live resistance in TC mode doesn't have a solid enough connection. Or if the TFR/TCR is way off. Another reason is the wick is dry.

Now the Supbox has that 510 adapter ring. That is an extra piece and added resistance that other mods usually doesn't have. That piece could be a source of instability too. Cleaning it and the threads with alcohol could help.

I edited my post to include:

"EDIT: BTW: Even running TC with the inaccurate resistance value, I have not been locking the resistance in. The board goes through refinement, and seemingly functions as it should.There is no abnormal resistance drifting. I only locked the actual measured cold resistance in when I was in EScribe running atty analyzer for testing."

 

I appreciate the help.. I'm no expert, but I've been on-board with Evolv since the Darwin, and know my way around as far as testing with a cold resistance, refinement, materials, cleanliness, TCR TFR values, etc... I already determined that the Supbox extension connector isn't the issue.. Everything pretty much troubleshot by the book before I opened a ticket with Evolv, only to pretty much stump the tech who was helping me as well. I haven't had a reply to my last question for a couple of days now, and thought I would run it by the DNA collective here.

I was aware that the displayed cold resistance could be manipulated via the mod resistance setting, and perhaps others in EScribe. Thanks to the knowledge base here, my issue has now been resolved. I find it a sad commentary that in 2020, vapers haven't yet caught-on to the importance of temp-limiting in direct relation to the harm-reduction that it provides in keeping potential nasties at bay. There must be so few folks using TC out there, that after a few months of sales, no one else noticed that the resistance readings are off on these devices.. NOT acceptable for a device with an Evolv board. Folks are going to get the impression that their DNA device is less accurate than the Chinese counterparts.

The mod resistance reading came out to 0.066... The Supbox is now reading the resistance properly, and I am a VERY happy camper! Thanks a lot everyone!! Happy Holidays to you and yours.. Time to close my Evolv ticket...

Edited by TechnoMania
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Glad you got it sorted out.  It's a shame that the device manufacturer didn't do his job.  If you hadn't been adept in how the DNA should work you probably would not have noticed it as an issue either.  Enjoy, and Merry Christmas to you also....

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