Different mod reading same coil at different resistance ?
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Yep, this is why it is good to have an understanding of Ohm law and Not push to the edge of capability.
Length of positive wiring
Soldering Quality
tank/RDA to Mod threading connection quality
Negative ground placement and connection quality
Lots of reasons for minor deviations.
I would not put to much on Chip inaccuracy these days. Firmware calculations are pretty much standard for calculating volts/watts/ohms........output accuracy is another matter.
Length of positive wiring
Soldering Quality
tank/RDA to Mod threading connection quality
Negative ground placement and connection quality
Lots of reasons for minor deviations.
I would not put to much on Chip inaccuracy these days. Firmware calculations are pretty much standard for calculating volts/watts/ohms........output accuracy is another matter.
Yep, this is why it is good to have an understanding of Ohm law and Not push to the edge of capability.
Length of positive wiring
Soldering Quality
Tank/RDA to Mod threading connection quality
Negative ground placement and connection quality
Lots of reasons for minor deviations.
I would not put to much on Chip inaccuracy these days. Firmware calculations are pretty much standard for calculating volts/watts/ohms........output accuracy is another matter.
This exactly. Double thumbs up
The problem is that different mods have different amounts of resistance throughout the whole circuit.
Let's assume that two mods with identical chips read the same resistance at the chip.
However, having different length wires to the 510 connector, different materials in the 510 connector (like a silver pin for example), different materials in the wire (one pure copper, the other a copper alloy) different solder types and amounts, etc... All alter the resistance slightly. When you're measuring to the hundredth of an ohm those tiny changes can be detected.
Remember, mods don't really read the resistance of the atomizer, they read the resistance of the completed circuit, and every piece of that circuit has it's own resistance.
Since the FDA announced their regulations I've been considering making my own mod and buying 10 chips and several 510 connectors that I can swap out as each one fails. If I do this I've decided to make the lowest resistance circuit I possibly can. That means using silver wire, silver solder, and a 510 connector made out of copper with a silver pin. It would greatly improve the accuracy of the ohms reading and voltage delivered to the atomizer by minimizing the resistance that is outside of the atomizer.
Let's assume that two mods with identical chips read the same resistance at the chip.
However, having different length wires to the 510 connector, different materials in the 510 connector (like a silver pin for example), different materials in the wire (one pure copper, the other a copper alloy) different solder types and amounts, etc... All alter the resistance slightly. When you're measuring to the hundredth of an ohm those tiny changes can be detected.
Remember, mods don't really read the resistance of the atomizer, they read the resistance of the completed circuit, and every piece of that circuit has it's own resistance.
Since the FDA announced their regulations I've been considering making my own mod and buying 10 chips and several 510 connectors that I can swap out as each one fails. If I do this I've decided to make the lowest resistance circuit I possibly can. That means using silver wire, silver solder, and a 510 connector made out of copper with a silver pin. It would greatly improve the accuracy of the ohms reading and voltage delivered to the atomizer by minimizing the resistance that is outside of the atomizer.
Hi guys,
So I built dual coil made out of staple wire, not sure what gauge 6 wraps each coil. ( pictured below) on my cuboid it reads .25 and on my kanger box 70 it reads .22? Is this normal? Thanks
Yes. They're both cheap Chinese mods, so their resistance readings are best characterized as approximate.
My RX200 always reads my builds a few hundredths of an ohm higher than my Pico, (which seems to be more accurate, with a better overall chipset).
Hi guys,
So I built dual coil made out of staple wire, not sure what gauge 6 wraps each coil. ( pictured below) on my cuboid it reads .25 and on my kanger box 70 it reads .22? Is this normal? Thanks
Yes that is pretty normal.
If one was .22 and the other was.52 then one of the mods would have an issue
Damn!! Someone knows their stuff haha!! When does the Fda ban come in effect? And what will it change?
The first stage comes into effect in 2 years. At that point all manufacturers and juice producers will have to have submitted their application for FDA approval. Juices will have to be tested. Any manufacturer or producer who doesn't meet this deadline will be instantly banned from selling any more products until after they've received FDA approval.
Those that have submitted their application will have another year to see if they get FDA approval or are rejected. If their products are rejected they are banned.
Sorry average. That is the second step.
The first is 8/8/2016.
After 8/8/2016 ni NO new mods, attys, or Juice can come to market without approval by FDA.
Technically speaking, this is not entirely correct.
In the electronics world, accurate real world low resistance measurements are done with Kelvin 4 wire measurement devices.
Enjoy this read:
http://www.tek.com/sites/tek.com/files/media/document/resources/LV_LR_e-hnbook_91113.pdf
Precisely what part do you think is not correct?
Your own link explains why a copper alloy wire connected to a pure copper PCB lead and a copper, brass, or silver 510 pin using tin solder causes resistance changes.
And as for your Kelvin 4 wire measurement device, that has nothing at all to do with what I said. If you think it does then I invite you to open up your mod, and count the number of wires that lead from your chip to the atomizer. How many wires are there? Only 2, right? So resistance is measured across the entire circuit, not just the atomizer, right?
There's a difference between reading something and understanding what it says and how that applies to your specific circuit. You read something. You clearly didn't understand how that applies to the circuit in a mod.
What I said is entirely correct, the resistance is being measured by the chip, and it's measuring the resistance across the entire circuit. There is no Kelvin 4 wire measuring device mounted inside the 510 connector taking accurate measurements of the atomizer, it's a 2 wire ohm meter inside the chip that is measuring the resistance of the entire circuit. Positive lead to negative lead at the PCB. That's where the measurement is taking place. And everything in between those leads is part of the resistance. Every soldered joint, every material change, every poor connection adds resistance to the circuit.
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