3 different reading

[SDGIANTSFAN]

Ok....So

I did a rebuild on a new Tobh dripper
dual coil, 28 kanthal 7 wraps on a #0 precsion screwdriver....just smaller than a 5/64th drill

my ohm reader is saying 1.30, my vaporshark dna 30 is reading .70 and my MPV is showing 1.8

Educate me....

 

[edyle]

Ok....So

I did a rebuild on a new Tobh dripper
dual coil, 28 kanthal 7 wraps on a #0 precsion screwdriver....just smaller than a 5/64th drill

my ohm reader is saying 1.30, my vaporshark dna 30 is reading .70 and my MPV is showing 1.8

Educate me....

Take a longer piece or 28 gauge and connect it to the posts instead - don't bother to coil it;

then put the atty on each of the 3 and compare readings again to see if there is consistency.

By consistency I mean that
the vaporshark dna reads the lowest
the ohm reader reads 0.6 ohms more than the dna
the MVP reads 1.1 ohms more than the dna.


oh; first you can also check what they read with a direct short; to get a direct short use a piece of copper wire instead of kanthal; but I dunno if the dna fires the coil to test ohms

 

[eyerhere]

I threw that coil build int my calculator and came up with 0.6 ohms so my gut tells me that your vapor shark is right. A way you could chck it like edyl said taken one step further would be to use a 1 inch piece measured from screw to screw. I don't remember the resistance per inch of kanthal. but you should be able to find it online. That will tell you for sure.

 

[eyerhere]

found it 1 inch of kanthal should read .439 ohms.
5.27 ohms per foot for 28 guage kanthal.,

 

[Roscoe01]

Yep should be .6 ohm build. Sounds like a loose negative post screw or broken leg.

 

[edyle]

I threw that coil build int my calculator and came up with 0.6 ohms so my gut tells me that your vapor shark is right. A way you could chck it like edyl said taken one step further would be to use a 1 inch piece measured from screw to screw. I don't remember the resistance per inch of kanthal. but you should be able to find it online. That will tell you for sure.

Excellent method!

AWG 20: Low Resistance (0.07 ohms/inch)

AWG 22: Low Resistance (0.11 ohms/inch)

AWG 24: Low Resistance (0.175 ohms/inch)
AWG 26: Low Resistance (0.28 ohms/inch)
AWG 28: Low - Standard Resistance (0.44 ohms/inch)
AWG 30: Low - Standard Resistance (0.70 ohms/ inch)
AWG 32: Low - Standard Resistance (1.1 ohms/ inch)
AWG 33: Low - Standard - High Resistance (1.39 ohms/inch)
AWG 34: Standard - High Resistance (1.76 ohms/inch)

Kanthal A1 Resistance Wire (AWG 20, 22, 24, 26, 28, 30, 32, 33 & 34 - 3 Feet)

Using the table as a reference you already know what your wire resistance is supposed to be and so you can measure the zero offset of your devices.

In the case of the MVP you probably get some extra resistance from the mvp itself; I would have expected the ohm reader to show the lowest resistance.

 

[iDanieljviaiTaste]

7 wraps with 28 gauge usually comes out around 1.3 and when you dual coil, it cuts that number in half. So if both your coils are reading 1.3 by themselves, it would read somewhere around .6 when they are combined.

 

[edyle]

Oh, dual coil; as roscoe suggested, you probably have 1 coil lose and it happened to get picked up by the dna but was loose/disconnected when you put it on the MVP and the ohm reader.

 

[SDGIANTSFAN]

Oh, dual coil; as roscoe suggested, you probably have 1 coil lose and it happened to get picked up by the dna but was loose/disconnected when you put it on the MVP and the ohm reader.

Will test when I get back from work, again a Plethora of info here....Ahhhh able to use my word of the day

Thanks All

 

[eyerhere]

Tomorrows word will be machiavellianism.

 

[SDGIANTSFAN]

Tomorrows word will be machiavellianism.

Now that's deep....

 

[K_Tech]

As others have posted, I think something's loose...

Tomorrows word will be machiavellianism.

Are we doing the rest of the Dark Triad next week?

 

[eyerhere]

I will ask the magic 8 ball

 

[wa9w00d]

A small thing I try to do when mounting dual coils - leave the "tails" on till you think you have the capture screws as tight as you want them, then wiggle the tail to break it off, but watch your coil closely. If the coil moves at all, you haven't fully captured that wire.