Ohms question

[Philabos]

New to this, building a new single coil with 26 ga wire today.
Tested the coil on the ohms meter, read at 1.21.
Ok, close to what I want.
Screwed the coil back into the tank and it reads .015.
Huh?
Anyone else run into this?

 

[Zaryk]

New to this, building a new single coil with 26 ga wire today.
Tested the coil on the ohms meter, read at 1.21.
Ok, close to what I want.
Screwed the coil back into the tank and it reads .015.
Huh?
Anyone else run into this?

Did you double check your post screws are tight? After heating the wire can deform a bit under the post screws and let the coil loosen up a bit, which can cause weird ohm readings.

 

[Don29palms]

Coils might be touching inside of the barrel of the tank causing a short.

 

[DaveP]

I vote for Don's response. It's touching ground somewhere to drop to almost a tenth of the free air resistance. Look for a loop on the coil deck that could touch the chimney.

 

[stols001]

IDK, I mostly get funky readings like that if one of the wires is loose in the post. It could equally be the other thing, but that tends to produce a 0.00 reading for me, not a resistance. But check both and see what's goin on because it could be either, and since it read fine on your Ohm's reader, the second scenario is equally possible, maybe one coil is just grazing the chimney or something. Etc.

Good luck,

Anna

 

[DaveP]

IDK, I mostly get funky readings like that if one of the wires is loose in the post. It could equally be the other thing, but that tends to produce a 0.00 reading for me, not a resistance. But check both and see what's goin on because it could be either, and since it read fine on your Ohm's reader, the second scenario is equally possible, maybe one coil is just grazing the chimney or something. Etc.

Good luck,

Anna

I agree.

It depends on which end of the coil is touching ground. At the negative end it just lowers the resistance a little. At the positive coil end a short can take it almost to ground potential.

 

[TVA Ryan Vapes]

I concur with these other responses. Either tightening issue, i.e: too tight or not tight enough or, the most likely cause imo, you are shorting out somewhere.

 

[Philabos]

Coils might be touching inside of the barrel of the tank causing a short.

Thanks for the responses all.
Yes, this is my number one suspect.
I fiddled with it a little today and seems to be holding at .8 now, still lower than I desire, but better.
I double checked the screws when it first happened and the leads and screws all appeared secure with leads cut back flush.
I will rebuild again tomorrow and see what happens.

 

[somdcomputerguy]

Thanks for the responses all.

Well thank you for asking questions here instead of maybe becoming a statistic that we, and certainly you, don't need.

 

[Philabos]

Did another coil today came in at 1.58 on the meter.
Mod at 1.6 .
After vaping for awhile slight variance to 1.64.
Is that normal?

 

[Beamslider]

Yes coil will change slightly with use

Also a hot coil will read higher especially SS

 

[Walee]

Did another coil today came in at 1.58 on the meter.
Mod at 1.6 .
After vaping for awhile slight variance to 1.64.
Is that normal?

Probably. Especially if it is SS, TI, or NI. Those wires will increase in resistance as they get hotter. Still concerned about your ohm meter. 1.21Ω is difficult to achieve with 26ga wire if it is SS. That's like 17 wraps on a 3mm rod. What are you using for a meter? Standard ohm meters will not read milliohms.

 

[Philabos]

Probably. Especially if it is SS, TI, or NI. Those wires will increase in resistance as they get hotter. Still concerned about your ohm meter. 1.21Ω is difficult to achieve with 26ga wire if it is SS. That's like 17 wraps on a 3mm rod. What are you using for a meter? Standard ohm meters will not read milliohms.

Using 32 ga twisted kanthal, only 5 wraps @ 2.5mm.

 

[stols001]

Slight changes in resistance can be normal and those are really super slight. Etc.

Anna

 

[93gc40]

What does steam-engine.org say your build should ohm at...

Sounds like you have internal shorting. Coil touching what it should not.... also are you measuring ohm with the VOM at the same contact points as the posts would have... if not you will get a high reading do to leg loss.

Sent from my SCH-I605 using Tapatalk

 

[Punk In Drublic]

I wouldn’t be too concern with slight variances. Steam Engine is an excellent source of reference but they are only calculating the true resistance of the coil through known parameters and not taking into account any influences the deck, 510 connection or any internals within the mod may have on the reading. Have a look at some of DJLsb Vapes videos on YouTube where he objectively compares the resistance readings from mods to the actual resistance that was read through sophisticated equipment. There is not a single mod (at least from what I’ve seen) that is 100% accurate.


1.21 ohms to 0.015 is drastic and identifies a problem as others mentioned. But 1.58 to 1.6 is acceptable. Also, coils should be read at room temperature

 

[Izan]

What are you using for a meter?

Echo- What are you using for a meter?
Some of the lessor meters are complete shiite.

What mod are you using? As noted above (@Punk In Drublic ) few are 100% accurate.

Cheers
I