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Drop RDA

Discussion in 'RDA' started by PuffKnight, Sep 17, 2018.

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  1. PuffKnight

    PuffKnight Full Member

    Sep 12, 2018
    So I'm trying to do a new build and no matter which coil I try out of my coil pack, or which mod I try it on, it just keeps saying, "ohms too low" and I've tried it on my alien 220w and Devilkin 225w. Not sure what this means.
     
    • Optimistic Optimistic x 1
  2. Beamslider

    Beamslider Vaping Master Verified Member ECF Veteran

    May 29, 2017
    San Francisco
    Maybe a short or something touching the coil. Could be not tightened down enough.
     
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  3. PuffKnight

    PuffKnight Full Member

    Sep 12, 2018
    So what does that mean? I made sure they were tightened down.
     
    • Like Like x 1
  4. papergoblin

    papergoblin Super Member Verified Member ECF Veteran

    Nov 16, 2013
    alabama
    A- RDA screwed down too tight on mod not tight enough - check center pin
    B- Short inside RDA - check coils aren't touching across +/- or sides or top
    C- Coils are too low resistance for mod to fire
     
    • Like Like x 2
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  5. papergoblin

    papergoblin Super Member Verified Member ECF Veteran

    Nov 16, 2013
    alabama
    I didn't think to as but what type of coils are you trying to use? I mean kanthal, ss, etc., what are the resistance of the coils and how many are you attempting to use?
     
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  6. PuffKnight

    PuffKnight Full Member

    Sep 12, 2018
    First time I was trying to use two fused clapton coils, one per side, and the container says resistance is about .4 ohms and after I went to adjust one of the coils after a test fire, it flashed on the second test fire and the coil literally snapped right off the second I touched it
     
    • Optimistic Optimistic x 1
  7. papergoblin

    papergoblin Super Member Verified Member ECF Veteran

    Nov 16, 2013
    alabama
    If the coil flashed, then it was a hotspot and?or too high wattage. It could also be a sharp spot in the post, I've had several RDA's that would cut wire when tightened down. Then again could be just a bad coil, if you remove the flashed coil, the other should work. 1 coil .4 ohms so 2 would have been .2 ohms.

    Could always remove all coils and test bare RDA, should show attach atomizer or something and read no resistance, as nothing is connected.
     
    • Agree Agree x 3
  8. PuffKnight

    PuffKnight Full Member

    Sep 12, 2018
    Tested out bare rda on both and it is still only saying ohm too low
     
    • Optimistic Optimistic x 1
  9. Zaryk

    Zaryk Ultra Member Verified Member ECF Veteran

    Jan 25, 2018
    Ohio
    Examine your deck and see if there is any small scraps of wire laying anywhere on it. Sometimes a stray leg clipping can bridge the gap between the positive and negative sides of the deck. This would cause all sorts of issues.
     
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  10. Don29palms

    Don29palms Moved On ECF Veteran

    Sep 12, 2014
    joshua tree, ca
    It just takes a very small clipping to ground out the positive post. When I first got my Drop after I installed and clipped the coils I had the same problem. I took the RDA completely apart and found a tiny piece of the clapton coil wrap. I cleaned it off, put it back together and haven't had any problems since then.

    This is a good reason to have an ohm meter and know how to use it.
     
    • Agree Agree x 5
  11. Punk In Drublic

    Punk In Drublic Vaping Master ECF Veteran

    Aug 28, 2018
    Toronto, ON
    I agree that an Ohm meter can be a very handy tool. Always good to have a separate tool for verification. You can get the more expensive ones that allow you to fire the coil, or just a simple cheap one that only reads the resistance of the coil that will also identify any shorts. I use some cheap generic one that runs off of AA batteries.

    You also have to be careful when tightening down your posts with multi stranded coils such as claptons. Too tight and one strand can cut right through another. Tighten down enough so that the coil does not move

    With any coil, especially premade ones, there will always be a variance between what is advertised, what your mod reads and what is the actual resistance of the coil. Given how easy it is to build on the Drop RDA, mount 1 coil only, place it on your mod and see what the resistance is. Adding an identical second coil in parallel will half that resistance which should give you and good idea if your mod is ample enough to handle your projected build.

    I always count the trimmings that I cut off to ensure one is not left behind inside the deck or found its way to the floor. Nothing worse than having a piece of metal in your foot, or if you have pets and sprogs (little people sometimes referred to as children)
     
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  12. Hightech Redneck

    Hightech Redneck Vaping Master Verified Member ECF Veteran

    Mar 27, 2015
    N C
    To ask the question that has been overlooked.
    Most premade have long leads, you are trimming them once snugged into place, right?
    If not and the lead touches the base in the positive leg you get a dead short.

    Try installing a single coil on one side, then fire it (low wattages) and see the resistance the mod reads. With dual coil it will basically be one half the resistance of a single.

    If still stuck post a pic of your build etc and we will try to help.
     
    • Like Like x 2
  13. Zaryk

    Zaryk Ultra Member Verified Member ECF Veteran

    Jan 25, 2018
    Ohio
    Not true. The deck on the drop is split down the middle, one side + and one side -. If the leads touch the deck it will just be touching the corresponding polarity of the post it is attached to.
     
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  14. Hightech Redneck

    Hightech Redneck Vaping Master Verified Member ECF Veteran

    Mar 27, 2015
    N C
    Well true but,
    Since the positive post base is round in the middle its is very possible to hit it with a long negative leg.
    But I digress.
    Just making sure he was trimming the leads basically.
     
    • Like Like x 3
  15. Don29palms

    Don29palms Moved On ECF Veteran

    Sep 12, 2014
    joshua tree, ca
    If an RDA is reading ohms too low with no coils in it that means there is a dead short somewhere in the RDA itself.
     
    • Agree Agree x 4
  16. mimöschen

    mimöschen Ultra Member ECF Veteran

    Jul 15, 2016
    In that case check if the insulators are all in place. If there's one missing or defective, which might happen if you tighten the positive post far too tight, get a replacement.
     
    • Useful Useful x 1
  17. PuffKnight

    PuffKnight Full Member

    Sep 12, 2018
    So I ended up going into my local shop anyways and got chatting with the attendant and I had it in my case in the car, we took it apart, and part of my clapton coil had lodged itself way down inside the damn thing. We had tried firing off a mech mod first and it immediately started glowing way off down to the side. I appreciate all the help everyone! Going to just be much more careful building. Thank God for the newer mods with the protections and whatnot. If I'd been running off a mech mod and went about it differently I'm sure it wouldve/couldve caught fire on me.
     
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  18. Punk In Drublic

    Punk In Drublic Vaping Master ECF Veteran

    Aug 28, 2018
    Toronto, ON
    Good to hear you found out what the culprit is. Just note you can take both the + and – terminals out of the Drop RDA in the event another clipping gets lodged.
     
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  19. PuffKnight

    PuffKnight Full Member

    Sep 12, 2018
    Yeah that's what we did at the shop and I guess I kinda forgot RDAs are simple enough for that lol
     
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  20. Zaryk

    Zaryk Ultra Member Verified Member ECF Veteran

    Jan 25, 2018
    Ohio
    Glad to hear you safely found the issue.

    That is one thing that bothered me about the drop, your coil trimmings has nowhere to go but into the juice well. I recommend trimming your coils before installing them. With tge drop you dont have to be super accurate on leg length so that's a plus.
     
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