measuring resistance with digital multi meter

[dustinmallot]

every time i try to get the resistance of the leads it never work always gives me crazy off number wondering why? i have it set to the lowest setting which is 200 on my multi meter. im trying to get a reading off a vivi nova prebuilt 1.8 oms atomizer head just trying to get a feel for measuring resistance before i start rebuilding my own coils. also every time i try to get a reading on my vivi nova it gives me different numbers every time. any help would be great.

 

[michliu]

I have a couple of cheap <$10 multimeters and they do the same thing. First hold the two leads tip to tip and see what the resistance of the wires and device is. You have to hold them very still to get the readout to keep from jumping all over. This will give you a sense of how still you need to keep the leads. Then when you measure your viv nova, I have found that measuring with just te tip of the leads and holding very, very, very still so the leads don't slide around on the threads or the base works best. It still jumps around a bit, but I found I could get within .3 ohms if I keep it still enough. My prebuilt 1.8 ohm head came to 2.4 on the multimeter and when I stuck it on my Lavatube, it measured 2.1. Hope this helps.

 

[bacc.vap]

If 200 hundred is the lowest setting it may be that it just can't read the low ohms properly, should have a meter that will go down to 20 or have auto ranging. It would'nt hurt to try cleaning your leads and what you're testing also.

 

[dustinmallot]

Also what is the Max highest ohm I can use on a eGo-T upgrade? 650 mah battery

 

[cedric212]

I usually stand the ViviNova on it's head and measure the resistance by touching the positive lead to the center post and the negative lead on the threads. If the number fluctuates up and down, you may have a short. So unless proven otherwise, DO NOT fire it up using your PV. Not sure about what's the highest ohm an Ego could use, but usually my ViviNova heads comes out to be 2-2.4 ohms. Since I'm using the $5 Centech purchased from Harbor Freight, that number I would expect a ~5% error.

 

[MrKV]

I believe the voltage on the ego-t is advertised around 3.4-3.7, definitely not above that.

I would try to keep the ohms between 1.5-2.5. This chart should hrlp you out a little.

 

[bacc.vap]

Also what is the Max highest ohm I can use on a eGo-T upgrade? 650 mah battery

There is'nt really a highest you can go to, it's what's your preference for the vape you want. If I had an ego-t upgrade I would probably never use the 3.3v regulated mode, except maybe to do dry burns. Unregulated at 4.2v I would get a good vape at 2ohms, as the battery dropped it's voltage I'd probaly rather have 1.5ohms. As high as 3ohms would work for me at 4.2v, but it would very quickly become unacceptable as the batt voltage dropped.

 

[Aoi~]

How to use cheap DMM.
1. Touch the lead together, get a read. This is your internal resistance. (Mine is 0.4ohm, I just sorta memorized it, but still check from time to time)
2. Measure the item you want to get a reading for. For Vivi Nova heads, positive lead goes in the center post hole, negative lead on the body (I touch just where the base and the 510 connector begins), get a read.
3. Subtract the internal resistance from the reading that you get from Step #2. Should be pretty accurate. The result is the resistance of your Vivi Nova head.

Mine only has 200 ohm setting too, it's 5 bucks.

Edit: Prebuilt heads do have tolerances, usually +/- 0.2 ohms. It's no cause for concern.

 

[peraspera]

Rather than battle multimeter leads I got one of these. I thought it would be faster and less error prone.
Cartomizer and Atomizer Ohm Meter