coil/atty measures .376 on one ohm meter, and .33 and .27 on another

[Vwls]

Which is correct?

What accounts for the disparity?

Could it be that these ohm meters we use are completely inaccurate?


Trident on battery ohm meter

Trident on USB ohm meter, left side

Trident on USB ohm meter, right side

HELP!

Also - side note - what is the point of having two ports on the USB meter? It's not like you can measure two atties at the same time, right?

 

[patrao_n]

Is one for voltage? Btw do yourself a favor. Get a good quality multimeter. Going that low you dont want whatever that box is you have. You cannot trust it at this point for that low of ohms.

Sent from my SM-N900T

 

[Vwls]

I have a multimeter also. That's not the point. The point is these little ohm meters we are using are crap.

 

[State O' Flux]

The point is these little ohm meters we are using are crap.

One down... (and with apogees to Robert Frost) - "miles to go before we sleep".

 

[Topacka]

I have a multimeter also. That's not the point. The point is these little ohm meters we are using are crap.

They're not crap. They're great little devices. A variance of .1 ohms between three different meters is pretty good, but you're attempting to push your battery pretty far, and in need of a more accurate device.

If you expect a 10 - 20 dollar 'ohm reader' to give you an exact and precise reading with no need for calibration, you might as well figure out how to make one, it'll be easier than finding one.

 

[Dj Xy]

.1 ohm variance on meters is actually really accurate, even for most high end multimeters that's pretty accurate.
If you short the contacts, and subtract the reading you get from the reading of your coil you'll get a more accurate measurement.

Also by looking at the pictures you posted, I see you are checking a coil with juice already on it, that could be messing with your readings as well.

 

[maxd]

I use resistance check to see:
- no shortcut
- resistance but very, very approximately - more like in 1 Ohm precision,
(for sub-ohm prefer to be more than 0.2 ohm and using 30A batteries - that is my safety)

and practically - that is it , not more

 

[darkknight187]

Calibration. No matter the cost of the meter you purchase without calibration you cannot be sure. figure most multimeter's are calibrated for a much larger range than this application uses. Given all of this I tend to agree with everybody else. A .1 variance on a 20$ device without a traceable calibration certificate is quite reasonable.

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