volt meter accuracy. Celllog 8s vs klein tools cl2000

P

poloman

10 mW
Joined
Apr 6, 2015
Messages
33
Out of interest decided to check voltage reading of my 8s pack on 2 meters against each other.

Celllog 8s | Klein tools cl 2000:
3.303v | 3.310v
3.308v | 3.309v
3.301v | 3.310v
3.300v | 3.309v
3.302v | 3.309v
3.303v | 3.310v
3.300v | 3.309v
3.300v | 3.309v

Which one should i trust? cl2000 is measuring up to 600v, so it might be not the best meter for low voltages,
what volt meter for low voltages are you using guys?
 
The CL2000 has a claimed accuracy of 0.5% over the range of 0.4-400V and given it's price-point I'd be inclined to believe it.
 
Punx0r said:
The CL2000 has a claimed accuracy of 0.5% over the range of 0.4-400V and given it's price-point I'd be inclined to believe it.
Click to expand...
so that means that Celllog 8s is not accurate and should be collaborated to cl2000 readings?
 
Reasons to own a precision voltage supply for calibrating meters...

You can get high precision voltage references for not much money ($20-$30). They're designed to give you an insanely accurate voltage reference (or several voltage references), and you can calibrate your meters based on it.
 
Some cellogs are not accurate, others not too bad. When you get one, do verify with something you feel is reasonably accurate.

But on the other hand,,, that will be the day when I fret about measuring my cells to an accuracy of .001. Some make a hobby of balancing their pack to .01v.

Personally, I get out the balancer stuff at least 4 times a year, and get my Hobby King packs balanced back to .5v The way I use them, that's all I need. So all I need is reasonable accuracy to .1v.

Your cellog is perfect, for a cellog. It's not off at all by any sensible measure. It's accurate to .01v But if you want to have a nice calming hobby, balance your cells to .001v
 
Yeah to what DM said. But if nit-picking pack balance then I’d probably trust the pro meter.

Any meter can be off and out of calibration. Just because something cost more doesn’t always insure it will be more accurate.

My experience/wisdom is founded on strength in numbers. With electronics I prefer averages over absolutes and for that you need more than 2 meters to derive useful average.

If a measurement seems odd/strange then it’s time to compare it with another meter and if those values are far enough apart, time to source more meters and start the process of computing average voltages.

CellLog (as well as iCharger) channel calibration is adjustable so if you can verify a discrepancy in voltage measurements go ahead and tweak it through the system user interface.

Another trick I sometimes do with my CellLog is to just move it up a channel or two so that #1 ground (-) begins on the next higher cell in the series string. This technique can quickly compare channels within the CellLog.
 
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