Skyrc watt meter pin out help

[kdog]

I've got a little skyrc watt meter with an aux power port (so it can measure down to zero V) but try as I might I can't find any info on which pin is which. (I gather it's a simple pos/ neg only)
Does any one know? Don't want to fry it by trial and error.
Thanks
K

 

[Gregory]

Hi, I don't have first hand knowledge, but in case you don't get any other comments, here's what I would do (other than opening the box).

Measure with a DMM in continuity mode between either big black wire and the AUX pins to find ground. It is 99% likely to share a common ground. Likely to be one of the outside pins.

It is likely they are centre POS and outside NEG (like the Watts Up), as this is a standard for servo plugs, presumably so RC users can power these meters from their BEC.

 

[kdog]

Cheers Gregory
I think I will try that.

 

[docnjoj]

You should check to see if a standard 3 pin Futaba servo pin fits those 3 holes. Then measure across and see what each wire carries. Obviously don't touch the leads together on the servo pin.
otherDoc

 

[kdog]

So for anyone who might need to know
Top pin is negative ( thanks for the tip Gregory)
Middle is positive
Bottom pin... No idea.
This allows measurement below 5-6v, so I can test individual cells etc.
seems to be reasonably accurate at these low levels for example it measured 1.01v on an old nicad with a 9v aux power supply. DMM showed 1.075
Anyway thanks for the tips
K