# Topic | Measuring both current and voltage

Home Forums Mooshimeter Support Measuring both current and voltage

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Anonymous
Inactive

Hello, was hoping you could show me how to set this up properly. I an trying to measure both amps and voltage of a 12v light attached to a 12v battery. Thx for the help.

Mike

Anonymous
Guest

The Solar panel demo blog post was helpful when I last tried to do that.

Anonymous
Inactive

Thx for the reply Jan, I did check that out but setting it up with my 12v light replacing the panel in the diagram I get negative amps on the meter. Any help would be appreciated.

Mike

Anonymous
Inactive

As far as i know you will end up with either a negative amp or negative voltage when you measure like that. I’m often measuring charging of motorcycle batteries, and are always getting negative amps.

But as the values are the same i don’t care. Thought about running all values through abs() to get absolute (positive) values, but that would be wrong. The way the Mooshimeter is made and the way you have to connect it to measure both amps and voltage at the same time will simply give a negative.

But. It would be relatively trivial to create a filter for uploading logs and get only abs() values. Even if that would be … well … wrong.

Anonymous
Inactive

Thx Kyrre, just wanted to make sure I was not going to ruin the meter. Hope you have a nice day.

Mike

Anonymous
Inactive

If you get negative amps with that connection example for solar panel, you can just change the leads from A –> C and C –> A.

In theory, your voltage is then measured in a slightly different point and could be (very slightly) different, but there is probably much more voltage drop on your cabling anyway.

Anonymous
Inactive

Pls forgive my lack of knowledge here, I am not seeing A or C in the solar diagram. I assume you are saying to move the AMPS lead on the meter to the COM, and COM to AMPS?

Mike

Anonymous
Inactive

@wntrhwk Yes. That’s probably what @ville is trying to say. Rotating “com to amp and amp to com” will take care of the negative values. “A” and “C” are connected in the Mooshimeter (that’s why you can measure amps) and switching the probes will alter the “direction of the current”.

the Mooshimeter will not take any damage anyway you connect A and C in this case. All (at least all i have tried) multimeters have the ability to measure with power in both directions. Adding a negative if needed. That’s the easiest way of seeing what direction the power are going. For example; it’s very useful to know the direction of the current when you are working with diodes (leds and so on).