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Voltage/Current reading negative on data-logger, and reading positive on multimeter

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Jan5-12, 12:21 PM
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1. The problem statement, all variables and given/known data
I am taking the readings of voltage/current in a small induction generator; the readings are conveyed as negative on the voltage/current sensors on my data-logger, and positive on the multimeter in both areas. When the magnet passes through the coil, and power is generated, it continues to display the reading as negative in both areas on the data-logger.

2. Relevant equations
What might be the cause for this? And what might a solution be?

3. The attempt at a solution
I have tried to establish if the cause was the wrong placement of multimeter/voltage/current sensor probes, but it was no avail.
Thank you.

2. Relevant equations

3. The attempt at a solution
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Moderator's note: thread moved to Electrical Engineering from the Engineering, Comp Sci, & Technology homework forum.

jim hardy
Jan7-12, 09:50 PM
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Voltage/Current reading negative on data-logger, and reading positive on multimeter

some definition of terms would be in order.

you have a clear mental picture of your steup
but your words do not paint a clear picture for an audience.

induction generator?
to me that means an induction motor being driven faster than synchronous speed.

magnet passes through coil?
to me that sounds like something different than an induction generator, more similar to a loudspeaker voicecoil. .

Positive and negative readings on current sensors?
to me that sounds like DC.
if i were using an induction generator i would expect power line frequency AC.

can you clarify what kind of device you are studying, and how you're going about it?

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