alternator ripple

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reax222

Copper - Posts: 220

Joined: March 11, 2006

Location: United States

Posted: November 01, 2008 at 6:32 PM / IP Logged

I have a fluke 117 which does frequency and I was curious if it would be able to detect alt ripple. If the battery is in good condition, I wouldn't expect it to, but if the battery was weak or failing, then would it pick up ripple as a frequency?

Because it's three phase and the mostly cut off, there wouldn't be much amplitude to the ripple. Because of the three phase, I would expect the frequency to be 1/3 of the engines rpm or pretty close. It would be a decent test for a bad diode or a poorly filtering battery?

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i am an idiot

Platinum - Posts: 13,668

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: November 01, 2008 at 6:45 PM / IP Logged

I really doubt there will be enough amplitude for the meter to pick up. If it were able to pick it up, Just looking at the size of the pulleys, I would think the alternator would turn at least twice as fast as the crankshaft.

You would probably have better luck reading AC voltage at the alternator. I am not familiar with the 117 but if it has an AC Millivolt setting you should be able to get a reading there.

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alternator ripple

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