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-   -   Outlets testing at 180 hz (http://www.diychatroom.com/f18/outlets-testing-180-hz-155728/)

 Sam151 09-03-2012 06:29 PM

Outlets testing at 180 hz

I had just changed an outlet and I noticed that the new outlet and several others nearby were testing at 179.9hz I know 60hz is common, but I haven't been able to find an answer as to why some are testing higher, or if this is something I should be concerned about.

Any answers would be greatly appreciated.

 Lavid2002 09-03-2012 06:47 PM

Quote:
 Originally Posted by Sam151 (Post 1002556) I had just changed an outlet and I noticed that the new outlet and several others nearby were testing at 179.9hz I know 60hz is common, but I haven't been able to find an answer as to why some are testing higher, or if this is something I should be concerned about. Any answers would be greatly appreciated.
What's the voltage on said outlets?

 joecaption 09-03-2012 06:52 PM

Why would you even be checking for HZ?
Instead of just polarity and voltage?

 Sam151 09-03-2012 06:58 PM

Voltage is at 120.

I wasn't deliberately testing for hz, but did notice it and thought it strange. Any concerns?

 ddawg16 09-03-2012 07:00 PM

What are you using to measure the frequency?

Any chance you have a bunch of CFL's on that ckt? If so, the harmonics on from them could be making your cheap freq counter give you that freq. 180 Hz is 3x the natural freq of 60 Hz...

You would really need to look at it with an osciloscope to know for sure what is going on.

 mpoulton 09-03-2012 07:09 PM

There's something wrong with the meter. It's measuring the third harmonic for some reason. There may be nonlinear electronic loads on that circuit (like the CFL's mentioned) that are adding a third-harmonic component, but the meter should still read the main 60Hz waveform, not the minor harmonic component.

 Auger01 09-03-2012 11:24 PM

Like the other have said, you have a meter problem. Fluke is pretty much the gold standard in meters and I hear that Milwaukee is now making a good meter. You might try one of those.

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