Measuring 60Hz/120Hz Noise Emission from PFC

Oct 27, 2005 1 Replies

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thegtwo 20 years ago

Trying to do some research to find a method for measuring the magnitude of 60Hz/120Hz noise radiating from a Power Factor Correction Assembly. Using a 2854 based PFC to feed 400VDC to buck-fed Hbridge converter that powers an amplifier.

60Hz & 120Hz spurs, that are dependent on the proximity of the PFC assembly to the buck-fed Hbridge, show on the amplifier output.

Is there a method to measure the 60hz/120hz field strength radiating from the PFC? Ideally the problem area of the PCB could be found. Some kind of basic hall effect device might work? Any advice?

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Ken Smith 20 years ago

Do you really need to "measure" as in assign numbers to, or can you work with an uncalibrated measurement.

A small coil of wire, such as an RF choke, will pick up AC fields quite nicely. If you are trying to hunt down the source of radiation, using a coil and a filtered amplifier feeding a scope or meter, will work.

Chances are, the biggest radiation at 60Hz is coming out of the inductors in the EMI blocking stuff.

-- kensmith@rahul.net forging knowledge

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