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Measuring 60Hz/120Hz Noise Emission from PFC

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?

Reply to
thegtwo
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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.

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kensmith@rahul.net   forging knowledge
Reply to
Ken Smith

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