Measuring 60Hz/120Hz Noise Emission from PFC

[[email protected]]

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?

 

[Ken Smith]

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?

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.