To all;
Section 3.2.2(Radiated Emissions - Magnetic Fields) says:
"Radiated emissions from the EUT shall not exceed the levels of field
strength obtained from the following equation in the frequency range of
60 Hz through 30 MHz: H = E-51.5dB
In this equation, E is the electric-field intensity in dBmV/m as
obtained from Table 3-1; H is the magnetic-field intensity limit in
dBmA/m; and the constant, 51.5, is the decibel equivalent of the
free-space wave impedance of a plane wave. Extrapolation of
magneticfield intensity limits is based on the electric-field intensity
obtained from using the equations of Table 3-1 for the particular
distance greater than 3 meters. "
What is the procedure here?
1) Calculate your E-field limits depending on your measurement
distance.
2) Measure the E-Field and compare to the E-field limits.
3) Calculate your H-field limits depending on your measurement
distance.
4) Measure the H-field and compare to your limits.
I'm sure this isn't right since the H-field limits are the E-Field
limits minus 51.5 dB, so there would be no reason to re-measure the
field strength.
What am I missing here?
Questions:
Kind Regards,
Sam Wismer
Engineering Manager
ACS, Inc.
Phone: (770) 831-8048
Fax: (770) 831-8598
Web: www.acstestlab.com
