Hello Group,
I have some doubts concerning conducted emissions:
1. I'll make a hypothetical case: Let's say I have 2 electronic
equipment (they can be switched mode power supplies). Equipment A
requires 100W. Equipment B requires 3W. Let's say that my readings of
conducted emissions, collected in a receiver, are:
[EMI of equipment A at f=200kHz]=90 dBuV
[EMI of equipment B at f=200kHz]=90 dBuV
Making some calculations, I evaluate the interference voltage relative
to 90dBuV ==> EMI in volts= 31.6mV
Here begin my questions:
# This 31.6mV is a voltage that propagates on the mains wires. I
understand that the purpose of the EMC regulations (in the frequency
range of 150kHz-30MHz) is to prevent that this voltage interfere with a
radio receiver equipment or other electronic equipment. How long this
voltage propagates in the mains wires (until which distance it is
significant)??
# Is there any difference between the 90dBuV that equipment A (100W)
generates to the 90dBuV that equipment B (3W) generates (Qualitative and
quantitative)??
# This 31.6mV has a perturbing effect to the equipment A?? And to
equipment B??
# Concluding: This voltage is perturbing only for radio receivers?? Is
this the goal of the regulations imposed by the agencies (CISPR, FCC,
etc.)???
Thanks in advance for the answers
Regards
Muriel Bittencourt de Liz
Group for Conception and Analysis of Electromagnetic Devices
GRUCAD/EEL/UFSC
Florianópolis, SC
Brazil
-------------------------------------------
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.
To cancel your subscription, send mail to:
[email protected]
with the single line:
unsubscribe emc-pstc
For help, send mail to the list administrators:
Jim Bacher: [email protected]
Michael Garretson: [email protected]
For policy questions, send mail to:
Richard Nute: [email protected]
