Exin EXIN EPI Certified Data Centre Specialist CDCS Question # 20 Topic 3 Discussion
CDCS Exam Topic 3 Question 20 Discussion:
Question #: 20
Topic #: 3
Given: A = attenuation in dB, R = real measured value, M = maximum acceptable value. Which formula should be used to calculate the required attenuation factor of EMF shielding material?
Attenuation is the logarithmic ratio between input and output signals. For power, we use 10 log; for voltage or current, 20 log. Since EMF shielding is measured as field strength (V/m or A/m), power relationship is proportional to the square of field. Thus the correct attenuation calculation for shielding effectiveness is:
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where:
M = maximum permissible field strength
R = measured field strength after shielding
This ensures the shield reduces field intensity to below allowable limits.
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