- The magnitude of S21 shall be less than 0,25 in the frequency range from 30 MHz to
- The magnitude of S11 shall be within the following limit ranges in the frequency range from 30 MHz to 200 MHz.
a. Upper limit 0,75 at 30 MHz and 0,55 at 200 MHz (decreasing linearly with the logarithm of the frequency)
b. Lower limit 0,6 at 30 MHz and 0,4 at 200 MHz (decreasing linearly with the logarithm of the frequency)
The CMAD is constructed of clamp ferrites, which are used in radiated emission measurements below 1 GHz to reduce compliance uncertainty. Electromagnetic characteristics of the CMAD are calibrated according to CISPR 16-1-4.
The CMAD shall be placed on cables leaving the test volume in radiated emission measurements in compliance with the latest CISPR 11, CISPR 14-1, CISPR 16-2-3, IEC 61000-6-3,
IEC 61000-6-4, and the latest medical standard IEC 60601-1-2:2014 + A1:2020 (Edition 4.1).
S11 represents CMAD input reflection coefficient at EUT side measured by Vector Network Analyzer. Standard CISPR 16-1-4 defines frequency-dependent upper and lower limits of S11 in the frequency range from 30 MHz to 200 MHz.
S21 represents the CMAD transition coefficient from EUT to the AUX side. Standard CISPR 16-1-4 defines the upper limit, which is not frequency depended and goes from 30 MHz to 200 MHz.