| ratio of the power delivered to the load impedance before insertion of the filter to the power delivered to the load impedance after insertion of the filter|
Note 1 to entry: The insertion attenuation is generally expressed in decibels.
Note 2 to entry: An example of the frequency responses of a filter is shown in Figure 11. In this figure, various insertion attenuation levels are shown.
Figure 11 – Frequency response of insertion attenuation of a filter
Note 3 to entry: This entry was numbered 561-03-21 in IEC 60050-561:1991.