Having the presence of an upline transformer with an electrostatic shield may mean that other shielded transformers would not be required in the system. However, if a shielded transformer feeds another shielded transformer, there is an effect of the attenuation ratio multiplying as shown in Figure 3. If the attenuation ratio is 100:1 in each of the transformers, the total attenuation will be 100x100=10,000:1. Obviously, cascading inherently multiplies the attenuation effectiveness of shielded transformers. The term cascading means that two or more transformers are connected in series on the same system.
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