Some of EMC (Electromagnetic Compatibility) tests are performed by using RF Power Amplifiers. In order to generate required voltage or E-field levels RF signal generators are not enough. Thus, the output signal of a signal generator is amplified by an extra device: RF Power Amplifier. Some RF Power Amplifiers are embedded into signal generators and they behave as a single instrument. Most of them are external devices which have internal RF input and output ports.
The more RF power you have, the more E-field you generate!
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