Introduction Many microwave devices such as filters, attenuators and switches have scalar transmission responses beyond the 75 dB dynamic range of the Agilent 8757D scalar network analyzer. Greater dynamic range (> 91 dB) can be achieved using the Agilent PNA Series network analyzers. Unfortunately, vector network analyzers of this kind are relatively expensive to use. However, by using a high performance microwave signal generator in combination with a scalar network analyzer that measures both swept and CW frequencies, the valu- able benefits of economy, convenience, and extended dynamic range can be realized in one measurement system.