3656A/B/D vector network analyzers are the general names for the three products in the 3656 series vector network analyzers, corresponding to the frequency ranges of 100kHz~3GHz, 100kHz~8.5GHz and 300kHz~20GHz. The 3656 series vector network analyzers provide high-precision, high-reliability, and high-value network testing solutions, which are widely used in communications, electronics, instruments and meters, and automobiles.