The AE-966 / AE-967 spectrum analysers cover a frequency band from 9 kHz to 3 GHz and allow a stable operation with span of 2 kHz/div to 3 GHz/div. The AE-966 is the basic model whereas the AE-967 includes a Tracking Generator, which turns the AE-967 into a highly useful tool for the response measurement of filters, amplifiers, attenuators and, generally speaking, any kind of radio frequency system. The Tracking Generator available in model AE-967 offers the frequency response test with the same frequency band. The RS232 interface and USB allows the connection between the unit and PC. Users can develop their own applications software.