The 8755C Analyzer Plug-in is recommended for use with the 180 "T" series displays. This plug-in processes demodulated 27.8kHz signals from the 11664 Detectors (R, A or B Models) for logarithmic display on 180 Series Oscilloscopes. Frequency range of 10MHz to 26.5GHz with measurement range of single detector signal of ? 10 dBm to -50 dBm.