The Type 1L40 Spectrum Analyzer is designed as a plugin unit for use in Tektronix Type 530-, 540-, 550- and 580-' Series Oscilloscopes. It can also be used in a Plug-In Unit Power Supply (such as the Type 132 or Type 133 Power Supplies) when the analyzer is provided with either a 100 V or 150 V sawtooth signal whose base is within ±2 V of ground. When used in the above listed oscilloscopes, the analyzer displays the relative power distribution of applied signals on the CRT vertical axis as a function of frequency on the horizontal axis. Frequency coverage within the 1.5 GHz to 40 GHz range is provided by the selection of mixers2 and adapters which are listed in the accessories section of the manual. These mixers and accessories must be ordered separately as required.