The Tektronix 1L40 is a spectrum analyzer plug-in for 500-series scopes. It covers the frequency range from 1.5 GHz to 40 GHz.
The front-end mixer of the 1L40 is a removable module. By default the 1L40 comes with a coaxial mixer, Tek part number 119-0096-00, which works up to 12.4 GHz. The 119-0096-00 contains a 1N415D detector diode.
Type 1L40 was produced for only 3 years, making it the shortest-lived letter-series plug-in.
- 12.4 GHz to 18 GHz requires the 119-0097-00.
- 18 GHz to 26.5 GHz requires the 119-0098-00.
- 26.5 GHz to 40 GHz requires the 119-0099-00.