The Keysight Z5602A Custom Accessory Family includes a series of precision power references. They are portable 50 MHz sine wave sources that require a very short warm-up.
The Keysight Z5602A Precision Power Reference can achieve the same accuracy as the calibration source built into a power meter, and mates directly with the connectors on the spectrum analyzer inputs.
The Precision Power Reference is available in three different connector types. Each Precision Power Reference has a power cable that can be directly plugged into the probe power outlet (-12.6V, +15V) on a spectrum analyzer or other instruments with the probe power feature.