MMS cal cycle

Keysight recommends a 3 year cal cycle for the MMS spectrum analyzers. The aging rate for the 70310A or 70820A frequency references is 100Hz/year (assuming the oven heater is constantly powered). The spectrum analyzer self-cal (CAL ALL) routine is intended to be run daily, if the ambient temperature has changed more than 5 C, or if the UNCOR indicator is on.