Do I need to perform a periodic front panel instrument alignment on my N9039A RF Preselector?

The N9039A RF Preselector itself does not have any user alignments that need to be run. However, the EMI Measurement system that this is a part of has a couple of user alignments that need to be run periodically. These alignments are accessed on the PSA by pressing Mode Setup, Align RF Presel while in the EMC Analyzer mode.

These alignments need to be run when either of the following conditions are true:

• It has been 30 days* (336 hours) since the last alignment
• The ambient temperature in which the system is being operated in has changed by 3° Celsius or more

* With N9039A software version A.02.02 or later. 5 days (120 hours) otherwise.