186 
Option Esc External Source Control
Using the M1970 Series Mixers with X-Series Signal Analyzers (Option EXM)
The spectrum analyzer performs an LO alignment using a detector in the mixer to set 
the LO Power. During the alignment the yellow Busy LED turns on. Once the 
alignment completes, the mixer is ready to make calibrated measurements since the 
conversion loss values stored in the mixer are automatically loaded to the signal 
analyzer.