Tom Moeller, 28th Maintenance Squadron precision measurement equipment lab technician, analyzes frequencies of an Anritsu 68347C synthesized signal generator on an Agilent PSA Series Spectrum Analyzer at their building onEllsworth Air Force Base, S.D., Feb. 20, 2013. The spectrum analyzer reads frequencies that help technicians determine if the synthesized signal generator is correctly calibrated. (U.S. Air Force photo by Airman 1st Class Anania Tekurio/Released)