The Model 8444A Tracking Generator is designed to complement both Model 8554B and Model 8555A Spectrum Analyzer RF Sections. The Tracking Generator covers the frequency range of 500 kHz to 1250 MHz when used with the 8554 B RF Section and from 10 MHz to 1.3 GHz when used with the 8555A RF Section. The Tracking Generator/Spectrum Analyzer functions as a system to perform frequency response measurements. Additionally, the system can be used as a signal generator or sweeper to supply a test signal to other devices. An auxilliary output is provided for precision frequency measurements by an external frequency counter. 1-20. The Tracking Generator converts the first and third local oscillator (LO) signals from the Spectrum Analyzer RF Section, to a signal that tracks the frequency tuning of the RF Section. With the Spectrum Analyzer operating in ZERO SCAN WIDTH, the Tracking Generator is a CW signal generator, tuned to the frequency of the analyzer. In FULL or PER DIVISION SCAN WIDTH the Tracking Generator functions as a sweep oscillator which tracks the analyzer tuning. Additionally, a MANUAL SCAN control on the Tracking Generator allows manual tuning of the Spectrum Analyzer/Tracking Generator System. The amplitude of the Tracking Generator output is adjustable over a 0 to —10 dBm range by a front panel vernier control. The output level is calibrated at 30 MHz to 0 ±0.5 dBm and maintained by an automatic level control circuit. Refer to Table 1-1 for system performance specifications.