Keysight Technologies E4423B Signal Generator

Keysight E4423B ESG-AP Series Analog RF Signal Generator provides stable, broadband RF output from 250 kHz up to 1 GHz for general-purpose bench testing, enabling clean sine waves and analog modulation in a compact instrument designed for rigorous RF characterization and calibration. With a 50-ohm output and a 10 MHz timebase reference, the E4423B supports precise frequency control with 0.01 Hz resolution and timing accuracy tied to the reference clock, while front-panel controls and a GPIB (IEEE-488) interface allow exact frequency stepping, level adjustment, and modulation settings. Phase offset is adjustable via either the front panel or GPIB in small increments, benefiting alignment in mixers and modulators, and the unit includes a timebase input/output (reference output) to synchronize signals across instruments on a test bench. As part of the ESG-AP family, the E4423B shares common hardware and software interfaces with related models, facilitating integration into legacy test setups, though this model is listed as obsolete on Keysight’s site, underscoring its status as a legacy analog RF generator while preserving core capabilities from 250 kHz to 1 GHz.