Phase reference standard Precision calibration phase reference standard for the PNA-X nonlinear vector network analyzer Flat amplitude and phase NIST referenced phase calibration Specifications Output frequency: 10 MHz to 110 GHz Input frequency: 10 MHz to 6 GHz 1, 2, 4, 8, 16, 32, 64 or 128 divide ratio USB Interface Plug-and-play operation with the PNA-X nonlinear vector network analyzer Easy frequency divider control and calibration data retrieval Fast calibration data retrieval Durability Rugged connectors High repeatability throughout multiple connects and disconnects Long operating life Industry-1st phase calibration standard comb generator for precision nonlinear measurements The Keysight Technologies, Inc. U9391M comb generators were developed to provide precision phase calibration, for non-linear measurements using the PNA-X nonlinear vector network analyser (NVNA), referenced to the National Institute of Standards and Technology (NIST) standard. Additionally, the comb generators can be used to calibrate PNA and PNA-X network analyzers for phase and delay measurements of frequency converters without requiring reference or calibration mixers. Keysight's new comb generator offers a customer selectable USB controlled frequency divider which allows for broad range of input signal frequencies from 10 MHz to 110 GHz and small minimum tone spacing of 10 MHz. The input power and fundamental frequency have lower sensitivity than other comb generators. So you can calibrate the comb generator at a single input power level and frequency and then successfully apply the calibration across a wide range of input powers and fundamental frequencies.