Agilent/Keysight 70900B – Local Oscillator Module

The Agilent/Keysight 70900B is a discontinued synthesized local oscillator module and master control unit for the 70000 Series Modular Measurement System. It functions as both the LO source and system controller for spectrum analyzers, surveillance receivers, and lightwave signal analyzers. The module delivers phase noise performance of -108 dBc/Hz at 10 kHz offset, millihertz frequency resolution, and fast tuning speed that directly influences analyzer responsiveness. As the master control module, it manages system features, slave module control, command processing speed, and GPIB operation. The 70900B occupies a 2-slot width and supports MSIB, HP-IB, and manual control with downloadable program capability, limit lines, and extensive marker functions. Its open-architecture design integrates into the 70000 MMS platform, allowing mainframes and displays to be separated by up to 1.2 kilometers and operation without a display to reduce cost and space requirements.

– Technical Specifications

• Phase noise: -108 dBc/Hz at 10 kHz offset
• Frequency resolution: millihertz
• Module width: 2-slot
• Physical form: Plug-in module for 70000 Series mainframe

– Key Features

• Synthesized local oscillator with direct impact on system phase noise and frequency stability
• Master control module governing slave module operation and command processing
• MSIB, HP-IB, and manual control interfaces
• Downloadable program capability
• Limit line definition for component testing and digital radio masks
• Extensive marker capability
• Remote operation support with mainframe-to-display separation up to 1.2 kilometers
• Display-independent operation capability

– Typical Applications

• Spectrum analysis systems
• Surveillance receiver configurations
• Lightwave signal analysis
• Automatic test systems

– Compatibility & Integration

The 70900B is designed exclusively for the Agilent/Keysight 70000 Series Modular Measurement System. It functions as the system master module within the open-architecture platform, enabling integration of multiple analysis modules and custom configurations. This product is obsolete; documentation is provided for legacy system support only.