The Agilent/Keysight 70311A is a synthesized frequency reference distribution module designed to generate precise clock signals within the Hewlett-Packard Modular Measurement System (MMS) platform. Operating across 16 MHz to 3.3 GHz with 1 Hz step resolution, this four-slot module delivers variable synthesized clock outputs at ±3 dBm into 50 ohm loads. Built for high-performance electronic testing and measurement applications, it provides the frequency stability and spectral purity demanded by error performance analysis and pattern generation systems.
Technical Specifications
• Frequency Range: 16 MHz to 3.3 GHz
• Frequency Resolution: 1 Hz
• Output Level: ±3 dBm
• Output Impedance: 50 ohm
• Output Connector: N-type female, AC coupled
• Frequency Stability: ±2 ppm/year (after 1 year aging); ±6 ppm over 0 to 40°C
• Harmonic Content: < -30 dBc
• Phase Noise: -75 dBc/Hz at 1 kHz offset; -115 dBc/Hz at 20 kHz offset (at 3.3 GHz carrier)
• Module Occupancy: 4 MMS slots
• User Setups: 10 non-volatile memory locations
– Key Features
• Plug-in module compatible with HP 70000 Series MMS mainframes
• No integrated display; controlled via HP-MSIB interface and associated MMS display softkeys
• Stores and recalls user-defined instrument configurations
• Recommended display: HP 70004A
– Typical Applications
Clock source for HP 71600B Series error performance analyzers and pattern generators. Suitable for any MMS system requiring variable-frequency reference distribution with high spectral purity and frequency resolution.
– Compatibility & Integration
Designed for the Hewlett-Packard Modular Measurement System architecture. Compatible with MMS mainframes equipped with suitable displays. Functions as primary frequency reference for downstream measurement and pattern generation modules.

















