Agilent/Keysight 70310A – Precision Frequency Reference Module

The Agilent/Keysight 70310A is a precision frequency reference module engineered for the Keysight 70001A mainframe and compatible 70000 series instruments. This 1-slot plug-in module delivers highly stable 10 MHz and 100 MHz reference signals through an internal ovenized quartz oscillator, phase-locked for superior long-term stability and temperature performance. The rear-panel 10 MHz input accepts external house standards or GPS-synchronized references, enabling integration with existing frequency infrastructure.

Technical Specifications

• Reference Outputs: 10 MHz, 100 MHz


• Internal Oscillator: Ovenized quartz, phase-locked configuration


• External Reference Input: 10 MHz (rear panel)


• Power Input (Primary Reference Mode): 40 V DC - maintains crystal temperature stabilization independent of mainframe power state


• Module Format: 1-slot wide plug-in


• Control Interface: MSIB (Modular System Interface Bus)


• Distribution Amplifiers: One or two independent four-output amplifiers available for 10 and 100 MHz signal distribution

Key Features

• Ovenized oscillator architecture ensures excellent frequency stability over time and temperature variations


• Phase-locked signal generation minimizes reference drift during extended measurement sessions


• Dedicated 40 V DC power path permits continuous crystal oven operation when mainframe is offline


• Multiple independent distribution amplifiers enable single-module reference distribution to multiple downstream instruments


• Option 002 configuration removes internal oscillator and power pack for cost-optimized installations dependent on external references

Typical Applications

• RF and microwave measurement systems requiring phase-coherent reference signals


• Instrumentation suites demanding rapid signal acquisition at narrow frequency spans


• Multi-instrument test benches requiring synchronized frequency references from a single source


• Systems integrating external atomic or GPS-disciplined frequency standards

Compatibility & Integration Designed for seamless integration within the Keysight 70001A mainframe and 70000 series instrument family. The module accepts external 10 MHz standards, supporting migration paths from house clocks to disciplined atomic references without hardware redesign.