Agilent/Keysight 34931A

The Keysight 34931A is a dual 4×8 armature matrix module for signal routing and switching within the 34980A Multifunction Switch/Measure Unit mainframe. It delivers 64 2-wire cross-points using latching armature relays, enabling flexible connections between test equipment and devices under test in automated measurement systems. The module supports multiple configuration options and integrates with the mainframe's internal DMM for voltage and resistance measurements.

Technical Specifications

• Matrix Configuration: Dual 4×8 arrangement; supports dual 4×8, 8×8, or 4×16 configurations


• Cross-points: 64 2-wire cross-points total; 32 per matrix


• Relay Type: Latching armature relays


• Maximum Switch Voltage: ±300 V


• Maximum Switch Current: 1 A


• Carry Current Rating: 2 A


• Analog Bus Voltage: Up to 300 V


• Scan Rate: 100 channels per second


• Connectors: 50-pin D-sub

Key Features

• Simultaneous input and output connections with any cross-point combination


• Hardware safety interlock protection for modules connected to internal DMM


• Expandable architecture supports up to 512 2-wire cross-points per mainframe via external linking


• Matrix 2 connects to Analog Buses; Rows 5 and 6 interface internal DMM through dedicated channels (921, 922)


• Unique channel numbering per cross-point based on row/column intersection


• Relay counter function included


• Four 2-wire analog buses for external expansion


• Channel resistance may increase after extended inactivity; 2K relay cycles recommended before use

Typical Applications

• Automated test and measurement systems requiring signal routing


• Multi-point voltage and resistance measurement campaigns


• Device characterization with flexible matrix switching


• Production test environments demanding high scan rates

Compatibility & Integration Designed exclusively for integration within the Keysight 34980A mainframe. Multiple 34931A modules can be cascaded internally or externally via Analog Buses to expand switching capacity. Terminal block and mass interconnect solutions are supported through standard 50-pin D-sub connectors.