Agilent/Keysight 44428A

The Keysight 44428A is a 16-channel actuator output module purpose-built for the Keysight 3497A Data Acquisition System. It has 16 Form C (SPDT) mercury-wetted relays capable of operating in actuator mode for power switching or digital output mode for parallel logic control. Each channel independently handles up to 1 A at 100 V peak, making it suitable for fixture actuation and external device control in automated test environments.

Technical Specifications

• Relay Type: Form C (SPDT) mercury-wetted relays


• Channel Count: 16 independent channels


• Maximum Switching Voltage: 100 V (peak) per channel


• Maximum Switching Current: 1 A per channel


• Output Format (Digital Mode): 16-bit parallel digital output


• Module Composition: Main relay board with connector block

Key Features

• Dual-mode operation: actuator mode for active power switching; digital output mode for static logic levels


• Individually controllable relay channels enable selective actuation of test equipment and fixtures


• Mercury-wetted relay contacts provide reliable switching across the full voltage and current range


• 16-bit parallel output interface supports synchronized multi-channel control

Typical Applications Automated test system power distribution, test fixture relay switching, external device actuation, parallel digital control in data acquisition workflows, and multi-channel switching matrices in bench and production environments.

Compatibility & Integration The 44428A integrates directly with the Keysight 3497A Data Acquisition System. Expanded digital I/O capability is available through pairing with the 16 Channel Isolated Digital Input/Interrupt Assembly (Option 050).