The Keysight/Agilent/HP 44428A is a 16-channel actuator terminal block that interfaces with the Keysight 3497A Data Acquisition/Control Unit or 3498A Extender. Built around 16 mercury-wetted Form C relays, the module switches up to 1 A at 100 V peak, operating in either actuator mode for external device control or digital output mode for 16-bit wide parallel signals. Screw terminals provide external connections, and isolated Flag and Gate handshake lines support protocol handshaking. Internal excitation at +5 V or external excitation up to 100 V is available. The assembly can be configured as a 4×4 matrix and integrates with the optional 16-channel isolated digital input/interrupt assembly for independent I/O capability.
Technical Specifications
• Channels: 16
• Relay Type: Mercury-wetted Form C (single-pole, double-throw)
• Switching Capacity: 1 A maximum, 100 V peak maximum
• Circuit Protection: 1 A fused circuits, <100 VA maximum
• Excitation: Internal (+5 V, non-isolated) or external (up to 100 V)
• Operating Modes: Actuator mode or 16-bit digital output mode
• Connection Type: Screw terminals
• Operating Angle: ≤30° from vertical
• Configuration Option: 4×4 matrix
– Key Features
• Mercury-wetted relay contacts ensure reliable switching performance
• Dual operating modes accommodate power switching and digital signaling
• Isolated handshake lines provide independent control flow
• Flexible excitation allows internal or external voltage sources
• Matrix configuration supports complex switching topologies
– Typical Applications
• Test fixture power control
• Alarm actuation circuits
• General-purpose relay switching in automated test systems
– Compatibility & Integration
Direct compatibility with Keysight 3497A and 3498A modules. Optional pairing with the 16-channel isolated digital input/interrupt assembly (Option 050) enables independent bidirectional I/O.
