HP / Agilent 44428A 16 Channel Actuator Output

The HP/Agilent 44428A is a 16-channel actuator output module for automated test and measurement systems. It integrates into the HP/Agilent 3497A Data Acquisition-Control Unit and 3498A Extender, delivering dual-mode switching through 16 mercury-wetted Form C relays. Each relay switches up to 1 A at 100 V peak and supports both actuator mode—for power control and device actuation—and digital output mode, providing a 16-bit wide output with bounceless switching. The module achieves single contact closure rates exceeding 27 closures/second when paired with an HP Model 9835A Desktop Computer and delivers over 10^10 switch operations with proper contact protection.

– Technical Specifications

• Channels: 16
• Relay Type: Mercury-wetted Form C (SPDT)
• Switching Ratings: 100 V peak maximum, 1 A maximum
• Contact Closure Rate: >27 closures/second (with HP 9835A)
• Switch Life: >10^10 operations with proper contact protection
• Bounceless Switching: Yes
• Frequency Response: <100 kHz (50 Ω termination, ±3 dB); ±0.3 dB (1 MΩ termination)
• Crosstalk: <30 dB at 1 MΩ termination

– Key Features

• Dual operational modes: actuator and digital output
• Individual relay control per channel
• Screw terminal external connections
• Operating orientation: ≤30° from vertical
• Weight: 1.53 lbs

– Typical Applications

Device actuation, fixture power control, alarm switching, and 16-bit digital output generation in automated measurement and test environments.

– Compatibility & Integration

Mounts directly into the 3497A or extends via the 3498A. Pairs with the 16-channel isolated digital input/interrupt assembly (44425A, Option 050) for independent input/output capability.