The HP 3488A Switch/Control Unit with three 44474A modules is a programmable digital I/O platform for automated test systems. The 3488A mainframe accepts up to five plug-in modules and communicates via HP-IB for seamless integration into ATE environments. This configuration provides 48 total bi-directional digital lines and 12 handshake lines across three 44474A cards, each delivering 16 TTL-compatible I/O lines plus 4 control handshake lines.
Technical Specifications
• Mainframe slots: Five plug-in module positions
• Module type: Three 44474A 16-bit digital input/output cards
• I/O lines per module: 16 bi-directional, TTL compatible
• Handshake lines per module: 4 dedicated control lines
• Total configuration: 48 digital I/O lines, 12 handshake lines
• Output architecture: Open-collector outputs on I/O lines
• Addressing modes: Individual bit, 8-bit port pairs, or 16-bit word
• Control interface: HP-IB (IEEE 488) programmable
• Configuration storage: 40 complete switch configurations
– Key Features
• Flexible I/O addressing—select individual bits, dual 8-bit ports, or full 16-bit word operation
• TTL signal levels with open-collector output topology for direct logic integration
• Dedicated handshake lines enable protocol-driven communication with external devices
• Built-in self-test capability for operational verification
• Modular expansion—add or reconfigure modules to match evolving test requirements
• HP-IB programmability supports automated test sequences and remote control
– Typical Applications
• Automated test equipment (ATE) control and signal switching
• Production test systems requiring multi-channel digital control
• Benchtop automation and development testing
• External device control in high-performance measurement systems
• Digital handshake and protocol implementation in test sequences
– Compatibility & Integration
The HP 3488A accepts plug-in modules including relay multiplexers, matrix switches, VHF/microwave switches, and breadboard modules. The 3499 Switch Family provides software and firmware compatibility with the 3488A for users requiring switching solutions.
