The Racal 1256 is a high-performance switching system mainframe designed for automated test equipment (ATE) applications. This compact 2U rack-mountable platform integrates multiple switching and digital I/O functions through the modular Adapt-a-Switch™ plug-in system. With Ethernet 10/100, GPIB, and RS-232 interfaces, it supports remote control and network connectivity for distributed test environments. The 1256 delivers scanning speeds exceeding 100 channels per second and relay switching that closes or opens more than 200 channels in less than 0.1 second, enabling rapid test cycles with minimal downtime.
Technical Specifications
Architecture
• 8-slot modular mainframe (1256L variant: 12 slots)
• Compatible with Racal Adapt-a-Switch™ 1260-100 Series plug-in modules
• Non-volatile memory stores up to 100 complete switch states plus automatic power-up state
• Automatic restoration of RS-232 baud rates, GPIB address, display settings, module names, and path names
Interfaces
• Ethernet: 10/100 connectivity for remote control
• GPIB: IEEE 488.2 compliant
• RS-232: SCPI compliant
• Front panel: Display, four soft-keys, rotary knob, system power indicator, LAN status indicator, system reset, USB Type A
Switching Performance
• Scanning speed: >100 channels per second
• Relay switching speed: >200 channels in <0.1 second
• High current capability: Up to 13 A
• High voltage capability: Up to 1 kV
• RF/Microwave: Up to 18 GHz
– Key Features
• Single mainframe configurations support:
– 1152-point matrix
– 512-channel scanner/multiplexer
– 640 SPST switches
– 768 channels of TTL, CMOS, or open-collector digital I/O
• Extended capacity on 1256L:
– 4×432 matrix
– 768-channel multiplexer
– 960 SPST channels
– 120 1×4 RF multiplexers
• Plug-in options include 1260-138A 8x(1×8) multiplexers and 160E high-density microwave SPDT switches
– Typical Applications
• Automated production and functional test
• Signal routing in multipoint measurement systems
• RF/microwave device characterization
• High-current and high-voltage switching applications
• Digital I/O control in laboratory and industrial environments
– Compatibility & Integration
The 1256 accepts the complete Adapt-a-Switch™ module family, allowing configuration flexibility from simple multiplexing to complex matrix and RF switching architectures. GPIB and Ethernet interfaces enable integration into existing ATE infrastructures and network-based test systems.
