Racal Instruments 1251-14

The Racal Instruments 1251-14 is a high-density switch controller chassis within the Racal 1250 Series universal switching platform. It accepts up to five plug-in modules to build customized signal switching matrices for automated test systems. The chassis incorporates a 10-wire analog bus for inter-module communication and signal routing, enabling control across frequency ranges from DC to 26.5 GHz depending on installed switch modules. The system supports digital input/output functions through compatible modules like the 1250-14 Digital I/O card, providing control and status monitoring in demanding test environments across communications, aerospace, defense, and industrial sectors.

– Technical Specifications

• Chassis capacity: Supports up to five plug-in modules
• Inter-module bus: 10-wire analog bus for signal routing and communication
• Frequency range: DC to 26.5 GHz (dependent on populated switch modules)
• Switching capabilities: Electromechanical relay-based architecture

Example module switching ratings within the 1250 Series:
• 1260-13 DPST Switch Module: 40 independent relay channels, 2 A switching capability, 220 VDC or 250 VAC
• 1260-120 Module: Up to 13 A (AC) or 10 A (DC), maximum 125 VDC or 250 VAC, 300 W or 200 VA switching capacity

– Key Features

• Modular plug-in architecture for flexible configuration
• Digital input/output module support for external device control
• Electromechanical relay switching for high reliability
• Multi-module coordination via integrated analog bus

– Typical Applications

• Automated RF and microwave test systems
• Signal routing in aerospace and defense test environments
• Industrial and laboratory test switching matrices
• Communication system validation and characterization

– Compatibility & Integration

The 1251-14 operates within the Racal 1250 Series framework. It integrates with compatible switching modules including relay driver cards, DPST switch modules, and digital I/O modules. The system supports standard relay control commands: OPEN, CLOSE, SETUP, PSETUP, RESET, and PDATAOUT operations.