The Racal Instruments 1261A is a 13-slot C-size VXI mainframe engineered for high-performance modular test systems. Built on the proven 1260 series platform, it delivers configurable power delivery, intelligent thermal management, and comprehensive system monitoring—available in both 7U benchtop and 9U rackmount configurations.
– Technical Specifications
Chassis Architecture
• 13-slot C-size VXI mainframe
• 7U (benchtop, rear-intake airflow) and 9U (rackmount, side-intake airflow) form factors
• 9U units feature integrated cable tray (2.25″ standard; expandable to 3.9″ or 5.6″ with optional 1U or 2U extensions)
Power Delivery
• Model 1261AM: Medium power (500W usable)
• Model 1261AH: High-power (1000W usable)
• Advanced power supply with minimal ripple and noise; backplane-direct connection
• Full protection: overvoltage and undercurrent safeguards
Cooling System
• Pressurized plenum architecture ensures even airflow distribution across all module slots
• Fault-tolerant multi-fan design maintains low temperature rise in installed VXI modules
• Basic units: HI/LO cooling switch for noise-versus-performance trade-off
• Monitor-equipped units: Variable-speed fan control based on worst-slot temperature rise; rear switch selectable maximum cooling mode
System Monitoring
• Standard Monitor System (SMS): Continuous auto-check of VXIbus voltages, currents, airflow, and temperature rise; bi-color LED status annunciators; independent power rail
• Enhanced Monitor System (EMS): SMS features plus VXIbus and RS-232 interactivity, custom limit configuration, maintenance interval logging, out-of-limit interrupt generation, and advanced trigger synchronization circuit with external connector and programmable handshake delay
Diagnostics
• Quick-check diagnostic connector for verification of power supply voltages, currents, and VXI signal integrity
– Key Features
• Configurable power options scale from medium to high-power applications
• Intelligent thermal management adapts cooling to actual system load
• Dual monitoring architectures support basic and advanced oversight requirements
• Independent monitor power rail prevents VXI slot consumption
• Rear exhaust (9U) and top exhaust (7U) airflow paths accommodate diverse installation environments
– Typical Applications
Automated test systems, modular instrumentation platforms, production test benches, and multi-instrument measurement configurations requiring flexible power delivery and temperature-critical operation.
– Compatibility & Integration
Full VXI ecosystem compatibility. RS-232 and VXIbus control interfaces (EMS). External trigger connectivity with programmable synchronization delay.
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