The Keysight E1421B is a C-size, 6-slot VXI mainframe power supply engineered for compact, cost-effective test system deployments. It delivers 450 W maximum usable power at 55 °C across multiple voltage rails, with comprehensive protection against over-temperature, over-voltage, over-current, and ground faults. The unit supports three input power modes – 50–60 Hz AC (100–240 Vac ±10%), 400 Hz AC (100–120 Vac ±10%), and DC (100–370 Vdc) – with automatic voltage ranging on standard AC input. Pressurized Air Channel cooling provides uniform thermal management at 60 W per slot dissipation with variable or selectable high-speed fan modes. Full VXIbus Specification Revision 1.4 compliance ensures seamless integration with VMEbus architecture, including solid-state daisy-chain jumpering for grant and interrupt acknowledge lines. Rear-panel serviceability and power input, combined with P1/P2 backplane connectors, enable flexible rack-mount or portable configurations.
Technical Specifications
Power Output
• +5 V: 45 A peak, 5 A dynamic
• +12 V: 8 A peak, 2.5 A dynamic
• –12 V: 8 A peak, 2.5 A dynamic
• +24 V: 8 A peak, 4 A dynamic
• –24 V: 8 A peak, 4 A dynamic
• –5.2 V: 40 A peak, 5 A dynamic
• –2 V: 15 A peak, 3.5 A dynamic
• Maximum usable power: 450 W @ 55 °C Electrical Input
• 50–60 Hz: 100–240 Vac ±10% (auto-ranging)
• 400 Hz: 100–120 Vac ±10%
• DC: 100–370 Vdc
• Inrush current: 40 A maximum
• Fuse protection: 15 A fast blow (15 AF) Cooling
• System: Pressurized Air Channel with variable or high-speed fan modes
• Module dissipation: 60 W per slot (10 °C rise)
• Airflow path: Right side inlet, left side exhaust – Key Features • Full VXIbus Specification Revision 1.4 compliance with ACFAIL* and SYSRESET* signal generation
• Over-temperature, over-voltage, over-current, and short-to-ground protection on all outputs; full shutdown with recovery via standby or line recycle
• Rear-panel accessibility for power input and all voltage/control signal connections
• Solid-state automatic VMEbus grant and interrupt acknowledge daisy-chain jumpering
• Standalone or rack-mounted operation – Typical Applications • Portable or fixed VXI instrumentation systems
• Automated test equipment (ATE) requiring compact mainframe architecture
• Multi-module measurement and control configurations – Compatibility & Integration The E1421B integrates with all standard VXI modules via P1/P2 backplane connectors and provides remote on/standby, ACFAIL, SYSRESET, and +5VSTDBY control signals at the rear panel.
