The Keysight/Agilent/HP E1401A is a high-power VXI mainframe designed to host 13 C-sized VXI modules in demanding test and measurement environments. It delivers stable DC power across seven voltage rails while maintaining precise thermal control through pressurized air channel cooling. The mainframe implements full VXIbus Specification Revision 1.4 and VMEbus System Specification Revision C.1 compliance, with automatic daisy-chain jumpering for VMEbus grant and interrupt acknowledge signals.
Technical Specifications
Form Factor & Slots
• C-Size VXI Mainframe with 13 module slots
• Slots on 30.48 mm (1.2 in.) centers
• J1 and J2 VXIbus backplane connectors (DIN 96-pin)
Power Input
• Input voltage: 100 VAC to 240 VAC, automatically sensed and adjusted
• Frequency range: 48 Hz to 66 Hz or 50 Hz to 400 Hz
• DC input: 100 Vdc (min.) to 370 Vdc (max.)
• Inrush current: 40 A (max.)
• Input protection: 15 A fast-blow fuse (15AF)
• Power factor corrected input section
Power Output
• +5 V: 65 A (40°C), 60 A (55°C), 9.0 A dynamic
• +12 V: 14 A (40°C), 12 A (55°C), 2.5 A dynamic
• -12 V: 14 A (40°C), 12 A (55°C), 2.5 A dynamic
• +24 V: 14 A (40°C), 12 A (55°C), 5.0 A dynamic
• -24 V: 12 A (40°C), 10 A (55°C), 5.0 A dynamic
• -5.2 V: 65 A (40°C), 60 A (55°C), 8.5 A dynamic
• -2 V: 35 A (40°C), 30 A (55°C), 4.5 A dynamic
Cooling System
• Pressurized air channel design with three mainframe circulation fans
• Dedicated fourth fan for power supply cooling
• Cooling capacity: 60 W per slot (10°C rise) to 75 W per slot (15°C rise)
• Fan speeds controlled by ambient temperature; High Speed Mode available
• Rear panel airflow inlets and outlets
– Key Features
• Solid-state automatic daisy-chain jumpering bypasses empty slots
• Over-temperature and over-voltage protection
• Rear panel accessibility for power supply and airflow serviceability
• VXIbus Specification Revision 1.4 full compliance
– Typical Applications
High-density instrument systems requiring multi-module configurations with stable multi-rail DC power distribution and active thermal management.
