Agilent/Keysight E8408A

The Agilent/Keysight E8408A is a C-size, 4-slot VXI mainframe engineered for demanding test and measurement applications requiring compact form factor and field portability. This fully VXIbus Specification Rev 1.4-compliant platform delivers 175 W of usable power across its four slots, with integrated thermal management and comprehensive mainframe monitoring for extended operational reliability.

Technical Specifications

• VXI mainframe: C-size, 4 slots


• Usable power: 175 W (0–40°C); derates to 150 W (40–50°C) and 125 W (50–55°C)


• Input voltage: 90–264 Vac


• Power supply protection: over-temperature, over-voltage, short-to-ground, short-to-other-output Backplane Voltages


• +5V: +4.875V to +5.125V


• +12V: +11.64V to +12.6V


• −12V: −12.6V to −11.64V


• +24V: +23.28V to +25.2V


• −24V: −25.2V to −23.28V


• −5.2V: −5.46V to −5.044V


• −2V: −2.1V to −1.9V Thermal Management


• Two-speed fan with full-speed automatic and variable-speed temperature-compensated modes


• Rear-panel airflow entry; left-side exhaust (horizontal orientation)


• Rack mounting clearance: 50 mm rear and left side Backplane Architecture


• Solid-state automatic daisy-chain jumpering for VMEbus grant and interrupt acknowledge lines


• Full differential CLK10 distribution for minimized jitter and skew


• Surface-mount construction for signal integrity


• SYSRESET and ACFAIL generation per VMEbus and VXIbus specifications

Key Features

• Compact 3U height (133.3 mm) with lightweight design optimized for portable and space-constrained installations


• Real-time front-panel monitoring: power supply voltages, temperature, and fan status


• Dual-mode fan control switches: Full Speed and Variable Speed operation


• Rear-accessible power supply and cooling fan for in-rack maintenance without chassis removal


• Surface-mount backplane design enhances signal performance and reliability

Physical Specifications

• Width: 362 mm (14.3 in.)


• Depth: 540 mm (21.3 in.)


• Height: 133.3 mm (5.25 in.)


• Weight: 8 kg

Compatibility & Integration Fully compliant with VXIbus Specification Rev 1.4 and VMEbus standards. Supports any VXI module within the 175 W power envelope and thermal limits across all four slots.