The Keithley 2268-20-42 is an 850W programmable DC power supply for precision testing and measurement applications. It delivers up to 20V and 42A with 82% efficiency at 100VAC input and 85% efficiency at 200VAC input. This compact 1U half-rack unit achieves high power density while maintaining a minimal footprint suitable for rack integration and automated test systems.
## Technical Specifications
• **Power Output:** 850W
• **Maximum Voltage:** 20V
• **Maximum Current:** 42A
• **Efficiency:** 82% (100VAC), 85% (200VAC)
• **Input Current:** 11.5A (100VAC), 6A (200VAC)
• **Inrush Current:** <25A (100VAC and 200VAC)
• **Power Factor Correction:** 0.99 at 100VAC and 200VAC, rated output power
• **Operating Temperature Range:** 0°C to 50°C at 100% load
• **Storage Temperature Range:** –20°C to 70°C
• **Operating Humidity:** 30% to 90% relative humidity (no condensation)
• **Operating Altitude:** Up to 2000m (6500 ft)
• **Installation Category:** II (IEC 1010-1)
• **Pollution Degree:** 2 (IEC 1010-1)
## Key Features
• Front-to-back airflow design for efficient cooling without additional rack space
• Multiple control modes: constant voltage (CV), constant current (CC), and constant power
• Auto-sequence function to execute internal commands and minimize bus communication time
• Foldback mode with programmable delay to protect sensitive loads during CV/CC transitions
• Over-voltage, under-voltage, and over-current protection with programmable shutdown levels
• Over-temperature protection and hardware output interlock for unsafe condition detection
• Loop protection for coordinated multi-supply shutdown
• Two auxiliary outputs (15V and 5V) for external device control
## Typical Applications
• Automated test systems requiring isolated or non-isolated analog control
• Sensitive load testing with transition protection
• Multi-supply configurations via series or parallel connection
## Compatibility & Integration
LAN, USB, GPIB, RS-232, and RS-485 interfaces enable integration into distributed test environments. Isolated and non-isolated analog inputs support both direct control and feedback-based operation.
