The Keithley 2308 is a dual-channel portable device battery charger and simulator engineered for design validation and performance testing of battery-operated electronics. It simultaneously simulates battery discharge characteristics on one channel while providing controlled charging on the second, making it essential for mobile phone, tablet, and compact device development. The instrument delivers 50W typical power across both channels with independent voltage control, programmable output impedance for realistic battery resistance simulation, and integrated current measurement down to 100nA resolution across four selectable ranges.
## Technical Specifications
**Battery Channel**
• DC voltage output: 0 to +15VDC (±0.05% + 3mV accuracy, 1mV resolution)
• Programmable output impedance: 0 to 1.00Ω in 0.01Ω steps, changeable with output on
• DC current output: 5A maximum continuous average; sinks up to 3A to simulate discharged battery states
• Load regulation: 0.01% + 2mV; line regulation: 0.5mV
• Voltage settling time: 5ms; voltage step time: 6ms typical
• Transient response: <35µs recovery (high bandwidth), <90mV drop; <50µs recovery (low bandwidth), <180mV drop
• Remote sense: ±0 to ±8V window protection; 1V max lead drop
**Charger Channel**
• DC voltage output: 0 to +15VDC
• DC current: 5A maximum continuous; 3A sink capability
**Current Measurement**
• Sensitivity: 100nA resolution; 0.2% measurement accuracy
• Ranges: 5mA, 50mA, 500mA, 5A
• Pulse peak, average, and baseline modes; minimum pulse width 50µs
• Long integration mode: 850ms to 60 second pulse periods
• Integrating A/D converter for stable readings
## Key Features
• Dual independent channels—one for battery simulation, one for charger testing
• Variable battery impedance (0 to 1Ω) for realistic internal resistance modeling
• High-speed transient response (<35µs) for pulsed load simulation
• Multi-range current measurement with 100nA sensitivity
• 5ms output settling to specified accuracy ensures fast device transient testing
## Typical Applications
• Battery management circuit validation
• Portable device charger qualification
• Discharge profile characterization
• Pulsed current consumption analysis
• Battery-powered system performance evaluation
## Compatibility & Integration
Remote sense inputs enable integration with integrity monitoring and over-voltage/under-voltage protection schemes. Output automatically disables upon sense line excursion beyond the settable voltage window.
