The Keithley 2790-L/E is a SourceMeter Switch System that combines precision resistance measurement with integrated switching and DMM capabilities for automated test applications. Designed for low-voltage, resistance-only measurement tasks, it excels in industries requiring high-speed data acquisition and precise source control—particularly automotive testing of airbag inflators and seatbelt pre-tensioners.
## Technical Specifications
**Programmable Current Source**
• Range: 0 mA to 50 mA
• Compliance voltage: 5.5 V ±10%
• Programming resolution: 10 µA
• Accuracy: ±(0.06% + 10 µA) at 23°C ±5°C, 2-year calibration cycle
**Dry Circuit Clamp Source**
• Sourcing level: up to 1 mA
• Output voltage: 20 mV ±10%
**Resistance Measurement**
• Low resistance (<1 kΩ): Forced constant-current method
• High resistance (1 MΩ to 1 GΩ): Forced constant-voltage method
• Digital Multimeter: 6½ digit resolution with AC/DC voltage, current, frequency, and temperature measurement
**Switching Modules (7751/7752/7753)**
• Relay type: Latching electromechanical
• Actuation time: 10⁶ operations at maximum source level; >10⁸ operations in cold switching
• Contact resistance: <1 Ω at end of life
• Contact potential: 1 GΩ between terminals, <100 pF capacitance
• Configuration options: 4-channel (1 Form A) or 8-channel (4 4-pole or 8 2-pole signals)
## Key Features
• Single-module mainframe with plug-in source/switch module architecture
• Modular design supports multiple test configurations without hardware replacement
• Expandable multiplexer channels for multipin applications
• Integrated 6½ digit DMM eliminates separate instrumentation
• Latching relays enable high-cycle testing with minimal actuation delay
## Typical Applications
• Airbag inflator functional and safety testing
• Seatbelt pre-tensioner resistance validation
• Connector oxide-layer preservation during low-current testing
• Multi-channel automated test systems requiring synchronized measurements
## Compatibility & Integration
The 2790-L/E mainframe accepts Model 7751, 7752, and 7753 Source/Switch Modules, enabling single or dual inflator configurations and flexible test stand architectures.
