The Keithley 7158 is a 72-channel scanner card designed for signal routing in modular switching mainframes. This reed relay multiplexer (1xN configuration) enables precise channel selection and signal management across complex test and data acquisition systems. Built for integration into Keithley Series 700/7000 mainframes, the 7158 delivers fast switching action with sub-millisecond response times and maintains excellent signal integrity through low contact resistance.
Technical Specifications
Switching Architecture
• Configuration: 1xN multiplexer
• Channel count: 72
• Relay type: Reed relays
• Operate time: < 1 ms typical
• Release time: < 0.5 ms typical
• Contact resistance: 10 GΩ
Contact Ratings
• DC voltage (carry/switch): 200 VDC
• AC voltage (carry/switch): 150 VAC RMS
• Current carry: 1 A
• Current switch: 0.5 A
• DC power carry: 10 W
• DC power switch: 5 W
Environmental
• Operating temperature: 0°C to 55°C
• Storage temperature: -40°C to 70°C
• Humidity: 5% to 85% RH, non-condensing
Reliability
• Mechanical lifetime: 10⁹ operations
• Electrical lifetime (at maximum rating): 10⁶ operations
– Key Features
• High-density 72-channel architecture for multi-point signal routing
• Reed relay technology ensures minimal contact resistance and signal distortion
• Fast switching response enables dynamic test sequencing
• Exceptional insulation resistance supports high-impedance measurements
• Modular form factor integrates directly into Series 700/7000 mainframe slots
– Typical Applications
• Automated test equipment (ATE) with high channel-count requirements
• Data acquisition systems requiring flexible signal multiplexing
• Multi-point signal routing in production test environments
• Low-level signal switching in measurement applications
– Compatibility & Integration
The 7158 is engineered exclusively for Keithley Series 700/7000 switching mainframes, providing seamless integration with existing modular test systems.
