The Keithley 7055-A is a relay scanner card for the Model 705 Scanner mainframe, delivering flexible switching across up to 10 channels in 2-pole configuration or 20 channels in 1-pole mode. This general-purpose switching module operates as a voltage scanner, independent relay card, or matrix card, supporting break-before-make isolation and low contact potential for precision measurement applications.
## Technical Specifications
**Switching Configuration**
• 10 channels in 2-pole Form A
• 20 channels in 1-pole mode
• Matrix options: 1×10 or 2×6
**Signal Performance**
• Maximum voltage: 10 V or 15 V
• Maximum current: 10 mA or 250 mA
• Contact resistance: ≤0.12 Ω to rated life
• Contact potential: <1 µV per contact pair (copper leads); <50 µV typical
• Actuation time: 10⁹ Ω, 0 pF typical; 10 MΩ into 500 Ω @ 1 GHz
• Differential input isolation: >10⁹ Ω, 10⁹ Ω, 450 pF typical
• Common mode voltage rating: ≤50 V peak
**Reliability**
• Relay life: 10⁸ closures at maximum contact ratings
• At maximum signal levels, relay life degrades by factor of 10
## Key Features
• Break-before-make switching ensures channel isolation
• Barrier strip connections for input and output
• Compact form factor: 32 mm × 114 mm × 272 mm; 0.27 kg
• Operating temperature: 0°C to 50°C (0% to 80% RH to 35°C)
• Storage temperature: -25°C to 65°C
## Typical Applications
• Automated voltage routing and scanning
• Multi-channel relay switching for test systems
• Low-level signal matrix switching
• General-purpose switching in distributed measurement systems
## Compatibility & Integration
Designed for the Keithley Model 705 Scanner mainframe, which accepts up to two plug-in cards. Compatible with the Model 7056, 7057, 7058, and 7059 scanner cards.
