The Keithley 3722 is a dual 1×48 high-density multiplexer module designed for integration into Keithley 3700 and 3700A Series mainframes. It provides two independent 1×48 two-pole multiplexer banks that can be interconnected via relays to form a single 1×96 two-pole multiplexer, or isolated for independent operation and card-to-card expansion. The module supports both 2-wire and 4-wire measurement configurations, enabling flexible signal routing for automated testing and complex switching applications across up to 96 two-pole channels or 48 four-pole channels.
Technical Specifications
Switching Architecture
• Dual 1×48 two-pole multiplexer banks with relay interconnection
• Single 1×96 two-pole or 48 four-pole channel configurations
• Latching electromechanical relays with matrix drive scheme
• Relay closure memory stored on-board
• 4 ms actuation time
• Contact life: >10⁵ operations at maximum signal level; >10⁸ no-load operations
Electrical Performance
• Maximum switched signal: 300 V DC or RMS, 1 A
• Maximum carry signal: 2 A
• Power dissipation: 60 W maximum; 125 VA maximum
• Contact potential: <±1 µV (1×48); <±2 µV (1×96)
• Offset current: <100 pA
• Common mode voltage: 300 V DC or RMS to chassis
• Volt-Hertz limit: 8×10⁷
• Bandwidth: 25 MHz (1×48); 15 MHz (1×96)
• Channel resistance (EOL): <1.5 Ω (1×48); 110 channels per second
Physical Characteristics
• Signal connectors: Two 104-pin D-sub female
• Weight: 0.91 kg (2 lbs)
• Operating temperature: 0°C to 50°C
• Storage temperature: -25°C to 65°C
• Humidity: 0% to 70% RH (70% RH at 35°C maximum)
– Key Features
• Flexible configuration: operate as independent 1×48 banks or unified 1×96 multiplexer
• Bank isolation via relay control for mainframe backplane disconnection
• Low contact potential and minimal offset current for precision measurement
• High relay contact durability suitable for extended duty cycles
• Compact form factor within standard mainframe slot architecture
– Typical Applications
• Automated test systems requiring high-channel-count switching
• Multi-channel DC, AC voltage, and resistance measurement
• Signal routing in data acquisition and monitoring systems
• Parallel testing across 96 independent channels
– Compatibility & Integration
Designed for Keithley 3700 and 3700A Series mainframes. Banks interconnect via on-board relays to support card-to-card expansion and optional DMM integration through analog backplane connection relays.
