Keithley 3722 Dual 1×48 High Density Multiplexer Module

The Keithley 3722 is a dual 1×48 high-density multiplexer module designed for integration into Keithley 3700 and 3700A Series mainframes. It has 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

• 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.