The Keithley 3724 is a dual 1×30 FET multiplexer module engineered for signal routing and automated testing within Series 3700A mainframe systems. This solid-state switching solution operates as two independent 1×30 two-pole multiplexers or, when banks are interconnected, as a single 1×60 two-pole multiplexer. The module supports both 2-wire and 4-wire measurement configurations and scales through card-to-card expansion for larger test systems.
## Technical Specifications
**Multiplexer Configuration**
• Two independent 1×30 two-pole multiplexers
• Single 1×60 two-pole multiplexer (via internal relay interconnection)
• 2-pole Form A contact configuration
• 2-wire and 4-wire measurement support
**Switching Performance**
• Scanning speed: >1250 channels/second (switch only)
• Actuation time: 0.5 ms
• Channel resistance (differential): <62 Ω (1×30); <64 Ω (1×60)
• Contact potential (differential): <±2 µV (1×30); <±2.5 µV (1×60)
**Signal Handling**
• Maximum switched/carried signal: 200 V DC or 141 V RMS
• Maximum switched/carried current: 0.1 A
• Power handling: 800 mW
• Common mode voltage: 300 V DC or RMS (terminal to chassis)
• Volt-Hertz limit: 10⁷
**Isolation & Crosstalk**
• Differential isolation: 10⁹ Ω, 500 pF (1×30); 10⁹ Ω, 1100 pF (1×60)
• Bank-to-bank isolation: 10⁹ Ω, 100 pF
• Channel-to-channel isolation: 10⁹ Ω, 125 pF
• Common mode isolation: 10⁹ Ω, 150 pF (1×30); 10⁹ Ω, 700 pF (1×60)
• Crosstalk (50 Ω source/load): –40 dB @ 300 kHz; –30 dB @ 1 MHz
• Offset current: <10 nA (1×10⁸ operations @ 5 V, 10 mA
## Key Features
• Flexible dual-bank architecture for independent or combined operation
• Virtually unlimited FET relay contact life eliminates maintenance
• High-speed switching enables rapid channel scanning
• Low contact potential ensures accurate low-level signal measurements
• Supports expansion for multi-card systems
• Banks isolated from mainframe backplane via relays
## Typical Applications
• Automated data acquisition and logging
• Multi-channel signal measurement and routing
• Low-level analog signal switching
• Resistance and temperature measurement in production testing
## Compatibility & Integration
The 3724 integrates with Keithley Series 3700A mainframe systems and supports card-to-card expansion for larger configurations.
