Keithley 7712 3.5GHZ: Dual 1×4: 50 OHM Multiplexer Card

The Keithley 7712 is a dual 1×4 multiplexer card engineered for precision signal routing in RF and microwave test systems up to 3.5 GHz. This high-frequency electromechanical relay module delivers 50 Ω impedance matching with minimal signal loss, making it essential for automated testing platforms requiring fast, reliable channel selection across eight independently addressable paths.

## Technical Specifications

The 7712 employs dual single-pole-four-throw (SP4T) multiplexers with channels 1 and 5 normally closed to outputs A and B respectively. Actuation time is <10 ms, with contact resistance starting below 0.5 Ω and degrading to <1 Ω at end of life. Rise time is <200 ps by design; signal delay measures <1.5 ns. Maximum signal handling is 30 Vrms (42 V peak AC, 42 VDC) at 0.5 A per channel, with module power capped at 20 W and 10 W per channel. Contact potential remains 1 GΩ with 100 MΩ. Contact life is rated at 5×10⁶ cycles no-load and 1×10⁵ cycles at resistive load.

## Key Features

• Ten rear-panel SMA connectors (0.9 N·m mating torque)
• Onboard switch closure counter for maintenance tracking
• Onboard S-parameter storage for characterization data
• Cascadable architecture for matrix and multiplexer system expansion
• Compact form factor: <0.50 kg
• Operating range 0°C to 50°C, 80% RH at 35°C maximum
• EMC compliance with EN61326-1; safety per EN61010-1 CAT I

## Typical Applications

The 7712 is suited for 3G telecom testing, wireless LAN characterization, Bluetooth module validation, and general RF/microwave signal routing in automated measurement systems.

## Compatibility & Integration

Direct compatibility with Keithley 2700, 2701, 2750, and DAQ6510 mainframes enables plug-and-play integration into established data acquisition and switching ecosystems.