The Keysight 34938A is a 20-channel Form A switch module for the 34980A Multifunction Switch/Measure Unit, delivering high-density power switching and signal routing in automated test systems. Each of the 20 independent SPST relays handles 5 A continuous current and 150 W maximum power, supporting voltages to 30 VDC or 250 VAC. The module uses armature latching relays with a hardware jumper to define power-fail behavior—relays can either open or maintain state on power loss. Built-in relay counter and temperature sensor provide operational monitoring and overheating protection. Standard 50-pin D-sub connectors enable direct connection to cables, terminal blocks, or mass interconnect solutions.
Technical Specifications
• Channels: 20 Form A (SPST)
• Current Rating: 5 A per channel
• Maximum Power: 150 W per channel
• Voltage Rating: 30 VDC / 250 VAC
• Relay Type: Armature latching relays
• Operating Temperature: 0 °C to +55 °C
• Connector: Standard 50-pin D-sub
• Module Dimensions: 27 mm H × 280 mm L × 170 mm W
– Key Features
• Simultaneous switching across all 20 channels
• Relay counter for cycle tracking
• Temperature sensor with overheating detection
• Hardware jumper configuration for power-fail state definition
• 50-pin D-sub connectors with standard cable compatibility
– Typical Applications
• Power cycling of devices under test
• Control of indicator and status lights
• External power relay and solenoid actuation
• Digital output and device actuation in test automation
• General-purpose signal routing in data acquisition systems
– Compatibility & Integration
The 34938A installs directly into the Keysight 34980A mainframe. Accessory options include the 34938T Terminal Block, 50-pin M/F D-sub cables (Y1135A at 1.5 m or Y1136A at 3 m), and the Y1139A 50-pin female solder cup connector kit.
