The Keysight/Agilent 34938A is a high-power switch module for the 34980A Multifunction Switch/Measure Unit, delivering 20 independent Form A relays rated for 5 A per channel at up to 150 W. Each relay handles switching voltages to ±30 VDC or 250 VAC, with carry current capability to 8 A when closed. The module employs armature latching relays with integrated relay counter and temperature sensor for overheating protection, enabling simultaneous multi-channel switching in power cycling, indicator control, and external relay/solenoid actuation tasks. Dual 50-pin D-sub male connectors support standard twisted-pair cabling and mass interconnect solutions. Weight is approximately 1.18 kg.
Technical Specifications
• Relay Configuration: 20 × Form A (SPST) armature latching relays
• Switching Voltage: ±30 VDC / 250 VAC maximum
• Switching Current: 5 A maximum per channel
• Carry Current: 8 A (relay closed, non-switching)
• Switching Power: 150 W per channel maximum
• Module Connection: Two 50-pin D-sub connectors (male)
• Weight: Approximately 1.18 kg (2.6 lbs)
– Key Features
• Relay counter for usage tracking and maintenance planning
• Temperature sensor with thermal overload protection
• Simultaneous switching across all 20 channels
• Armature latching design for reliable contact engagement
• Dual 50-pin D-sub interface for flexible cabling integration
– Typical Applications
• Device under test (DUT) power cycling
• Indicator light control
• External power relay and solenoid actuation
• Multi-channel load switching in automated test systems
– Compatibility & Integration
The 34938A integrates directly into the Keysight 34980A mainframe and operates alongside compatible general-purpose switch modules including the 34937A and 34939A. Connection employs Keysight Y1136A (3 m) or Y1135A (1.5 m) twisted-pair D-sub cables. Terminal block kits (34938T) and solder cup connector kits (Y1139A) support diverse field wiring configurations.
