The Keysight 34903A is a 20-channel actuator and general-purpose switch module for the 34970A and 34972A Data Acquisition/Switch Units. It provides 20 independent SPDT latching relays with screw terminal access to normally-open, normally-closed, and common contacts. The module delivers switching capability up to 300 V, 1 A, and 50 W maximum power, making it suitable for power cycling, relay actuation, solenoid control, and indicator light management in automated test systems.
Technical Specifications
• Channel Configuration: 20 independent channels
• Relay Type: Single-Pole, Double-Throw (SPDT) latching relays
• Maximum Voltage: 300 V
• Maximum Current: 1 A
• Maximum Switch Power: 50 W
• Bandwidth: 10 MHz
• Terminal Access: Screw terminals for all relay contacts
• Breadboard Area: Included for custom circuit integration
• Unit Weight: 2.020 lbs
– Key Features
• Form C latching relay architecture provides high-integrity contacts for non-multiplexed signals
• Multiple channels can be closed simultaneously
• Does not interface with mainframe internal DMM
• External transient suppression recommended for AC line applications
• Alarm conditions on scanning modules can trigger control operations on the 34903A
– Typical Applications
• Power cycling to devices under test
• External power relay and solenoid actuation
• Status and indicator light control
• Custom switching systems integration
– Compatibility & Integration
The 34903A plugs directly into Keysight 34970A and 34972A mainframes. Software drivers support C, C#, Visual Basic, Visual Studio, Keysight VEE, and National Instruments LabVIEW. SCPI command set enables remote control and system automation.
