Agilent/Keysight 34903A

The Keysight 34903A is a 20-channel actuator and general-purpose switch module for the 34970A and 34972A Data Acquisition/Switch Units. It has 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.