Agilent/Keysight 909D

The Agilent/Keysight 909D is a precision 50-ohm coaxial termination load designed for high-frequency calibration and measurement applications. It has a low-reflection, matched load across a wide frequency band, serving as an essential calibration standard for coaxial instrumentation and broadband test systems.

Technical Specifications

Frequency Range: DC to 26.5 GHz (mode-free operation to 34 GHz) Impedance: 50 Ohms Connector: 3.5 mm APC male (standard); 3.5 mm female available (Option 011); improved accuracy 3.5 mm male available (Option 040) Return Loss Performance:

• Maximum SWR 1.02 at 3 GHz


• Maximum SWR 1.036 at 5 GHz and 6 GHz


• Maximum SWR 1.12 at 26.5 GHz


• Typical VSWR 1.1 at 26.5 GHz Power Handling:


• Maximum average power: 2 W


• Maximum peak power: 100 W (10 ps pulse width maximum)


• Derated to 1 W average at 75 °C Physical Dimensions: 23 mm length × 4 mm diameter

Key Features Precise impedance matching across the DC to 26.5 GHz band with excellent return loss characteristics enables accurate system characterization and instrument calibration. The compact form factor and multiple connector options provide flexibility in laboratory and field applications. Operating temperature range of 15 °C to 35 °C with non-condensing humidity control maintains measurement accuracy. Storage capability from –40 °C to +75 °C supports extended instrument lifecycles.

Typical Applications

• Calibration standard for 50-ohm coaxial systems


• Broadband measuring instrument accessories


• Terminating loads for coaxial instrumentation


• Network analyzer and RF test system calibration

Compatibility & Integration The 909D interfaces with standard 3.5 mm coaxial connectors. Annual calibration or recalibration after 1000 connector mating cycles maintains traceability. Periodic connector inspection and cleaning preserves electrical performance.