The HP/Agilent 8490D is a coaxial fixed attenuator engineered for precision signal conditioning across DC to 50 GHz. Available in six attenuation values—3, 6, 10, 20, 30, and 40 dB—it delivers stable, repeatable performance in RF and microwave systems. The 2.4 mm connector interface supports operation through 50 GHz with excellent impedance matching. Maximum input power rating of 1 W average and controlled SWR characteristics make it ideal for extending power meter dynamic range, calibration standards, and RF substitution measurements. Compact size and 50-ohm construction enable integration into benchtop and system-level applications without sacrificing reliability.
## Technical Specifications
• **Frequency Range:** DC to 50 GHz
• **Attenuation Values:** 3 dB, 6 dB, 10 dB, 20 dB, 30 dB, 40 dB
• **Impedance:** 50 Ohms
• **Maximum Input Power:** 1 W (average)
• **Connector Type:** 2.4 mm
• **Maximum SWR (3, 6, 10, 20, 30 dB models):** 1.15 to 26.5 GHz; 1.25 from 26.5–40 GHz; 1.45 from 40–50 GHz
• **Maximum SWR (40 dB model):** 1.08 to 26.5 GHz; 1.15 from 26.5–40 GHz; 1.25 from 40–50 GHz
## Key Features
• Attenuation values individually plotted on unit label (standard)
• Optional NIST-traceable calibration data available via Option UK6 or Option 890
• Calibration data includes tabulated attenuation and SWR at discrete frequencies
• Precision network analyzer testing ensures repeatable performance across full frequency span
• Compact, lightweight construction
## Typical Applications
• Signal conditioning in microwave and RF systems
• Power meter range extension for high-level measurements
• Calibration standards and RF substitution measurements
• Power level reduction to sensitive instrumentation
• Bench and system integration
## Compatibility & Integration
2.4 mm connectors ensure direct compatibility with instrumentation operating to 50 GHz. Optional designations (e.g., 8490D-003 for 3 dB) specify attenuation at purchase. Recalibration with updated test data is available.
