Agilent/Keysight X382A

The Agilent/Keysight X382A is a waveguide variable attenuator for X-band applications, providing precise signal attenuation from 0 to 50 dB across the 8.2 to 12.4 GHz band. This component bridges waveguide and coaxial transmission lines with minimal insertion loss and excellent impedance matching characteristics.

Attenuation is controlled by rotating a resistive card, a design that eliminates sensitivity to temperature and humidity fluctuations. The attenuator delivers ±0.2% or 0.1 dB accuracy (whichever is greater) with a maximum SWR of 1.15 and handles up to 10 W continuous-wave power. Direct-reading dials enable precise manual attenuation settings without external instrumentation.

Operational performance includes residual attenuation below 1 dB at zero setting, backlash less than 0.3 dB at maximum attenuation, and negligible phase variation across the control range. The device operates symmetrically in either direction, making it flexible for bidirectional signal paths.

– Technical Specifications

• Frequency Range: 8.2 to 12.4 GHz
• Attenuation Range: 0 to 50 dB
• Attenuation Accuracy: ±0.2% or 0.1 dB (whichever is greater)
• Maximum SWR: 1.15
• Maximum CW Power: 10 W
• Waveguide: EIA WR-90 MIL-W-85/1-077
• Flange: UG-135/U MIL-F-3922/54C-008
• Residual Attenuation: <1 dB (at zero setting)
• Backlash: <0.3 dB (at 50 dB)
• Phase Variation: Negligible

– Key Features

• Resistive card attenuation mechanism—temperature and humidity independent
• Large, easy-to-read control dials
• Bidirectional operation capability
• Low insertion loss and minimal reflections
• Direct mechanical readout—no electrical calibration required

– Typical Applications

• Microwave test and measurement systems
• Signal level control in X-band networks
• RF component characterization and calibration
• High-power waveguide circuit optimization

– Compatibility & Integration

Designed for WR-90 waveguide systems with UG-135/U flange interfaces. The X382A is an obsolete product no longer sold by Keysight but may retain operational support through available service documentation.