Agilent/Keysight X424A

The Agilent/Keysight X424A is a crystal detector for waveguide-based relative microwave power measurement in X-band systems. Operating from 8.2 to 12.4 GHz, this detector integrates into WR90 waveguide installations and delivers low-noise RF-to-DC conversion with high sensitivity suitable for precision power detection across 30 dB dynamic range.

– Technical Specifications

• Frequency Range: 8.2 GHz to 12.4 GHz (X-band)
• Waveguide Interface: WR90 flange
• Maximum Input Power: 100 mW
• Output Connector: BNC female
• Output Impedance: 15 kΩ maximum, shunted by ~10 pF
• Frequency Response Variation: ±0.3 dB across X-band
• Noise Floor: 400 µV/µW
• Sensitivity (high-level, 0.1–0.7 mW RF input): >286 mV/mW
• Optional Square-Law Loading: Model 11523A provides ±0.5 dB variation from square law over ≥30 dB dynamic range, 50 mV peak output into external load >75 kΩ
• Square-Law Temperature Stability (with Model 11523A): ~0.04 dB/°C
• Sensitivity with HP Model 11523A Load: >0.1 mV/µW

– Options

• Option 001: Matched pair configuration (order two units)
• Option 002: Optimum square-law load (HP Model 11523A)
• Option 003: Positive polarity output

– Typical Applications

X-band waveguide power measurement, radar systems, and microwave communication test and measurement setups requiring stable, linear detection across moderate power levels.