The HP/Agilent 84904M is a programmable step attenuator delivering precision signal control from DC to 50 GHz. It provides 0 to 11 dB attenuation in 1 dB increments, with typical repeatability better than 0.03 dB and insertion loss of 0.8 dB + 0.04 dB/GHz (DC to 40 GHz). Built on miniature thin-film attenuation cards, the module handles 1 W average and 50 W peak RF input power while maintaining low SWR across its operating band. The latching solenoid design withstands shocks exceeding 10 Gs and delivers greater than 2 million switching cycles per section (5 million typical). Compact dimensions of 8 × 6 × 4 inches and approximately 5 lbs enable straightforward integration into automated test equipment and complex instrumentation.
Technical Specifications
• Frequency Range: DC to 50 GHz
• Attenuation Range: 0 to 11 dB
• Step Size: 1 dB
• Insertion Loss (at 0 dB): 0.8 dB + 0.04 dB/GHz (DC to 40 GHz); 3.0 dB (to 50 GHz)
• Maximum SWR: 1.3 (1.3–12.4 GHz), 1.7 (12.4–34 GHz), 1.8 (34–40 GHz), 3.0 (40–50 GHz)
• Repeatability: 0.03 dB typical
• RF Input Power: 1 W average, 50 W peak
• Switching Life: >2 million cycles per section; 5 million cycles typical
• RF Connectors: 2.4 mm female or 2.4 mm male/female
• Programming Connectors: 10-pin sockets; ribbon cable or direct-solder wire options
• Solenoid Voltage: 24 Vdc (Option 024), 15 Vdc (Option 015), or 5 Vdc (Option 011)
• Shock Rating: Permanent magnet latching, >10 Gs
• Dimensions: 8 × 6 × 4 inches
• Weight: Approximately 5 lbs
– Key Features
• Miniature thin-film attenuation cards ensure high accuracy and low SWR
• Latching solenoid mechanism with permanent magnet holding requires no continuous power
• Dual connector options (2.4 mm female or male/female) for flexible RF integration
• Multiple solenoid voltage options for diverse control architectures
• Individual calibration data reports available (Option UK6)
– Typical Applications
• RF signal conditioning in automated test equipment (ATE) systems
• Microwave and millimeter-wave power level management
• High-frequency receiver and transmitter characterization
• Signal path loss compensation across broadband measurements
– Compatibility & Integration
• Integrates with Keysight 11713A/B/C attenuator/switch drivers for GPIB-controlled automatic test systems
• Compatible with Keysight 70000 modular measurement system via 70611A attenuator/switch driver
• Drive cable (11764-60004) supports GPIB connectivity to external control systems
