The HP/Agilent 84904K is a programmable step attenuator delivering precise signal control from DC to 26.5 GHz in 1 dB increments across an 0 to 11 dB range. Built with miniature thin-film attenuation cards, this compact instrument provides exceptional repeatability better than 0.03 dB and switching times under 20 milliseconds. Its latched design with permanent magnets survives shocks exceeding 10 Gs, making it ideal for automated test systems, RF calibration, and microwave laboratory applications.
## Technical Specifications
• **Frequency Range:** DC to 26.5 GHz
• **Attenuation Range:** 0 to 11 dB
• **Step Size:** 1 dB
• **Insertion Loss:** 0.8 dB + 0.04 dB/GHz at 0 dB setting; maximum 2 dB at 26.5 GHz
• **Maximum SWR:** 1.3 to 12.4 GHz; 1.7 to 26.5 GHz
• **Step-to-Step Accuracy:** ±0.3 dB to 26.5 GHz
• **Repeatability:** Better than 0.03 dB
• **Switching Time:** Maximum 20 milliseconds including contact settling
• **RF Input Power:** 1 W average; 50 W or 100 W peak
• **Switching Cycles:** Greater than 5 million per section
• **Control Voltage:** 24 VDC (standard); 5 VDC optional (Option 011)
• **RF Connectors:** 3.5 mm female (standard)
• **Programming Interface:** 10-pin socket connector
## Key Features
• Latched design with permanent magnets rated for shock loads exceeding 10 Gs
• Compact form factor, approximately 35% smaller than the Agilent 8495/7 family
• Rugged construction optimized for system integration
• Repeatability of 0.03 dB maximum maintained over 5 million switching cycles per section
• Compatible with 3.5 mm, SMA, and 2.92 mm connectors
## Typical Applications
• Automated test equipment (ATE) systems
• RF signal calibration
• Microwave laboratory research
• Precision signal path control
## Compatibility & Integration
The 84904K integrates with Agilent 11713B/C Attenuator/Switch Drivers for GPIB, USB, and LAN control. Optional 3.5 mm male connectors and commercial calibration certificates with test data are available.
