The HP/Agilent 8494H is a programmable attenuator delivering precision signal level control across DC to 18 GHz. It provides 0 to 11 dB attenuation in 1 dB steps with exceptional repeatability of typically 0.01 dB (maximum 0.03 dB), making it essential for automated test systems and RF signal conditioning. Gold-plated leaf spring construction ensures durability exceeding 5 million cycles per section. The unit accepts up to 1 W average or 100 W peak RF input power and switches settings in a maximum of 20 milliseconds including contact settling.
## Technical Specifications
• **Frequency Range:** DC to 18 GHz
• **Attenuation Range:** 0 to 11 dB in 1 dB increments
• **Insertion Loss (0 dB setting):** 0.6 dB + 0.09 dB/GHz
• **Maximum SWR:** 1.5 (1.5–8 GHz), 1.6 (8–12.4 GHz), 1.9 (12.4–18 GHz)
• **Attenuation Repeatability:** Typically 0.01 dB; maximum 0.03 dB
• **Maximum RF Input Power:** 1 W average, 100 W peak
• **Switching Time:** Maximum 20 milliseconds (contact settling included)
• **Operating Life:** Exceeds 5 million cycles per section
• **Solenoid Drive:** 24 Vdc standard; 5 Vdc option available
• **Solenoid Drive Current:** Typically 125 mA (110 mA possible on older units)
## Key Features
• Precision 1 dB step attenuator with repeatable 0.01 dB typical accuracy
• Wide frequency coverage DC to 18 GHz for broadband applications
• Robust gold-plated leaf spring contacts rated for extended operational life
• Low insertion loss of 0.6 dB at 0 dB setting
• Fast switching: 20 milliseconds maximum
• High power handling: 100 W peak input capability
## Typical Applications
• Automated RF test and measurement systems
• Signal conditioning and level adjustment in microwave systems
• Dynamic range extension in measurement chains
• Repeatable attenuation control in characterization setups
## Compatibility & Integration
• RF connectors: Type-N female, SMA female, or APC-7
• Programming: Standard 12-pin Viking connector or optional 14-pin DIP plug with ribbon cable
• Cascadable with Keysight/Agilent 11716A/B/C interconnect kits for increased dynamic range
• Compatible with HP 11713A, 87130A, and HP 70611A drivers for HP-IB automated control
