Agilent/Keysight 85685A

The Agilent/Keysight 85685A is a tracking generator module designed to integrate with 8566 and 8568 series spectrum analyzers, providing swept RF signal generation from 10 MHz to 22 GHz. It delivers precise frequency response characterization of RF and microwave components including filters, amplifiers, and attenuators through synchronized swept measurements with the host analyzer.

– Technical Specifications

Frequency and Output Performance

• Frequency range: 10 MHz to 22 GHz
• Output power range: -70 dBm to +10 dBm, adjustable
• Output power accuracy: ±1.0 dB across the primary operating range
• Output power flatness: ±0.5 dB across the full frequency range
• Output impedance: 50 Ohms
• Harmonic distortion: < -30 dBc for output levels up to 0 dBm at frequencies up to 12.4 GHz; < -25 dBc for output levels up to 0 dBm above 12.4 GHz
• Spurious output: < -60 dBc

Frequency accuracy and resolution are synchronized with and determined by the connected spectrum analyzer. Sweep timing also synchronizes with the host analyzer's sweep function.

– Key Features

• Direct integration with Agilent/Keysight 8566 and 8568 spectrum analyzer series
• Type N female RF output connector
• Fully synchronized control via spectrum analyzer interface
• Phase noise performance inherited from the host analyzer
• Powered by the host spectrum analyzer; no external power supply required

– Typical Applications

• Filter frequency response measurement
• Amplifier gain and phase characterization
• Attenuator performance evaluation
• Component insertion loss and return loss analysis across the 10 MHz to 22 GHz band

– Compatibility & Integration

The 85685A is designed exclusively for integration with:

• Agilent/Keysight 8566B and 85662A spectrum analyzer mainframes
• Agilent/Keysight 8568B and 85680B spectrum analyzer mainframes

This module operates as an internal component within compatible analyzer chassis and requires direct connection via the dedicated synchronization interface port.