The Agilent/Keysight 85645A is a tracking source designed to complement spectrum analyzers for swept amplitude response measurements across a wide frequency range. It delivers selectable RF output power with AC or DC coupling options, enabling high dynamic range characterization when paired with compatible host instruments. The 85645A supports offset tracking capability for measuring frequency translation devices such as mixers and systems with propagation delays. It also functions as a standalone CW signal generator, producing fixed, non-synthesized signals without requiring connection to external equipment.
Technical Specifications
• Frequency range: 300 kHz to 26.5 GHz
• RF output power: Selectable
• Coupling: AC or DC selectable
• Maximum level: +10 dB
• Minimum level: −80 dB
• Offset tracking: Supported for frequency translation devices and delayed systems
– Key Features
• Dual-mode operation as both tracking source and standalone CW generator
• Selectable RF output power for flexible measurement configurations
• AC/DC coupling selection for diverse test environments
• High dynamic range performance in paired operation with spectrum analyzers
• Fast swept measurements with compatible host instruments
– Typical Applications
• Amplitude response characterization of RF and microwave devices
• Mixer and frequency converter measurements with offset tracking
• System gain and loss measurements across 300 kHz to 26.5 GHz
• CW signal generation for bench testing and calibration
– Compatibility & Integration
The 85645A integrates with Keysight (Agilent/HP) 8560 Series and 8590 Series portable spectrum analyzers, the 8566A/B benchtop analyzer, 8340A/B synthesized sweepers, and 8350 Series sweep oscillators. The product is obsolete and no longer sold by Keysight. User and service documentation is available through authorized channels.
