The Agilent/Keysight 8644B is a high-performance signal generator spanning 0.252 MHz to 1030 MHz (2060 MHz with Option 8644B-002). It delivers exceptional spectral purity with SSB phase noise of -136 dBc/Hz at 20 kHz offset and nonharmonic spurious levels below -105 dBc, making it ideal for precision receiver testing and signal simulation across R&D, manufacturing, and service environments.
Technical Specifications
Frequency & Output
• Frequency range: 0.252 MHz to 1030 MHz standard; up to 2060 MHz with Option 8644B-002
• Output level: +16 dBm to -137 dBm with ±1.0 dB accuracy (outputs ≥ -127 dBm)
• Resolution: 0.01 Hz
• Electronic attenuator uses solid-state components for consistent ±1.0 dB accuracy
Spectral Performance
• SSB phase noise: -136 dBc/Hz at 20 kHz offset at 1 GHz
• Nonharmonic spurious: < -105 dBc up to 1 GHz
Modulation Capabilities
• Internal modulation synthesizer to 400 kHz
• Waveforms: Sine, square, triangle, sawtooth, white Gaussian noise
• Two-tone capability for complex signal simulation
• AM/FM standard; wideband FM to 5 MHz (2 MHz deviation) or 800 kHz (10 MHz deviation above 1500 MHz)
• Pulse modulation available (Option 8644B-008): rise/fall times 80 dB, pulse width and delay 50 ns to 999 ms
• DC-coupled FM for low carrier drift measurements
Timebase & Stability
• High-stability oven-controlled timebase standard
• Aging: ±1.5 × 10⁻⁸/day after 10 days
• Temperature stability: ±7 × 10⁻¹⁰ across 0 to 55 °C
• Option 8644B-001 adds EFC (Electronic Frequency Control)
– Key Features
• YIG oscillator architecture provides excellent FM linearity
• Internal frequency counter option (8644B-011) extends counting to 2 GHz
• Optional low-noise configuration (8644B-004)
• Reduced leakage option available (8644B-010)
• VOR/ILS signal simulation support (8644B-009)
– Typical Applications
Receiver performance validation, modulation testing, two-tone intermodulation studies, pulse signal characterization, wideband FM system evaluation, and navigation aid signal simulation.
– Compatibility & Integration
Front panel and optional rear panel connectors support modulation inputs, RF outputs, and frequency counter interfaces. Physical footprint: 177 mm H × 426 mm W × 624 mm D; 30 kg.
