The Keysight 8648C is a synthesized signal generator delivering precision RF signal generation from 9 kHz to 3.2 GHz. It combines wide frequency coverage with excellent spectral purity, configurable modulation, and fast switching for laboratory and production test environments. Output ranges from -140 dBm to +13 dBm with ±0.5 dB accuracy at 1 GHz. Phase noise performance reaches -120 dBc/Hz at 100 kHz offset, while harmonic suppression exceeds -30 dBc below 1.6 GHz. The instrument supports AM modulation (DC to 100 kHz) and FM modulation (10 Hz to 100 kHz), with optional PM and pulse capabilities. Frequency resolution selects from 0.01 Hz to 10 kHz. Frequency and amplitude switching occur in under 50 ms and 100 ms respectively. Linear and logarithmic sweep modes enable flexible test automation. GPIB control interface enables system integration. Supplied with Type N female RF output connector.
Technical Specifications
Frequency
• Range: 9 kHz to 3.2 GHz
• Resolution: 0.01 Hz, 1 Hz, 10 Hz, 1 kHz, or 10 kHz (user selectable)
• Accuracy: ±1 ppm over operating temperature range
Output Power
• Range: -140 dBm to +13 dBm
• Accuracy: ±0.5 dB at +10 dBm, 1 GHz
• Flatness: ±0.5 dB typical (1 GHz to 3.2 GHz)
• Impedance: 50 Ohms
Spectral Purity
• Phase noise: <-100 dBc/Hz at 10 kHz offset, <-110 dBc/Hz at 20 kHz offset, <-120 dBc/Hz at 100 kHz offset from 1 GHz carrier
• Harmonics: <-30 dBc typical below 1.6 GHz
• Non-harmonics: 70 dB on/off ratio, <100 ns switching
Switching Performance
• Frequency: <50 ms typical
• Amplitude: <100 ms typical
Sweep Modes
• Frequency: linear or logarithmic
• Amplitude: single-step or multi-step
– Physical & Power
• Dimensions: 133 mm H × 432 mm W × 483 mm D
• Weight: 20.4 kg
• Input: 100/120/220/240 VAC ±10% (selectable), 47-63 Hz
• Power consumption: approximately 400 VA
– Interfaces
• RF output: Type N female
• Control: GPIB (IEEE-488)
