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Image of Fluke 9640A RF Reference Source Calibrator

Fluke Calibration

Fluke 9640A RF Reference Source Calibrator

The Fluke 9640A RF Reference Source generates precision sine wave signals from 10 Hz to 4 GHz with output levels from +24 dBm to –130 dBm. It features an integrated leveling head that delivers direct, accurate output to the device under test, enabling metrology-grade calibration performance. The unit supports a wide dynamic range, low phase noise, and low harmonic distortion for accurate RF measurements. It is compatible with MET/CAL™ Plus software for automated calibration.

Product Info
Frequency Range 1 MHz - 4 GHz
Output Level Range -130 - +24 dBm (to 125 MHz), 14 dBm at 4 GHz (leveled)
Level Accuracy ±0.03 dB - 100 kHz, ±0.05 dB - 128 MHz, ±0.3 dB at 4 GHz
Phase Noise (typical at 1 GHz) 9640A-STD / 9640A-STD/75: -122 dBc/Hz at 10 kHz offset
9640A-LPNX / 9640A-LPNX/75: -138 dBc/Hz at 5 kHz to 100 kHz offset
Modulation AM, FM, PM (internal and external)
Included Leveling Head(s) 9640A-STD, 9640A-LPNX: 50 Ω
9640A-STD/75, 9640A-LPNX/75: 50 Ω and 75 Ω
GPIB Emulation All Models: HP3335A
LPNX Models (optional): HP8662A/HP8663A
Optional Features Integrated 50 MHz frequency counter
  • Frequency range from 1 MHz to 4 GHz
  • Output level range from -130 dBm to +24 dBm (to 125 MHz), 14 dBm at 4 GHz
  • High level accuracy (±0.03 dB to 100 kHz, ±0.05 dB to 128 MHz, ±0.3 dB at 4 GHz)
  • Low phase noise performance, with enhanced LPNX model (-138 dBc/Hz at 5 kHz to 100 kHz offset)
  • Modulation options: AM, FM, PM (internal and external)
  • “Connect once, measure many” leveling head design (50 Ω or 50 Ω/75 Ω)
  • GPIB emulation for HP3335A, optional HP8662A/HP8663A emulation for LPNX models
  • Optional integrated 50 MHz frequency counter
  • Compatible with MET/CAL software for automation
  • Suitable for calibrating spectrum analyzers, RF voltmeters, modulation analyzers, receivers, and frequency counters


SKU: FLUK-9640A