The Agilent/Keysight 85660B is an RF section that extends the measurement capabilities of the 8566A and 8566B spectrum analyzers. It delivers precise frequency and amplitude characterization across an exceptionally wide range, from 100 Hz to 22 GHz, with external mixer support extending operation to 325 GHz. The unit combines exceptional sensitivity—down to −135 dBm with 10 Hz resolution bandwidth—with outstanding frequency stability and calibrated 90 dB dynamic range. Built for demanding RF signal analysis, the 85660B provides the resolution, accuracy, and stability required for detailed spectral measurements in research, development, and production environments.
– Technical Specifications
Frequency Coverage
• 100 Hz to 22 GHz (internal)
• Up to 325 GHz with external mixers
• Preselected range: 2 GHz to 22 GHz
Resolution Bandwidth
• 3 dB bandwidths: 10 Hz to 3 MHz (1, 3, 10 sequence)
• Manual or AUTO (span-coupled) selection
• Synchronously tuned, approximately Gaussian shape
Sensitivity & Dynamic Range
• −135 dBm (10 Hz RBW)
• −115 dBm (1 kHz RBW)
• Amplitude measurement range: +30 dBm to −135 dBm
• Calibrated display: 90 dB dynamic range
Frequency Stability
• Reference aging: < 1 × 10⁻⁹ per day; < 2.5 × 10⁻⁷ per year
• Temperature stability: n × 5 MHz): ±(2% of span + n × 100 kHz + reference error × center frequency)
• Frequency span (≤ 5 MHz): ±1% of indicated separation
• Frequency span (> 5 MHz): ±3% of indicated separation
• Log digitization uncertainty: ±0.2 dB (10 dB/div) to ±0.02 dB (1 dB/div)
• Error correction accuracy: ±0.4 dB
Input Characteristics
• Maximum continuous power: +10 dBm
• Maximum total RF power: +30 dBm (1 watt)
• DC voltage rating: ±7 V DC (≥ 10 dB input attenuation required)
• Spurious responses: > 70 dB below input signal
• Third-order intermodulation distortion (TOI): Typically > +5 dBm
Display & Output
• CRT monochrome display
• Log scale: 10, 5, 2, 1 dB/div options
• Linear scale: 10% of reference level/div
– Physical
• Dimensions: 16 × 14 × 10 inches (40.64 × 35.56 × 25.4 cm)
• Weight: Approximately 25 lbs (11.34 kg)
– Compatibility
• Designed for Agilent/Keysight 8566A and 8566B spectrum analyzers
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