Agilent/Keysight 85671A

The Agilent/Keysight 85671A is a software utility that transforms compatible spectrum analyzers into dedicated phase noise measurement instruments. It automates phase noise characterization across multiple offset frequencies, eliminating manual plotting and tuning procedures. The software delivers direct phase noise readouts, variable filtering with four selectable levels, integrated RMS noise calculation over user-defined ranges, and spot frequency measurements.

Data is stored in five internal trace memory registers, with hardcopy output compatible with PCL and HP-GL devices.

Technical Specifications

• Log Plot


• Spot Frequency


• RMS Noise Carrier Frequency Range (dependent on host spectrum analyzer):


• 8560E/EC: 30 Hz to 2.9 GHz


• 8561E/EC: 30 Hz to 6.5 GHz


• 8562E/EC: 30 Hz to 13.2 GHz


• 8563E/EC: 30 Hz to 26.5 GHz


• 8564E/EC: 30 Hz to 40 GHz


• 8565E/EC: 30 Hz to 50 GHz Offset Frequency Range: 10 Hz to ≤100 MHz Input Signal Level


• Maximum: +17 dBm (at Ref Level = −50 dBc/Hz)


• Minimum (optimum dynamic range): −17 dBm (at offsets ≤100 MHz, 10 dB input attenuation) Measurement Accuracy


• Amplitude Accuracy: ±2.5 dB (≥10 dB above system noise floor)


• Amplitude Repeatability: ±1.5 dB (maximum filtering, 12-point smoothing)


• Log Graph Frequency Accuracy: ±5% Filtering: 4 available levels Smoothing Options


• 12 pt (2%)


• 24 pt (4%)


• 48 pt (8%)


• 96 pt (16%) RMS Noise Calculation: Integrable over user-specified range using all, 1/2, 1/4, or 1/8 of data points Data Storage: 5 internal trace memory registers Maximum Decades: 5 (whole decades only)

Key Features

• Automated measurement eliminates manual phase noise plot generation


• Direct numerical readout of phase noise at any offset frequency via spot frequency cursor


• Four-level variable filtering controls measurement repeatability versus acquisition speed


• Integrated RMS noise calculation with results displayed in degrees or radians


• Single-offset spot frequency measurements for rapid characterization


• Five trace memory registers for data retention


• Digitized hardcopy output to PCL and HP-GL compatible devices

Compatibility & Integration Operates with Agilent/Keysight 8560 series spectrum analyzers (models 8560E/EC through 8565E/EC).