Agilent/Keysight 35660A

The Agilent/Keysight 35660A is an FFT-based dynamic signal analyzer delivering spectrum and network analysis across low-frequency electronics, mechanical, and acoustic testing domains. Dual-channel architecture with integrated signal source enables rapid characterization of filters, networks, and device frequency response. The instrument executes measurements significantly faster than swept-spectrum analyzers while maintaining superior resolution and amplitude accuracy of ±0.5 dB.

Built-in HP Instrument BASIC programming, 3.5-inch disk drive, limit testing, and data tables integrate test automation and production validation workflows without external computing infrastructure.

Technical Specifications

• Measurement Bandwidth: 244 µHz to 102.4 kHz (full range); 488 Hz to 102.4 kHz (spectrum analysis, 1-channel); 244 µHz to 51.2 kHz (network analysis, 2-channel)


• Spectral Resolution: 401 lines


• Amplitude Accuracy: ±0.5 dB


• Frequency Accuracy: ±30 ppm


• Channel Matching: Gain ±0.4 dB; Phase ±1.0 degree


• Dynamic Range: 40 dB


• FFT Windows: Force, exponential, uniform, Hann, flat top


• Alias Protection: Complete


• Digital Zoom: Yes

Key Features

• Built-in Signal Source: Random noise for linear network approximation, periodic chirp for nonlinear response testing, and fixed sine for single-frequency response validation


• Measurement Modes: Spectrum analysis, network analysis, frequency response, gain/phase, group delay, time history, power spectral density, linear and power spectrum


• Waveform Math: Conjugation, FFT, inverse FFT, square root, frequency domain integration and differentiation


• Automation: HP Instrument BASIC programming for custom test sequences, decision logic, and I/O control


• Data Management: 3.5-inch disk drive for trace, table, state, and program storage; compatible with HP Series 200/300 workstations (Option 002 removes drive)


• Limit Testing: User-definable pass/fail thresholds with point, band, and slope-based limit configuration


• Data Tables: Up to 400 X-axis entry points with automatic Y-axis value computation

Typical Applications

• Electronics: Distortion, spur level, frequency drift, and intermodulation analysis


• Mechanical: Frequency response characterization


• Acoustics and vibration testing

Compatibility & Integration HP Instrument BASIC subset supports automation, branching, and I/O control. Disk storage integrates with HP Series 200/300 workstations for extended data management.