The HP/Agilent 35660A is a two-channel dynamic signal analyzer delivering FFT-based spectrum and network measurements from DC to 102.4 kHz. Built for precision low-frequency characterization, it performs linear and power spectrum analysis, frequency response, gain/phase, group delay, and power spectral density measurements across electronics, mechanical, and acoustic applications. The instrument combines a 70 dBV dynamic range with noise floors as low as -140 dBV/√Hz above 1.28 kHz, achieving ±0.5 dB amplitude accuracy and ±30 ppm frequency accuracy. Dual-channel capability supports network analysis to 51.2 kHz with matched gain (±0.4 dB) and phase (±1.0°). An internal signal source generates random noise, periodic chirp, and fixed sine excitations. Automated limit testing, waveform math, data tables, and HP Instrument BASIC programming enable flexible measurement workflows. HP-IB control, onboard 3.5-inch floppy storage, and monochrome CRT display round out the platform.
Technical Specifications
• Measurement Modes: Spectrum analysis, network analysis, linear spectrum, power spectrum, frequency response, gain/phase, group delay, time history, power spectral density
• Frequency Range: 488 µHz to 102.4 kHz (single-channel spectrum); 244 µHz to 51.2 kHz (dual-channel network)
• FFT Resolution: 401 lines; minimum 244 µHz across full 102.4 kHz span
• Dynamic Range: ≥70 dBV; all distortion, harmonic, intermodulation, spurious, and alias products <-70 dB relative to full-scale input
• Amplitude Accuracy: ±0.5 dB
• Frequency Accuracy: ±30 ppm (±0.003% of frequency reading)
• Channel Match — Gain: ±0.4 dB; Phase: ±1.0°
• Input Range: +27 dBV to -51 dBV (31.7 Vpk to 3.99 mVpk), adjustable in 2 dB steps
• Noise Floor: <-130 dBV/√Hz (160 Hz to 1.28 kHz); <-140 dBV/√Hz (1.28 kHz to 102.4 kHz) at -51 dBV range, 50 Ω, 16 RMS averages
– Key Features
• Built-in signal source: random noise, periodic chirp, fixed sine
• Limit testing with user-defined upper/lower thresholds and slope acceptance bands
• Data tables for multi-point readouts without marker navigation
• Internal 3.5-inch floppy disc drive for trace, table, state, and program storage
• HP Instrument BASIC programming language onboard
• External trigger input
– Typical Applications
• Electronics characterization and distortion analysis
• Mechanical vibration and frequency response testing
• Acoustic measurement and spectral analysis
– Compatibility & Integration
• Fully HP-IB programmable for external computer control
• Compatible with HP Series 200/300 workstations for disc drive data transfer
