The Agilent/Keysight 35665A is a dual-channel FFT-based dynamic signal analyzer delivering comprehensive signal characterization across time, spectrum, network, and amplitude domains. Built for electronics, servo-mechanical control systems, machinery vibration analysis, and noise troubleshooting, the instrument combines modular architecture with optional firmware upgrades and specialized measurement packages to match application-specific requirements.
Technical Specifications
Frequency Performance
• One-channel mode: DC to 102.4 kHz
• Two-channel mode: DC to 51.2 kHz
• Frequency spans: 195.3 mHz to 102.4 kHz (one-channel); 97.6 mHz to 51.2 kHz (two-channel)
• Frequency accuracy: ±30 ppm
• Resolution: 100, 200, 400, or 800 lines; minimum frequency resolution reaches 244 µHz (one-channel) and 122 µHz (two-channel)
Amplitude and Dynamic Range
• Input range: +27 dBVrms to -51 dBVrms (3.99 mVpk to 31.7 Vpk manual or auto)
• Amplitude accuracy: ±2.92% of reading ±0.025% of full scale
• FFT mode dynamic range: 72 dB
• Swept-sine measurement mode dynamic range: 120 dB
• Octave mode dynamic range: 80 dB (per ANSI S1.11)
• Noise floor: < -130 dB/√Hz (160 Hz to 1.28 kHz)
• Input impedance: 1 MΩ ±10% shunted by < 100 pF
– Key Features
Measurement Capabilities
Linear and cross-spectrum, power spectral density, frequency response, time waveform, auto/cross-correlation, histogram, probability and cumulative distribution functions. Trace types include log magnitude, linear magnitude, dB magnitude, phase, real, imaginary, Nyquist, Bode, and unwrapped phase in single, upper/lower, front/back, setup, waterfall, and grid formats.
Input Coupling and Signal Conditioning
AC, DC, and ICP current source options with A-weight filtering. Integration and differentiation available via math functions. Window functions: Hann, flat top, uniform, force, exponential.
Signal Generation
Standard sources include fixed sine, random, chirp, burst random, and pink noise. Optional swept-sine (Option 1D2), arbitrary waveform (Option 1D4), periodic chirp, and burst chirp capabilities enable extended test configurations.
– Typical Applications
Electronics characterization, servo and electronic control system analysis, machinery vibration measurement, and general noise and vibration diagnostics.
