The Agilent 35670A is an FFT-based dynamic signal analyzer delivering simultaneous two- or four-channel analysis across a frequency range of 122 µHz to 102.4 kHz. Built for vibration, acoustics, and modal testing applications, this portable instrument combines high frequency resolution with 90 dB dynamic range and ±0.15 dB amplitude accuracy. Its modular architecture accepts options for expanded capability, including four-channel operation, order analysis, and specialized measurement functions.
Technical Specifications
Frequency and Resolution:
• Frequency range: 122 µHz to 102.4 kHz (1-channel mode); 51.2 kHz (2-channel); 25.6 kHz (4-channel with Option AY6)
• Minimum resolution: 122 µHz at 1-channel, 1600-line display
• Span: 195.3 mHz to 102.4 kHz (1-channel); 97.7 mHz to 51.2 kHz (2-channel)
• Digital zoom resolution: Up to 244 µHz within 102.4 kHz band
Dynamic Range and Accuracy:
• FFT dynamic range: 90 dB typical (≤ -80 dBfs, spurious-free, 800-line display, 50 Ω source)
• Amplitude accuracy: ±0.15 dB at 1 kHz full scale (0 dBfs)
• Channel match: ±0.04 dB and ±0.5 degrees
• Phase accuracy relative to external trigger: ±4.0 degrees (16 averages, 0 to -50 dBfs signals only)
Real-Time Performance:
• Maximum real-time bandwidth: 25.6 kHz (1- and 2-channel modes)
• Measurement rate: ≥70 averages/second (1-channel); ≥33 averages/second (2-channel); ≥15 averages/second (4-channel)
• Display update rate: ≥5 updates/second typical; ≥9 updates/second maximum
Input Specifications:
• Maximum input level: 42 Vpk
• Input impedance: 1 MΩ ±30% (floating mode)
• CMRR: -51 to -11 dBVrms across input ranges
• IEPE transducer power: 4.25 ± 1.5 mA current source
• Crosstalk: <-135 dB below signal
• A-weighting filter: Type 0 tolerance per ANSI Standard
– Key Features
• Auto-ranging input capability with 42 Vpk maximum
• Floating-mode input with high common-mode rejection
• Built-in IEPE transducer excitation for accelerometer direct connection
• Multiple resolution modes supporting 1600-line FFT displays
• Configurable channel count via modular options
– Typical Applications
• Vibration and shock analysis
• Acoustic measurement and characterization
• Modal testing and structural dynamics
• Frequency response function (FRF) measurement
• Order tracking and rotating machinery diagnostics
– Compatibility & Integration
Included options: 1C2, 1D1, 1D2, 1D3, 1D4, AN2, AY6, UFF. Option AY6 enables 4-channel simultaneous measurement.
