Stanford Research SR785 Dynamic Signal Analyzer

The Stanford Research SR785 Dynamic Signal Analyzer is a cutting-edge, dual-channel signal analysis instrument designed to deliver exceptional performance at a competitive price. This versatile device is perfect for mechanical and electrical system analysis, making it an invaluable tool for engineers and researchers involved in servo systems, control systems, acoustics, vibration testing, modal analysis, and machinery diagnostics.

Key Features

Equipped with an array of advanced functionalities, the SR785 operates as multiple instruments in one, serving as a spectrum analyzer, network analyzer, vibration analyzer, octave analyzer, and oscilloscope. Its unique measurement architecture allows for seamless functionality as a dual-channel or single-channel analyzer, enabling users to monitor wide-band spectra while simultaneously zooming in on spectral details.

Comprehensive Measurement Groups

• FFT
• Order Tracking
• Octave
• Correlation
• Time Capture
• Time/Histogram

Specifications

• Bandwidth: DC to 102.4 kHz
• Dynamic Range: 90 dB typical, 145 dB in swept-sine mode
• Measurement Modes: FFT, Time/Histogram, Correlation, Octave, Swept-Sine, Order Tracking
• Frequency Domain Measurements: Frequency Response, Linear Spectrum, Cross Spectrum, Power Spectrum, Coherence, Power Spectral Density
• Time Domain Measurements: Time Record, Cross-Correlation, Auto-Correlation, Orbit
• Amplitude Domain Measurements: Histogram, PDF, CDF
• FFT Resolution: 100, 200, 400, 800 lines
• Memory: Up to 32 Mbyte

Input Configurations

• Number of Inputs: 2
• Full-Scale Input Range: -50 dBV to +34 dBV (2 dB steps)
• Input Impedance: 1 MΩ + 50 pF
• Max Shield Voltage: 4 Vp

Triggering and Data Capture

• Triggering Modes: Continuous, Internal, External (Analog or TTL)
• Post-Trigger: Delays up to 100,000 samples
• Pre-Trigger: Captures up to 8000 samples prior to the trigger

Advanced Analysis Capabilities

• Time Capture: Up to 2 Msamples (8 Msamples optional)
• Data Conversion Utility: Convert data to ASCII, Universal File Format, SDF, or MATLAB MAT-File Format
• Octave Analysis Standards: Conforms to ANSI standard S1.11-1986

Visual Displays and Metrics

• Displays: Single, Dual, Front/Back Overlay, Waterfall with Skew
• Marker Functions: Trace Marker, Peak Find, Harmonic Marker, Band and Sideband Marker
• Averaging Methods: RMS, Peak Hold, Linear, Exponential

Unique Features

• Curve Fit and Synthesis: 20 poles/20 zeros non-iterative rational fraction method
• Source Outputs: Sine, Swept-Sine, White/Pink Noise, Chirp

Performance Accuracy

• Phase Accuracy: ±3.0 deg (relative to external TTL trigger)
• Amplitude Accuracy: ±0.2 dB for single-channel, ±0.05 dB for cross-channel