The Stanford Research Systems SR760 is a single-channel FFT spectrum analyzer with a frequency range extending from 476 µHz to 100 kHz and a 90 dB dynamic range. It features a 100 kHz real-time bandwidth, a 3.5-inch MS-DOS compatible floppy disk drive, and comprehensive remote interfaces including GPIB and RS-232. Built for demanding noise, vibration, and electronic measurements, the SR760 provides outstanding performance, high resolution, and extensive analysis capability.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | GPIB (IEEE-488.2), RS-232, Parallel Printer Port |
| Display | 7-inch monochrome CRT (400H x 250V graphics) |
Physical
| Parameter | Value |
|---|---|
| Power Supply | 100/120/220/240 VAC, 50/60 Hz, 60 W |
| Operating Temperature | 0 °C to 50 °C |
| Dimensions (W×H×D) | 432 mm × 159 mm × 470 mm |
| Weight | 16.3 |
Frequency
| Parameter | Value |
|---|---|
| Frequency Range | 476 µHz to 100 kHz |
| Frequency Spans | 191 mHz to 100 kHz in a 1-2-5 sequence |
| Real-Time Bandwidth | 100 kHz |
| FFT Resolution | 400 lines |
| Frequency Accuracy | ±25 ppm (0 °C to 50 °C) |
| Number of Frequency Spans | 20 |
| Frequency Temperature Stability | <5 ppm/°C |
| Frequency Clock Aging | <5 ppm/year |
Signal Input
| Parameter | Value |
|---|---|
| Number of Input Channels | 1 |
| Input Coupling | AC or DC |
| Input Configuration | Single-ended or differential |
| Input Impedance | 1 MΩ, 15 pF |
| AC Coupling Cutoff Frequency | 1 Hz (-3 dB) |
| Common Mode Rejection Ratio | 90 dB @ 1 kHz (for input range < -6 dBV) |
| Maximum Input Safety Voltage | 57 Vp continuous (100 Vp momentary) |
| Input Noise Floor | -160 dBVrms/√Hz typical (>1 kHz) |
Amplitude & Dynamic Range
| Parameter | Value |
|---|---|
| Full-Scale Input Range | -60 dBV (1 mVp) to +34 dBV (50 Vp) in 2 dB steps |
| Dynamic Range | 90 dB typical (spurious free) |
| Intermodulation Distortion | < -90 dB (two tones within span, each -6 dB from full scale) |
| Spurious Responses | < -90 dB full scale (with source or input shielded) |
| Aliasing Responses | < -90 dB full scale |
| Absolute Amplitude Accuracy | ±0.2 dB (excluding window effects) |
Measurement & Processing
| Parameter | Value |
|---|---|
| Window Functions | Blackman-Harris, Hanning, Flat-Top, Uniform |
| Measurement Modes | Spectrum, PSD, Octave Analysis |
| Octave Bandwidth Options | 1/3, 1/12 octave |
| Octave Standards Compliance | ANSI S1.11-1986 Filter Shape |
| Averaging Modes | RMS, Vector, Peak Hold |
| Averaging Types | Linear, Exponential, Peak Hold |
| Number of Averages | 1 to 65,536 (or infinite) |
| Display Units | V, V², V²/Hz, Vrms, Vrms², Vrms/√Hz, dBV, dBm, dBV/√Hz |
Triggering
| Parameter | Value |
|---|---|
| Trigger Modes | Continuous, Internal, External |
| External Trigger Input | TTL level, active high or low |
| Trigger Delay | Up to 65,536 samples (pre- or post-trigger) |
Display & Interface
| Parameter | Value |
|---|---|
| Floppy Disk Drive | 3.5-inch MS-DOS compatible, 1.44 MB or 720 KB |
| Data Export Formats | ASCII, Binary |
Power Specifications
| Parameter | Value |
|---|---|
| AC Voltage Selectable | 100 V, 120 V, 220 V, 240 V |
| AC Frequency Range | 50 Hz to 60 Hz |
Storage & Memory
| Parameter | Value |
|---|---|
| Internal Setup Storage | 9 configurations |
| Internal Trace Storage | 100 traces (non-volatile) |
Inputs & Outputs
| Parameter | Value |
|---|---|
| Printer Interface | Centronics parallel port (Epson, HP LaserJet, and PostScript compatible) |
| Video Output Connector | TTL monochrome, 18.2 kHz horizontal, 50 Hz vertical |
| External Trigger Input Impedance | 10 kΩ |
| External Trigger Level | TTL |
Performance
| Parameter | Value |
|---|---|
| Amplitude Resolution | 0.01 dB |
Communication
| Parameter | Value |
|---|---|
| RS-232 Baud Rates | Up to 19.2 kbps |
| GPIB Capabilities | SH1, AH1, T6, L4, SR1, RL1, PP0, DC1, DT1, C0, E2 (IEEE-488.2) |
Measurement Functions
| Parameter | Value |
|---|---|
| Analysis Functions | Harmonic Analysis (up to 20 harmonics), Band Analysis, Limit Testing (Pass/Fail), THD |
Marker Functions
| Parameter | Value |
|---|---|
| Marker Modes | Dual, Track Peak, Next Peak, Band, Noise, 1/X |
Signal Acquisition
| Parameter | Value |
|---|---|
| A/D Converter Resolution | 16-bit |
| A/D Converter Sampling Rate | 256 kHz |
| Anti-Aliasing Filter Type | 8-pole, elliptic low-pass |
Phase
| Parameter | Value |
|---|---|
| Phase Accuracy | ±1.0° (DC to 50 kHz), ±1.25° (50 kHz to 100 kHz) relative to external trigger |
Hardware & Connectivity
| Parameter | Value |
|---|---|
| Preamp Power Output | ±15 VDC at 100 mA (rear panel SRS connector) |
Power
| Parameter | Value |
|---|---|
| Power Consumption | 60 W |
Technology
FFT (Fast Fourier Transform)
Applications
Audio, acoustics, vibration, and noise measurements