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SRS Labs SR785 manual

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Table of contents for the manual

  • Page 1

    SR785 T wo Channel Dynamic Signal Analyzer SRS STANFORD RESEARCH SYSTEMS[...]

  • Page 2

    SR785 T wo Channel Dynamic Signal Analyzer $11,950 (U.S. list) Features ● FFT , Correlation and Order T racking Measurements ● ANSI Standard 1/1, 1/3, 1/12 Octave Analysis ● Swept-Sine Mode (145 dB dynamic range) ● 20-pole/20-zero Curve Fit and Synthesis ● Time/Histogram Mode ● Windows95 ¨ DataViewer ● Output to SDF ¨ , MA T ¨ , UF[...]

  • Page 3

    F ast Responsive Mark er • Find Max/Min or track peaks • THD, THD + N • Band, sideband, harmonic power • Waterfall • Frequency and damping • Peak find • Absolute and relative • Statistics Input Channels • Dual ADCs provide 102.4 kHz bandwidth on both channels simultaneously. • -50 dBV max full scale input sensitivity • Built-i[...]

  • Page 4

    SR785 T wo Channel Dynamic Signal Analyzer FFT Spectrum Analysis The SR785 Two Channel Dynamic Signal Analyzer is a precision, full-featured signal analyzer that offers state-of-the-art performance and a wide selection of features at a price that's less than half that of competitive analyzers. Building on its predecessor, the SR780, the SR785 [...]

  • Page 5

    View order maps or track individual orders with the SR785. Run-up and run-down measurements in both polar and bode formats are available. time record, 1000 averages take exactly 4 seconds, during which the SR785 still operates at its maximum display rate. For impact testing, the average preview feature allows each time record or spectrum to be acce[...]

  • Page 6

    provided to monitor variations of RPM as a function of time. And a complete selection of time and RPM triggering modes is included allowing you to make virtually any rotating machinery measurement. Swept-Sine Measurements Network analysis using FFT mode produces fast results but suffers from limited dynamic range and frequency resolution. Swept-sin[...]

  • Page 7

    Top display shows the burst noise source. Bottom display shows an arbitrary waveform downloaded to the SR785 via the IEEE-488 interface. Top display shows a histogram of time data. Bottom display shows the cumulative density function. user-defined thresholds are measured with high frequency resolution, while small changes are measured using wider f[...]

  • Page 8

    Two 2k deep waterfall buffers ensure you’ll never miss important waterfall data. The SR785 doesn’t limit you to a few preselected measurements. With user math you can create an infinite variety of measurements. Wa t e r f a l l Waterfall plots are a convenient way of viewing a time history of your data. Each successive measurement record is plo[...]

  • Page 9

    Output The SR785's built-in 3.5" 1.44 MB disk drive, GPIB and RS-232 computer interfaces and Centronics printer port combine to allow almost unlimited flexibility in saving, printing, plotting or exporting your measurement data. Displays and setups can be printed or plotted to disk, GPIB, RS-232 or Centronics port in PCX, GIF, PCL (LaserJ[...]

  • Page 10

    The SRS DataViewer Windows utility enables you to view SR785 data files graphically and save them in different formats. DataViewer The SRS DataViewer is a Windows 95 program that allows you to quickly upload SR785 files into a graphical environment, perform simple editing and cut and paste into other applications. You can add pointers and text, cha[...]

  • Page 11

    SR785 Specifications Specifications apply after 30 minutes of warm-up and within two hours of last auto-offset. All specifications are with 400 line FFT resolution and anti-alias filters enabled unless stated otherwise. Measurement Groups Standard Groups FFT analysis, Correlation, Time Histogram, Swept Sine Optional Group Order Tracking Frequency R[...]

  • Page 12

    Flatness <0.25 dB pk-pk (typical), <1.0 dB pk-pk (max), 5000 rms averages Pink Noise Source Bandwidth DC to 102.4 kHz Flatness <2.0 dB pk-pk, 20 Hz - 20 kHz (measured using averaged 1/3 octave analysis) Chirp Source Time Record Continuous or Burst Output Sine sweep across the FFT span Flatness ±0.25 dB, 1.0 Vpk Swept Sine Source Auto Func[...]

  • Page 13

    SR785 Features Instrument 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 Histo[...]

  • Page 14

    1290 D Reamwood Avenue ¥ Sunnyvale, CA 94089 Telephone (408)744-9040 ¥ FAX: (408)744-9049 Email: info@srsys.com ¥ WWW: www.srsys.com Printed in USA ©1998 Stanford Research Systems, Inc. All specifications and prices subject to change (1/98) All trademarks are the property of their respective owners. SRS STANFORD RESEARCH SYSTEMS Ordering Inform[...]