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RSS FeedSR780 Two Channel Dynamic Signal Analyzer
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An FFT network analyzer that combines high performance, low cost, and allthe features you need without forcing you to buy an array of expensiveoptions. The SR780 offers it all: 102.4 kHz dual channel FFTs with 90 dBdynamic range, 145 dB dynamic range swept-sine measurements, realtime ANSIstandard octave analysis, waterfalls, transient capture, and more, forless than half the cost of other similarly equipped analyzers.
The SR780's advanced architecture gives you two analyzers in one box. Youcan configure each display with separate spans, center frequencies, oraveraging configurations. The "link" key lets you change parameters forboth displays together or separately with a single keypress.
Whether your application involves acoustic measurements, vibrationtesting, servo systems, or filter design, the SR780's features,performance, and low cost make it the overwhelming choice in FFT networkanalyzers.
Spectrum Analysis
The SR780 delivers true 2-channel 102.4 kHz FFT performance. Unlike otheranalyzers, the SR780 doesn't make you sacrifice 2-channel performance forbandwidth - its fast 32-bit floating point DSP processor gives the SR780 afast 102.4 kHz realtime rate with both channels selected. Two precision16-bit ADCs provide a 90 dB typical dynamic range in FFT mode - enough forthe most demanding low-level measurements. Selectable 100 to 800 lineanalysis optimizes time and frequency resolution and you can zoom in onany portion of the 102.4 kHz range with a frequency span down to 191 mHz.
The SR780's unique architecture lets the two displays function as separateanalyzers. You can choose separate frequency spans, starting frequencies,number of FFT lines, or averaging modes for each display. So it's noproblem to look at a wideband display and zoom in on a specific featuresimultaneously. No other spectrum analyzer lets you select from twosampling rates: 256 kHz or 262 kHz, so frequency spans come out in eithera binary (102.4 KHz, 51.2 kHz,...) or decimal (100 kHz, 50 kHz, 25kHz,...) sequence depending on your requirements.
Flexible Averaging
Enough averaging choices are provided for any measurement. Choose rmsaveraging to reduce signal fluctuations, or vector averaging to actuallyeliminate noise from synchronous signals. Choose linear averaging (stableaveraging) for fixed signals, or exponential averaging to track driftingfeatures. Because the SR780's 102.4 kHz realtime bandwidth lets it takedata seamlessly, vector averaging can be selected for any signal that'srepetitive within the time record - no trigger is necessary.Automatic Unit Conversion
Automatic unit conversion makes translating accelerometer data easy. Enteryour accelerometer conversion directly in V/EU, EU/V or dB(1V/EU). TheSR780 will display results in units of meters, inches, mil, g, kg, lbs, N,dynes, pascals, bars, or dBSPL. Accelerometer data is automaticallyconverted to velocity or displacement units. Built-in ICP power means youwon't have to take along an external power supply for your accelerometer.Octave Analysis
Realtime octave analysis at frequencies up to 40 kHz (single channel), or20 kHz (2-channel) is standard on the SR780. Octave analysis is fullycompliant with ANSI S1.11-1986 (Order 3, type 1-D) and IEC 225-1966. 1/1octave, 1/3 octave, and 1/12 octave analysis are all available. Switchableanalog A-weighting filters as well as built-in user math A, B, andC-weighting functions are all included. Octave averaging choices includeexponential time averaging, linear time averaging, peak hold, and equalconfidence averaging. IEC 651 Type 0 compliant peak hold, impulse, fast,and slow sound level measurements are all calculated.Swept-Sine Analysis
Swept-sine analysis for measurements involving high dynamic range or widefrequency intervals is also a standard feature of the SR780. Selectableauto-ranging optimizes the input range at each point in the measurement,providing up to 145 dB of dynamic range. Auto-ranging can be used withsource auto-leveling to maintain a constant input or output level at thedevice under test. To ensure the fastest sweeps possible, auto-resolutioncan also be selected, providing a variable scan speed tailored preciselyto the signal being measured. Choose linear sweeps for high frequencyresolution or logarithmic sweeps up to 8 decades for the widest frequencycoverage.User Math
All three measurement groups: FFT, octave, and swept-sine, allow you tocreate your own measurement using the SR780's user math menu. Enter anyequation involving time or frequency data, stored files, constants, or arich array of supplied operations including the arithmetic functions, FFT,inverse FFT, jw, d/dw, exp, ln x and many others. Unlike many analyzers,the SR780 doesn't slow to a snail's pace when user math is selected. Forinstance, the function exp(ln(conj(Average(FFT2/FFT1))) can be calculatedwith a 50 kHz realtime bandwidth.Source
Choose from one of 5 precision source types: low distortion (-80 dBc)single or two-tone sine waves, chirps, white noise, pink noise, orarbitrary waveforms. The chirp and noise sources can both be bursted toprovide a source that's active only over a selected portion of the timerecord for FFT measurements, or to provide an impulsive noise source foracoustic measurements. The digitally synthesized source provides outputlevels from 0.1 mV to 5 V and delivers up to 100 mA of current.
Arbitrary waveform capability is standard on the SR780. Use the arbitrarysource to playback a section of a captured waveform, play a selected FFTtime record, or upload your own custom waveform from disk or over theremote interface.
Capture
The SR780 comes with 2 Msamples of standard capture memory. Waveforms canbe captured at 262 kHz or any submultiple of 262 kHz, allowing you toselect the sample rate and capture length that's right for your data. Oncecaptured, any portion of the signal can be played back in any FFT oroctave measurement. The convenient "AutoPan" feature lets you display themeasurement results synchronously with the corresponding portion of thecapture buffer to easily identify important features. Optional memoryexpansion modules lets you expand the SR780's capture depth to up to 8Msamples - that's almost 30 seconds of capture at the maximum samplingrate.Waterfall
All octave and FFT measurements can be stored in the SR780's two 2k deepwaterfall buffers. Waterfall storage is selectable as every n time recordsfor FFT measurements, or you can select a storage interval in seconds(down to 4 ms) for octave measurements. While displaying waterfalls, youcan adjust the skew angle to reveal important features, or change thebaseline threshold to eliminate low-level clutter. Any z-axis slice orx-axis record can be saved to disk or displayed separately for individualanalysis.Analysis
The SR780 includes a wide variety of built-in analysis features. Markeranalysis lets you use the marker to easily measure the power contained inthe harmonics, sidebands or within a given band of a frequency domainmeasurement. Important signal information such as THD, THD+N, sidebandpower relative to carrier, and total integrated power are calculated inrealtime and displayed on the screen. Marker statistics quickly calculatethe maximum, minimum, mean, and standard deviation of data at any point inthe display.
Use data tables to display up to 100 selected data points in a tablularformat. Limit tables allow you to define up to 100 upper and lower limitsegments in each display for GO/NO GO testing. Data and limit tabledefinitions can also be saved and recalled from disk for quick setup.
For sound level measurements, centile exceedance statistics areautomatically calculated for each 1/1,1/3, or 1/12 octave band as well forLeq.
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