FFT Spectrum Analyzers SR780 — 100 kHz two-channel dynamic signal analyzer SR780 Dynamic Signal Analyzer · DC to 102.4 kHz bandwidth · 90 dB dynamic range · Low-distortion synthesized source · 145 dB dynamic range in swept-sine mode · Real-time octave analysis · Up to 32 Mbyte memory · GPIB and RS-232 interfaces The SR780 Dynamic Signal Analyzer combines high performance and low cost in a full-featured package. It offers 102.4 kHz FFTs with 90 dB dynamic range, sweptsine measurements, ANSI standard octave analysis, waterfall displays, and transient capture for less than half the cost of other similarly equipped analyzers. Spectrum Analysis The SR780 delivers true two-channel, 102.4 kHz FFT performance. Its fast 32-bit floating-point DSP processor gives the SR780 a 102.4 kHz real-time rate with both channels selected. Two precision 16-bit ADCs provide a 90 dB dynamic range in FFT mode. Selectable 100 to 800 line analysis optimizes time and frequency resolution, and you can zoom in on any 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 independently. You can choose separate frequency spans, starting frequencies, number of FFT lines, or averaging modes for each display. So it’s easy to look at a wideband display and zoom in on a specific feature simultaneously. The SR780 lets you select from two sampling rates: 256 kHz or 262 kHz, so frequency spans come out in either a binary (102.4 kHz, 51.2 kHz, ...) or decimal (100 kHz, 50 kHz, 25 kHz, ...) sequence depending on your requirements. · SR780 ... $9950 (U.S. list) Stanford Research Systems phone: (408)744-9040 www.thinkSRS.com

SR780 Dynamic Signal Analyzer Octave analysis is fully compliant with ANSI and IEC standards. Full octave, 1/3 octave and 1/12 octave analysis are all available. Switchable analog A-weighting filters, as well as built-in user math weighting functions (A, B and C), are included. Octave averaging choices include exponential time averaging, linear time averaging, peak hold, and equal confidence averaging. IEC compliant peak hold, impulse, fast and slow sound level measurements are all calculated. Swept-Sine Analysis Swept-sine analysis is used for measurements involving high dynamic range or wide...

SR780 Dynamic Signal Analyzer stored files, constants, or a rich array of supplied operations including the arithmetic functions, FFT, inverse FFT, jω, d/dω, exp, ln x and many others. Unlike many analyzers, the SR780’s measurement rate isn’t reduced when user math is selected. For instance, the function exp(ln(conj(Avg(FFT2/ FFT1))) can be calculated with a 50 kHz real-time bandwidth. Source Six source types are available: low distortion (–80 dBc) single or two-tone sine waves, chirp, white noise, pink noise and arbitrary waveforms. The chirp and noise sources can both be bursted to provide...

SR780 Features FFT Measurement Group FFT, Time Record, Windowed Time, Time Capture, Transfer Function, Cross Spectrum, Coherence, Cross-Correlation, Auto-Correlation, Orbit, User Math Windows Hanning, Blackman-Harris, Flat-Top, Kaiser, Force/ Exponential, User-Defined, ±T/2, ±T/4, T/2, Uniform Octave Analysis Measurement Group 1/1, 1/3, 1/12 Octave, Time Capture, User Math, Leq, Impulse, Total Power User Math +, –, ×, ÷, Conjugate, Magnitude/Phase, Real/Imaginary, Sqrt, FFT, Inverse FFT, jω, Log, Exp, d/dx, Group Delay, A-Weighting, B-Weighting, C-Weighting, x/x–1 Swept-Sine Measurement Group...

Specifications apply after 30 minutes warm-up and within two hours of last auto-offset. Measured with 400-line resolution and anti-alias filters enabled unless stated otherwise. Measurement Groups FFT, Octave Analysis, Swept-Sine Real-time bandwidth Dynamic Range Dynamic range Harmonic distortion Intermodulation dist. Alias responses Amplitude Accuracy Single channel Cross channel Phase Accuracy Single channel displays have the same range) displays can have different spans 102.4kHz (highest FFT span with continuous data acquisition Includes spurs, harmonic and intermodulation distortion and alias...

Transient Capture Maximum rate Octave Analysis Frequency range Measurement record starts up to 8192 samples prior to the trigger. Continuous data recording 262,144 samples/s for both inputs 2 Msamples (single input) 8 Msamples with optional memory Single channel: <0.2B (1 second stable average, single tone at band center) 80 dB (1/3 octave, 2 second stable Impulse, Peak, Fast, Slow and Leq <5 D, ilOOmA peak output current Dynamic range Sound level Source Output Amplitude range Amplitude resolution Offset adjust Output impedance Sine Source Amplitude accuracy ±1 % of setting, 0Hz to 102.4kHz,...