The SR770 is a single-channel 100 kHz FFT spectrum analyzers with a dynamic range of 90 dB and a
SR770 FFT Analyzer
The SR770 is a single-channel 100 kHz FFT spectrum analyzer with a dynamic range of 90 dB and a
High Dynamic Range
The SR770 has a dynamic range of 90 B. This means that for a full-scale input signal, the instruments have no spurious responses larger than
The SR770 uses a pair of high-speed,
Easy To Use
The SR770 is easy to use. The simple, menu-oriented interface logically groups related instrument functions.
The spectrum, power spectral density, and input time record can be displayed in a variety of convenient linear and logarithmic units including Vp, Vrms, dBVp, dBVrms or user-defined engineering units (EUs). The magnitude, phase and real and imaginary parts of complex signals can all be displayed. Several window functions including Hanning,
The SR770 also computes both the 15 and 30 band 1/3 octave spectra, commonly used in acoustics and noise measurement applications.
Triggering and Averaging
Flexible triggering and averaging modes let you see signals as low as 114 dB below full scale. RMS averaging provides an excellent estimate of the true signal and noise levels in the input signal, while vector averaging can be used with a triggered input signal to actually reduce the measured noise level. Both rms and vector averaging can be performed exponentially, where the analyzer computes a running average (weighting new data more heavily than older data), or linearly, where the analyzer computes an equally weighted average of a specified number of records. Triggering can be used to capture transient events or to preserve spectral phase information. Both internal and external triggering are available with adjustable pre-trigger and
The SR770 includes a low-distortion
With its low-distortion DDS source, the SR770 is capable of performing accurate frequency response measurements. The source is synchronized with the instrument's input allowing transfer functions to be measured with 0.05 dB precision. The SR770 measures the magnitude and phase response of control systems, amplifiers, and electromechanical systems, and displays the resulting Bode plot.
Limit and Data Tables
Sometimes it is important to keep track of a few key portions of a spectrum. Data tables allow up to 200 selected frequencies to be displayed in tabular format. Automated entry makes it easy to set up data tables for harmonic or sideband analysis. Convenient limit tables allow the entry of up to 100 separate upper or lower limit segments for
Three built-in analysis modes simplify common measurements. Harmonic analysis computes both harmonic power and THD (Total Harmonic Distortion) relative to a specified fundamental. Sideband analysis lets you compute power in a set of sidebands relative to the carrier power. And band analysis lets you easily integrate the power in a selected frequency band. All three analysis modes provide clear, on-screen markers which make it easy to pick out frequencies of special interest, such as harmonics or sidebands.
The SR770 has a marker that is designed to be fast, responsive and flexible. The marker can be configured to read the maximum, minimum or mean of a selected width of display, or can be set to tracking mode to lock on to a moving peak.
Data taken with the SR770 can be processed with the built-in trace calculator. Basic arithmetic functions such as addition, subtraction, multiplication, division, square roots and logarithms can be performed on traces. Traces can be combined with other on-screen traces, or with traces stored on disks. These calculator functions are quite useful for performing background subtraction or normalization of data.
Flexible Storage and Output
All traces, data tables and limit tables can be stored using the USB drive. Data can be saved in a space-saving binary format, or an easy-to-access ASCII format for off-line analysis. A variety of hardcopy options let you easily print data from the instruments. The screen can be dumped to a
Easy to Interface
All functions of the analyzers can be queried and set via the standard