SR760 and SR770 - Spectrum Analyzer FFT The SR760 and SR770 are single channel, 100 kHz FFT Spectrum Analyzers with a dynamic range of 90 dB and a real-time bandwidth of 100 kHz. The SR770 additionally includes a low distortion synthesized source allowing you to measure the transfer functions of electronic and mechanical systems. The speed and dynamic range of these instruments, coupled with their flexibility and many analysis modes, make them the ideal choice for a variety of applications including acoustics, vibration, noise measurement, and general electronic use.