The SR760 and SR770 are single-channel 100 kHz FFT spectrum analyzers offering a 90 dB dynamic range and a 100 kHz real-time bandwidth. Both instruments cover spectrum analysis across the low-frequency and audio band, while the SR770 additionally integrates a low-distortion synthesized source that allows measurement of the transfer functions of electronic and mechanical systems. The combination of speed, dynamic range, and multiple analysis modes makes the pair suitable for a variety of measurement tasks.

Listed applications for these analyzers include acoustics, vibration, noise measurement, and general electronic use. The 15- and 30-band 1/3-octave spectra, with available A-weighting compensation, target acoustics and noise measurement work, computing amplitudes from band −2 (630 mHz) through band 49 (80 kHz). With its low-distortion DDS source, the SR770 performs frequency response measurements on control systems, amplifiers, and electro-mechanical systems, displaying the resulting Bode plot.

ValueTronics stocks and holds its own inventory in a 20,000-square-foot secure warehouse at 1675 Cambridge Drive in Elgin, Illinois. Every pre-owned instrument is inspected and functionally verified in-house before it ships, while new units leave the warehouse factory-sealed exactly as received. That combination of on-hand stock and used-unit verification lets buyers source the right analyzer with confidence in its condition.

Compare Other Models in This Series

The SR760 and SR770 form a two-model line of single-channel 100 kHz FFT spectrum analyzers that share the same core architecture: a 90 dB dynamic range, a 100 kHz real-time bandwidth, dual 24-bit DSPs, and a 16-bit A/D converter sampling at 256 kHz. Both models provide spectrum, power spectral density, time record, and 1/3-octave measurements along with harmonic, sideband, and band analysis.

The defining difference within the family is the synthesized source: the SR770 integrates a low-distortion DDS source for frequency response and transfer function measurements, while the SR760 covers the same spectrum and octave analysis without an internal source.

Each pre-owned model below is its own dedicated product page with condition-matched pricing. Choose the SR760 or SR770 listing that matches your configuration to view the specifications and availability for that pre-owned unit.

The SR770 is distinguished within the line by its built-in low-distortion synthesized source, which adds two-tone IMD test signals, pink and white noise, and chirp output, and enables transfer function measurements to 0.05 dB precision that the source-less SR760 does not provide.

The principal difference shown in the comparison table is the source: the SR770 includes the synthesized DDS source for frequency response work, and the SR760 does not. This distinction is also reflected in the list pricing of the two configurations.

A secondary difference is disk capacity — the 3.5" drive stores 1.44 Mbyte on the SR770 and 720 kbyte on the SR760. Aside from the source and disk capacity, the two models share the same frequency range, dynamic range, real-time bandwidth, input characteristics, analysis modes, and interface set, as the table that follows details.

Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below.

Product Core & Specifications

About this Pre-Owned unit

This pre-owned unit is inspected and functionally verified in-house before it ships and is backed by our pre-owned warranty. To confirm its exact condition, firmware revision, installed options, or included accessories for your application before ordering, contact our Test Architects.

• Warranty included
• Functional verification included
• Standard Calibration Upgrade Options: No Calibration Required, NIST Traceable, Z540.1 or ISO 17025 with Data, Z540.3 Guardbanding with Data.
• Note that unnecessary accessories may not be included (contact Test Architect to confirm).

ValueTronics supplies both new and used test and measurement equipment. New units ship factory-sealed, exactly as received from the manufacturer; every used unit is inspected and functionally verified in-house at our 20,000 sq ft secure facility in Elgin, Illinois before it ships. Our Test Architects can help you select the condition, calibration, and configuration that fit your application.

Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.