Visual Analyser Project ( current v. 2022 Silvia (beta)  )

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Visual Analyser is a complete professional real time software, transform your PC in a full set of measurement instruments; no new hardware necessary (you can use the Sound Card of your PC) or you can use a specific external hardware (see Hardware section for an example). Visual Analyser runs on Windows 9x,ME,2k,XP,NT,Server,Vista,7,8/10. Visual Analyser 2022 Silvia Beta version now available (for 64 and 32 bit platform), no longer compatible with Windows 9x. The 2011-2012 version runs on Linux by means of wine utility. WAVE file management added in 2012 version and further improved in 2012, 2014, 2019, 2020, 2021 and 2022 version. VA has been adopted as basic measurements software by the magazine (latest: the magazione has closed its activity):


and the company:

Our software ( latest: 2022 with NEW 3D, and NEW spectrum (you can define the frequency of each spectral line) and more, with Uncertainty evaluation, WATERFALL, no-flickering  windows and more) see News

See also DEMOCRATIC HELP and download my latest Ph.D. thesis (only Italian, sorry)


The latest 2022,2021,2020,2019,2014,2012,2011 as well as the 2010 NE-XT v2.4 version include a powerful ZRLC-meter (improved in 2019) capable to measure the Impedance of a device at different frequencies (that is, Capacitance, Inductance, Resistance, Real and Imaginary part, Q-factor, phase). It needs of your acquisition board (your soundcard for instance)  plus a very simple circuit   (two low-cost operational amplifier). You can find an example in this web site. The ZRLC software allows also to measure the input impedance of amplifiers, transformers and loudspeakers. See ZRLC details. Along with the ZRLC meter window, a simple Vector Scope has been added. Click here for a full screenshot. The recent 2.4 version add some new interesting features, see News section. The Nuova Elettronica magazine published a new article about a specific hardware for ZRLC function.

Note to all VA's website visitors: the content of Italian website could be different from English one; it is not only a simple translation from English, because of different link to Italian articles and authors (not useful for an English reader). Plus other little details due to my better knowledge of Italian language!

Main characteristics of VA:

VA is a real time program which simulates a set of electronic instruments, such as:

  • Oscilloscope (dual channel, xy, time division, trigger);

  • Spectrum Analyzer with amplitude and phase display (linear, log, lines, bar, octaves band analysis 1/3, 1/6, 1/9, 1/12, 1/24);

  • Wave-form generator with "custom functions", triangular, square, sinusoidal (all with NO ALIASING and smooth transition), white/pink noise, pulse generation, DC generation[New!];

  • Frequency meter (in time and frequency domain) and counter; in time domain by means of a real time zero crossing algorithm;

  • Volt meter with DC[New!], true RMS, peak to peak and mean display plus resolution calculus; 

  • Filtering (low pass, hi pass, band pass, band reject, notch, "diode", DC removal);

  • Memo windows (data log) for analysis and storage of time series, spectrum and phase  with "triggering" events; THD and Impedance data logging with spline interpolation; possibility to save the graphics in various format (.tee, .txt, .wmf) )and display them with an internal viewer[New!];

  • Screenshot of Spectrum and Scope window;

  • A TRUE software digital analog conversion (for complete signal reconstruction using Nyquist theorem) ;

  • Frequency compensation: possibility to create/edit a custom frequency response and  add it to the spectrum analyzer computed spectrum; added standard weighting curves A,B,C [New!]in parallel with custom frequency response;

  • Support for 8/16/24 bit soundcard by means of API calls;

  • Internal 80 bit IEEE floating point variables for minimum rounding error;

  • Unlimited frequency sampling (depend from the capabilities of your soundcard/acquisition device);

  • Cepstrum analysis;

  • Cross Correlation;

  • Extended THD measurements, with automatic sweep, compensation, data log;

  • ZRLC-meter with Vector scope, automatic sweep in time and frequency for automatic measurement;[New!]

  • Calibration mechanism (you can calibrate the VA scales directly in VOLT or dB or percent full scale) ;

  • Set of values computed in real time (peak to peak, peak, crest factor, form factor, true rms, mean, frequency with zero-crossing algorithm).[New!]

  • Wave file recording and playback

  • Internal input

  • Custom FIR filters

See the Product details section for more details or here for a brief introduction

ROGA-Instruments adopted Visual Analyser as basic freeware software for its products (ex. ROGAdaq2)

Contact Information

Electronic mail
General Information: alfredo[at]


VA Overview
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Send an e-mail to  alfredo[at] for questions and/or suggestions about the web site. The webmaster is Alfredo Accattatis.
Last modified: 29-11-2022