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sekhar 5th October 2010 12:54 PM

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Hi frnds
this is sekhar . I just wanted to share a piece of software that i came across last night . it is a free pc based oscilloscope , using the sound card line in or microphone input , we can view and measure different signals.

here r a few details:-

Detailed Features about:

1.Oscilloscope (dual channel, xy, time division, trigger);
2.Spectrum Analyzer with amplitude and phase display (linear, log, lines, bar, octaves band analysis 1/3, 1/6, 1/9, 1/12, 1/24);
3.Wave-form generator with "custom functions", triangular, square, sinus, white noise and pulse generation (NO ALIASING);
4.Frequency meter (in time and frequency domain) and counter; in time domain by means of a real time zero crossing algorithm;
5.Volt meter with DC, true RMS, peak to peak and mean display;
6.Filtering (low pass, hi pass, band pass, band reject, notch, "diode", DC removal);
7.Memo windows (data log) for analysis and storage of time series, spectrum and phase with "triggering" events; possibility to save in various formats and display them with a viewer;
8.A TRUE software digital analog conversion (for complete signal reconstruction using Nyquist theorem) ;
9.Frequency compensation: one can create/edit a custom frequency response and add it to the spectrum analyzer spectrum ; added standard weighting curves A,B,C in parallel with custom frequency response;
10.Support for 8/16/24 bit soundcard by means of API calls;
11.Unlimited frequency sampling (depend from the capabilities of your soundcard);
12.Cepstrum analysis;
13.Cross Correlation;
14.Extended THD measurements, with automatic sweep and compensation.
15.ZRLC-meter with Vector scope, automatic sweep in time and frequency for automatic measurement.

I have used conventional analog scope in my college , but as my college is over i dont have any instrument to work with and i dont even have money to buy instruments . So i opted for a free pc based scope .may be u people have used such software in the past, please check this software and tell me whether is it any good . I cant do it because i cant cross reference my data with readings from a original scope.

here is the download link.just copy past it on it the browser and it will start downloading..

as i am not very well versed with this type of software kindly tell me is it good enough ..


Elvee 6th October 2010 07:41 AM

The subject has already been discussed here:

east electronics 7th October 2010 10:20 AM

all this is just fine ... but keep in mind that often in pc based osciloscopes and or other devices ground is a major problem

often ground of sound card is common with line ground and this may cause a number of complications ...

mt490 7th October 2010 01:15 PM

Yeah if we want to talk about "add ons" really it should be based on a differential input design.

cbdb 8th October 2010 11:46 PM

Get a sound card with a ballanced input.

east electronics 9th October 2010 09:19 AM


Originally Posted by cbdb (
Get a sound card with a ballanced input.

i dont really think that this is enough to provide full safety at all times ...something like isolated input via trafo can do this ... but then your all readings are based on the quality/ specs/bandwidth of your trafo

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