PC based fft

[xcicc]

Hi, anybody have used or bought or know this instrument?
Is useful?


O037 New INSTRUSTAR ISDS205A 2CH 20MHz 48MSa/s FFT Analyzer Data LoggerPC Based USB Oscilloscope SHIPPING
O037 New INSTRUSTAR ISDS205A 2CH 20MHz 48MSa/s FFT Analyzer Data LoggerPC Based USB Oscilloscope SHIPPING-in Oscilloscopes from Industry & Business on Aliexpress.com | Alibaba Group

Thanks

 

[mickeymoose]

This scope looks very much like the Hantek 6022BE I bought from banggood. Good tool for the money, but do not expect to much. Limited use in audio as the resolution is only 8 bits. E

 

[xcicc]

This scope looks very much like the Hantek 6022BE I bought from banggood. Good tool for the money, but do not expect to much. Limited use in audio as the resolution is only 8 bits. E

Thanks for your answer.
So, isn't easy to reach the THD 0.001% resolution with this instrument? Right?

 

[mickeymoose]

To read 0.001% you need at least 14 bit precession (15 bits if you add dithering and other stuff only ELVEE knows about).
Why not use the sound card in your computer (likely a 16 bit) with the Visual Analyzer (Visual Analyser) created by your countryman Alfredo Accattatis. E

 

[xcicc]

To read 0.001% you need at least 14 bit precession (15 bits if you add dithering and other stuff only ELVEE knows about).
Why not use the sound card in your computer (likely a 16 bit) with the Visual Analyzer (Visual Analyser) created by your countryman Alfredo Accattatis. E

Thanks for your answer!

 

[arnyk]

Thanks for your answer.
So, isn't easy to reach the THD 0.001% resolution with this instrument? Right?

Mission impossible.

If memory serves 8 bits runs out around o.03 %

 

[SY]

It depends. If you notch out the fundamental, that 8 bits can get you a lot lower.

 

[arnyk]

It depends. If you notch out the fundamental, that 8 bits can get you a lot lower.

But then it ain't just 8 bits.

If you add a notch filter things like frequency response and bandpass go out the window.

I would say from decades of experience that the complexity of notch filters just isn't there you until well past 0.001%

 

[SY]

If you add a notch filter things like frequency response and bandpass go out the window.

Amazingly, they can be turned on and off depending on what measurement you're doing. These modern times!

 

[arnyk]

But then it ain't just 8 bits.

A potentially useful way the address the resolution issue might be here:

http://http://www.virtins.com/

Not a lot of useful stuff seems to be said here, Too many seem to not have not weaned themselves old fashioned analog scopes,

 

[samsagaz]

A potentially useful way the address the resolution issue might be here:

http://http://www.virtins.com/

Not a lot of useful stuff seems to be said here, Too many seem to not have not weaned themselves old fashioned analog scopes,

you tested virtins? works OK?

specs of VT DSO-2A10 looks OK!

I was looking to purchase a DS1054Z but dont know after found virtins :/

 

[SY]

I did a review of Virtins Multi-Instrument for AudioXpress. It is a terrific piece of software. Amazingly versatile, but be warned that the learning curve is steep.

 

[samsagaz]

I did a review of Virtins Multi-Instrument for AudioXpress. It is a terrific piece of software. Amazingly versatile, but be warned that the learning curve is steep.

Damn will purchase it then!

Will be ok with ONLY this DSO? or will need to start saving to purchase an table one like DS1054Z?

 

[SY]

I use it with an M-Audio Delta 192 card and a home-made interface/signal conditioner. This lets me measure noise and distortion at better than -120dBV and frequencies up to about 90kHz.

 

[samsagaz]

I use it with an M-Audio Delta 192 card and a home-made interface/signal conditioner. This lets me measure noise and distortion at better than -120dBV and frequencies up to about 90kHz.

incredible. I have an Onkyo SE200PCI, i thnk that its an good card, will see if works well.

 

[CharlieLaub]

Before spending money on software, check out Visual Analyser (I think someone already mentioned this software). It's pretty good, mostly. I used it to do some THD measurements in a kind of spectrum analyzer/scope mode and I found it to be quite useful that way. I was also able to create a custom multi-tone stimulus signal so that I could measure loudspeaker IM distortion.

Example measurement:

 

[samsagaz]

Before spending money on software, check out Visual Analyser (I think someone already mentioned this software). It's pretty good, mostly. I used it to do some THD measurements in a kind of spectrum analyzer/scope mode and I found it to be quite useful that way. I was also able to create a custom multi-tone stimulus signal so that I could measure loudspeaker IM distortion.

Example measurement:

Thanks for the tip! but this soft is compatible with some special hardware?

 

[CharlieLaub]

Thanks for the tip! but this soft is compatible with some special hardware?

It uses whatever soundcard you have on your system. I don't believe there are any special requirements.

 

[samsagaz]

I use it with an M-Audio Delta 192 card and a home-made interface/signal conditioner. This lets me measure noise and distortion at better than -120dBV and frequencies up to about 90kHz.

You know from where can i get an home-made interface/signal conditioner info? i need to purchase/build one when receive the virtins

 

[samsagaz]

ppl say that 8bit is not good enough to see audio signals, what about 12bit DSO?