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In Reply to: RE: Another video on Spectral Analysis for audio posted by Michael Samra on May 22, 2016 at 00:01:29
I am looking into PC test analysis. Check out the the link below for the Virtins DSO. With a PC and the included software, this device functions as an oscilloscope, spectrum analyzer, multimeter, data logger, signal generator. No sound card required.
Anyone have comments or experience with these units?
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It's my opinion a dedicated analog scope will serve you better as a primary instrument. The VT's 100V input rating is somewhat lacking for tube work. Also, the full-scale sensitivity of 20mV (+/- 10mV) might make some measurements difficult. My 30-year-old scope is capable of 500uV/division (4mv full scale) with a 1:1 probe. I would often need an external, low-noise amplifier to see hum and noise if not for that.
I think the VT might be useful for PC-based spectrum analysis and distortion measurements. These functions could overcome some of the limitations of the scope, although I would want to know if the 62dB dynamic range applies to spectrum analysis over the range of 10Hz - 100kHz. The -45dB crosstalk spec will certainly limit certain types of amplifier analysis, such as measuring the crosstalk of stereo preamps and amplifiers. In comparison, the relatively inexpensive soundcard I use claims 113dB input dynamic range and -130dB crosstalk at 1kHz.
All this aside, if you can only have one piece of test equipment, and particularly if you dislike buying used gear, the VT can do a lot of work for the money.
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Buy Chinese. Bury freedom.
Thanks. I do have a 40 year old Tek scope. I was planning on using the VT for spectrum analysis, THD, IMD measurements. Supposedly it will also function as an LCR meter. Does a lot for the money and I have a spare PC available.
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