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The FFT window size can be selected from 16 different options, from 128 to 4,194,304 points, while there is a choice of no less than 55 different windowing functions including rectangular, triangular, Hanning, Hamming, Blackman, Gaussian, cosine, Poisson and so on.
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There are also various add-on functions, like a Waterfall Plot/Spectrogram, Data Logger, LCR Meter and a Vibrometer, plus an option which allows you to create, save and execute a series of Device Test Plans.Īfter downloading and trying out the evaluation version of Virtins Multi-Instrument 3.2 (VMI 3.2) for a week or two, we were motivated to develop the USB Virtual Instrument Interface featured elsewhere in this issue. There are three performance levels which may be purchased: “Lite” costing US$49.95, “Standard” costing US$99.95 and “Pro” costing US$199.95. In this case it’s a fully-featured version which “expires” after 21 days unless you buy a licence from them online. Like TrueRTA, an evaluation version of VMI 3.2 can be downloaded free from their website.
It supports all Windows-compatible sound cards and interfaces and Virtins’ own virtual instruments – plus many industrial ADC/DAC cards like the DAQmx series from National Instruments.
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VMI 3.2 is the latest version of a software package first released in late 2004, for use with PC sound cards. Virtins has specialised in PC-based virtual instrument technology since it was founded in the early 1990s and in addition to the Multi-Instrument software package, it currently markets a range of virtual DSOs together with its own real-time audio analyser.
Recently though, we became aware of another software package called Multi-Instrument 3.2, developed by a Singapore-based firm called Virtins Technology. While we found that TrueRTA has many worthwhile features, including the ability to make accurate frequency response and noise level plots, it did have a few limitations with regard to things like distortion and crosstalk measurements and plots.
#Truerta impulse delay test how to
Back in the October 2011 issue of SILICON CHIP, we explained how to test common domestic audio gear using a good-quality sound card with your PC and running a virtual audio test instrument package like TrueAudio’s TrueRTA.