… (root sum of squares) summation of the 9 harmonics relative to the fundamental. The THD number is shown below the spectrum graph when the macro finishes (Figure 2).
Figure 2. Spectrum from the Burst…
… players and their associated headphones, according to British Standard / European Norm 50332. Also shown is how to use the APx Portable Audio Player / Portable Headphone Test...
Benchmarks. They are vital to ensure the R&D team produce a compelling new product or service and are essential on the production line of a manufacturing facility.
… Sweep method. APx can acquire both response curves and plot the difference if desired. Figure 1 shows frequency response curves measured by the two measurement methods. The two curves are identical below…
Using APx500 software version 5.0.1, users can configure the analog generator to stay in a fixed output range. This is useful for testing acoustic devices and electronic devices with sensitive input
… and select Program. This displays the Run External Program Step window. The figure below shows the filled-in dialog, including the necessary command line arguments:-port=USB -remote=mydvd…
Fast Fourier Transform (FFT) analysis, which converts signals from the time domain to their frequency domain equivalent, is incredibly useful in audio test.
In this post, we describe the relationship between the Generator Level setting and the measured level for arbitrary waveforms, as well as a procedure to help choose an appropriate Generator Level
