… pure tone to appear radically different than what you would typically expect. For example, Figure 1 shows the FFT spectrum of a 1 kHz sine signal at a level of -1 dBFS transmitted from a current smart phone…
… and measurements of the device’s output THD+N.
An example test of a Digital-to-Analog converter is shown below with a nested sweep of jitter frequency and audio frequency versus measured THD+N, according to…
… the APx Polar Plot utility has been revised to accommodate use of a manually operated turntable. As shown in Figure 1, there is now a turntable type called “None (manual rotation)”.
Figure 1: Select and…
… .config file are not used, in some cases the LabVIEW driver VIs may not work. The Examples project shown in the figure above contains a configuration file named APx500 Examples Project.lvproj.config. You can…
… brought the two systems to parity, with the DSIO now surpassing the PSIA in several key areas, as shown in the document linked below. For example, the DSIO supports independent master clocks, allowing for…
… scan a barcode of the serial number at the beginning of the sequence. This way the serial number is shown in the report and also gets recorded in the CSV log file every time the sequence is run.
…
… into instability, limiting techniques are typically employed. In APx, an Overload indicator (shown in the Status Bar) is activated when the modulator exceeds the defined overload point. For the APx…
…
Fig 4 (larger version) Add an additional SetValue method for channel 2 and complete the VI as shown above. You can see additional examples by simply opening up any VI in the APx LabVIEW driver and…
… to accommodate the input signal level. In Audio Precision instruments, the ranging choices are shown in a dialog that allows you to select the maximum level you expect. For the APx585 and 586, six ranges…
… for quality control analysis. Below is a trendline chart made in Microsoft Excel using the data shown in Figure 2 above.
Fig 4Trendline chart from CSV file data.
