… impedance curve is level dependent.
Figure 1. Schematic of loudspeaker impedance test.
Figure 1 shows a basic schematic of the Constant Voltage method, while Figure 2 shows the actual connections. Two…
… recordings, the generator was set to generate a 1 kHz sine wave at -20.0 dBV (100 mVrms). Figure 1 shows the RMS Level results from analyzing these five .wav files with the Input Connector set to File (Analog…
… set to a sample rate of 48 kHz.
Fig 2. Sine D/A generator, FFT with Equiripple window.
Figure 2 shows an FFT measured with an Equiripple window, using the Sine D/A generator set to a frequency of 1…
… the Configuration in the Output Settings dialog of Signal Path Setup to one of the CMRR modes, as shown below.
Configuration in the Output Setting dialog.
If the instrument is not in the APx525 Family,…
… which is discussed in Technote 106: Measuring Power Supply Rejection Ratio (PSRR).
The graph below shows PSRR versus frequency for a class D amplifier used in mobile devices, with appended traces for…
… to the correct locations and versions.
Now double click on APxControl.py. The UI will open, as shown above. Click the first button to load APx500. Then, click the second to load the example project. Click…
… for quality control analysis. Below is a trendline chart made in Microsoft Excel using the data shown in Figure 2 above.
Fig 4 Trendline chart from CSV file data.
… and connect it.
Fig 4
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…
… 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…
… .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…
