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Generating Low Frequency Triangle Waves with SYS-2722  
… kHz. Once the .wav file is created, you can import it into the DigitalGenerator of the SYS-2722 as shown in the figures below. Figure 1  Importing an arbitrary waveform into the digital generator. …  
Making External Sweeps with Noisy Signals on the 2700 Series and ATS-2  
… is conducted. The sweep panel configurations we are using for theSYS-2722 and ATS-2 are shown in Figures 1 and 2 respectively. Figure 2 ATS-2 Sweep panel configuration. The sweep starts by…  
Equalized Sweeps for APx500  
… and de-emphasis on playback, established by the Recording Industry Association of America. Figure 1 shows the RIAA equalization curve for playback of vinyl records. To test a phonograph preamplifier, you would…  
Retrieving FFT Data in AP2700 and ATS-2 Control Software  
… all FFT bins are returned for an 8k FFTlength at SR = 65536 Hz, the Sweep Panel should be set up as shown in Figure1b. With the sweep panel properly configured, once the sweep is completed, theFFT spectrum…  
Optical Digital Output Signal Quality Check  
… observe, for example, a walking zeros pattern, set the Digital Generator and Digital I/O panels as shown below. With an output sample rate of 48 kHz and the Samples/Step control set to 48 k, the zeros will…  
Running an External Program from APx500  
… that can be invoked by the command line, the process can easily be automated. In the example shown in Figure 2, we are using a third party program called Goldwave to play a .wav file containing an audio…  
Measuring Internal Sample Rate Error with AP2700  
… and adjacent bins, to determine its precise frequency. When finished, an FFT response graph will be shown, and the prompt will reappear with the frequency error displayed. Since the nominal sample rate of the…  
Measuring Amplifier Damping Factor with APx500  
…e graph (Figure 4). It displays results for each of the analog input channels enabled in the APx software. As shown, it also retrieves the channel labels from the system (in this case, “Left” and “Right”). Figure…  
Using APx with VEE and MATLAB (API Wrapper)  
… builders. Adding a .NET operation to the VEE program. A simple sample program written in VEE is shown below. It does the following: Opens APx500 with the application window visible. Turns off the…  
Configuring VB.NET and C# Applications After Upgrading APx500  
… Visual Basic.NET In VB.NET, the references are accessed by selecting Project > Properties, as shown in Figure 1 (Note: The images shown below are from Microsoft Visual Basic 2008 Express Edition. The…  
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