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Perceptual Audio Test Options for APx500 Series Analyzers  
… display to help pinpoint specific problems such as clipped words or dropouts. Additional results show average delay, delay vs. time, and the reference and the acquired waveforms. The PESQ/POLQA Average…  
Measuring Power Amplifiers with Reactive Loads  
… 2 and 1 ohm loads. If in doubt, run the measurement without them first. Results: This tab will show the measurement data after running the Power Cube measurement. From this page, you may export the data…  
FFT Scaling for Noise  
… used. The spectrum of a signal containing discrete tones combined with band-limited noise is shown in Figures 1 and 2. In Figure 1, the spectrum was measured without an FFT window (window = None). Note…  
Measuring Slew Rate or Rise Time  
For an overview of slew rate, specifically related to power amplifiers, this post discusses the mechanism of slew, and the basic measurement.  
Testing RDS with APx  
… card would be connected directly to an FM modulator/RF generator instead of the waveform recorder shown in Figure 2. Figure 2. Block diagram illustrating the process to create an RDS encoded…  
Quick Tip 220 - Introduction to APx500 Flex  
… YouTube Channel Video Description: In this brief video, Eric Schultheis introduces APx500 Flex, showcasing how it enables budget-friendly audio testing for speakers, microphones, wired headphones, and…  
Analog Input Ranges in APx500 Audio Analyzers – What you Should Know  
Using version 5.0.1 of APx500 software (released April 2, 2019), users can configure the analog generator to stay in a fixed output range. This is especially useful for testing acoustic devices, and  
APx Polar Plot Utility Instructions  
… Name dialog. Next, the utility will prompt you to select and configure a turntable (Figure 4). As shown, a simulated turntable is available for demonstration purposes. Figure 4. Turntable configuration…  
Measuring Equivalent Continuous Sound Level with APx Audio Analyzers  
In this post, we answer a common question: How can I measure the equivalent continuous sound level Leq,T and the A-weighted equivalent continuous sound level LAeq,T with my APx500 audio analyzer?  
THD and THD+N – Similar, but not the same  
THD and THD+N. They are closely related, but there’s an important difference between them that is often overlooked.  
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