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Deriving Fractional Octave Spectra from the FFT with APx  
Type:  news Date:  Apr 14, 2016
… RMS level of a signal from the FFT by integrating the power spectral density. This equation is shown as (2), below. (2) where L = RMS level pi = power spectral density of FFT bin i n = the total…
Signal Generator Regulation in APx500 Audio Analyzers – Part 2: Regula  
Type:  page Date:  Sep 24, 2025
Measurements specifically aimed at regulation in Sequence Mode and Bench Mode as part of the Signal Generator Regulation on APx500 2 part post
Making External Sweeps with Noisy Signals on the 2700 Series and ATS-2  
Type:  news Date:  Apr 14, 2016
… 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…
Measuring Equivalent Continuous Sound Level with APx Audio Analyzers  
Type:  page Date:  Sep 24, 2025
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?
Continuous Sweep vs. Stepped Frequency Sweep for Converter Measurements  
Type:  news Date:  Apr 14, 2016
… 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…
How to Plot Multiple Measurement Data Sets on One Graph  
Type:  page Date:  Sep 24, 2025
Learn how to conduct measurements on a batch of devices and display results on one graph for comparison.
Measuring Loudspeaker Impedance Using APx Derived Measurement Results  
Type:  news Date:  Apr 14, 2016
… 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…
Why Are Chirps Always Swept from Low to High?  
Type:  page Date:  Sep 24, 2025
If you look at any APx measurement using a log-swept sine stimulus (a chirp), you might notice that the signal is always swept from low to high frequency. Learn more about why chirps are always swept
Retrieving a DUT serial number with APx  
Type:  news Date:  Apr 14, 2016
… 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. …
Headphone Testing Tips  
Type:  page Date:  Sep 24, 2025
As in loudspeaker testing, the measurement of headphones and earbuds involves driving an acoustic transducer, acquiring the result with a microphone and analyzing the signal. Learn three important
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