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HomeProductsQA100QA101QA212QA300QA400QA400SpecsQA401QA500QA190SupportForumDeveloperApp NotesDownloadsAboutSiteWebSearchRegisterLoginYou are here:HomeQuantAsylum ProductsGo to product page…What's New: Recent Blog PostsBlog Part:Title:Pane:Insert:Add ModuleUsing Notch Filters to Improve THD Measurementsby admin on Sunday, December 20, 2015 3:39 PMThe use of notch filters is a well-known technique for improving the THD measurement performance of audio and RF equipment. THD measurements are a challenge because you usually have a massive fundamental that you aren’t interested in, and several very small harmonics that you are interested in. But with a notch filter, you knock the fundamental down before it has a chance to interact with the non-linearity of the measuring equipment input stages. First, consider a discrete, low-distortion 1 KHz generator. There are many designs out there to chose from, and most are based on Wien-bridge topologies. Below we can see the output of the oscillator at 0 dBV going straight into the QA401. The THD is about –99 dB. More importantly, however, note that the 2nd harmonic is at 102 dB below the fundamental. ...File Under:QuantAsylum BlogComments (0)QA405 and QA401 Statusby admin on Sunday, November 01, 2015 9:45 PMNote: Details below will be updated as required. All figures below are tentative until large batches of devices can be measured. Last February 2015 we wrote about the QA405, which was to be the first successor to the QA400. It is bigger/strong/faster than the QA400 in every way. We noted at the time that the product was complex and expensive. Those are both still true. However, we also asked for feedback from users, and feedback we got! Of course, there were some that wanted $10,000 tester performance for $200. But most understood that the next 5 or 10 dB of performance comes at increasing cost. People appreciated the convenience and repeatability of the QA400, but really wanted differential IO and isolation. Over and over those two items kept coming up. In the post we noted we’d ship by the end of 2015. So, where are things today? We’re pleased to report we’ve made steady progress, albeit at somewhat of reduced scope. The evolved...File Under:QuantAsylum BlogComments (0)Visualizers and Examining the Residualby admin on Sunday, June 28, 2015 10:01 AMThis post takes a look at a framework to enable you to write software that can perform custom analysis on captured waveforms, and display the results of that analysis, all within the application. This first release will focus on the QA400, and then we’ll add this same mechanism into an upcoming QA101/QA100 software release. This will enable you to download visualizers from others to help with your data analysis needs. What could these do? These could be things to help analyze speaker parameters, room parameters, etc. But more importantly, the visualizers can display this information in a way that makes sense for the task at hand. Think of visual
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