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Audio Precision improves stability

Audio Precision improves stability
B Series APx555 ADC test

Audio Precision improves stability

The second-generation APx555 can generate low-distortion analogue sine burst signals from 5Hz to 100kHz

The B Series APx555 analyser from Audio Precision has been developed to improve sine generator frequency stability with an accuracy of 30ppm. The second-generation APx555 can now also generate low-distortion analogue sine burst signals from 5Hz to 100kHz and allows users to independently invert the signal polarity of balanced channel outputs. It has lower system residual distortion, with THD+N improvement above 50kHz (−2dB) and THD improvement above 5kHz (varying from −2dB to −5dB).

For engineers validating and testing complex, multichannel and analogue-to-digital converters (ADCs), the B Series APx555 also offers an ADC Test Mode option capable of generating balanced analogue audio signals mixed with a calibrated common mode DC offset voltage. This optional feature is useful for testing devices that operate on a single supply voltage and require inputs with a DC bias voltage, such as audio codecs and ADC chips in mobile products. The ADC Test Mode also includes programmable voltage limits to prevent overvoltage damage to the device being tested.

APx v5.0 transfer function measurement example
APx v5.0 transfer function measurement example

The B Series introduction applies to the entire line of APx audio analysers, with all systems incorporating a redesigned embedded processor module that enables playback of longer arbitrary waveforms and improved download speeds. B Series APx analysers require APx500 audio measurement software version 5.0 (or later) but are compatible with APx project files created from version 4.6 (or earlier) software.

In related news, APx audio measurement software version 5.0 is now available. With this release, the manufacturer has added the ability to measure the transfer function of electronic audio and electroacoustic devices using any broadband signal. Release 5.0 also enables electronic activation of software option licences, eliminating the iButton requirement for such options with earlier versions of APx audio measurement software.



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