The Audio Analyzer R+S UPL performs virtually every type of analog measurement: frequency response measurements; externally controlled sweeps with reference traces; determination of 3rd order difference frequency distortion; or spectral display of demodulated wow and flutter signals. In contrast to many other audio analyzers, the RS UPL can perform real dual-channel measurements in the audiofrequency range, i.e. there is no need for switchover between two inputs and this type of measurement is not limited to a few special cases.
The generator is equally versatile: it supplies any conceivable signal whether sinewave, noise signals, or multi-sinewave signals comprising up to 7400 frequencies.
In addition, the R+S UPL features excellent technical data: analog sinewave generation with harmonics of typ. -120 dB; spectrum displays with a noise floor below -140 dB for analog and -160 dB for digital interfaces; and FFT with a maximum frequency resolution of 0.05 Hz.
The R+S UPL provides signal monitoring via loudspeaker, jitter measurements on digital audio signals, resynchronization of jittered digital audio signals by means of a jitter-free clock signal, and much more.
The R+S UPL performs all measurements using digital signal processing. Analog signals to be tested undergo elaborate preprocessing before they are digitized and measured by means of digital routines. For example, in THD measurements, the fundamental is attenuated by means of a notch filter and the residual signal amplified by 30 dB before it is digitized. In this way, the dynamic range can be extended beyond that offered by the internal 20-bit converter. This provides sufficient margin for measuring converters of the future, which will be more advanced than those with present-day technology (see graph on the right). This concept ensures performance and flexibility by far superior to instruments providing purely analog or digital measurements.
The R+S UPL66 model is specially tailored to the requirements of production. It comes without a display and keypad, thus holding down costs. Yet the unit can be operated manually by connecting a PC keyboard and a VGA monitor, enabling fast fault localization in the event of production problems.