With an OROS 3-Series you get a multi-channel analyzer, so, why not turn your unit into a true multi-channel sound level meter. The OVA plug-in extends the analyzer capabilities to a comprehensive acoustic measurement system. The OVA complies with the latest standards such as IEC 60-672. It runs 3 RMS and a peak detector on each input. The detectors feature time filtering and weighting. The user selectable 3rd order 10 Hz high pass input filter removes unwanted low freq components. Overall levels can be tracked during days with the deep profiles memory.