2238E Bruel & Kjaer Analyzer
The hardware comes with two independent frequency weighted detectors. These can be used for RMS/Peak measurements or as two RMS detectors in parallel. All time weighted parameters, using Fast, Slow and Impulse time constants, can be computed in parallel and stored in the internal memory. Effects of sound incidence [frontal or random] can be corrected by a built-in filter, as can the effects of the windscreen, thus giving you Class 1 precision in all situations.