PTB (Physikalisch-Technische Bundesanstalt) the German institute for metrology, is an undisputable reference worldwide in terms of accreditation. ACOEM is thus very proud to announce that PTB certified DUO as a class 1 sound level meter according to the IEC 61672-1 standard. Released on February 6, 2012, PTB certificate # 1-63-4052726 (21.21_12.01), thus authenticates the compliance of DUO with the reference international standard for sound level meters.
More specifically the intensive acoustic tests carried out at PTB confirmed that DUO fulfils class 1 according to standard IEC 61672 for both measurement configurations: reference direction 0° (with or without noise cone) and 90° (noise cone required).
This achievement is a result of studies performed during the development of DUO, with the collaboration of our partner G.R.A.S. Sound & Vibration. A specific attention was paid to the reference direction 90° (representing the instrument’s most frequent use as a permanent outdoor noise measurement unit) in order to comply with the tolerances allowed for the frequency response curves and, most important, for directivity assessment, as set in the standard.
The benefit for the user is of highest value: whatever the measurement conditions are (ground transportation noise, aircraft noise, noise around recreational activities or industrial areas …) DUO will always perform with the optimum operating configuration.
01dB - DUO - Smart Noise Monitor
01dB introduces the new version of the DUO Smart Noise Monitor. Totally modular, DUO provides its users with the most complete offering to upgrade from sound-level meter to monitoring station without changing equipment. Visually, DUO remains the same: a metallic profile allowing fast and secure anchoring, a rubber grip for better handling, a screen that is perfectly legible in direct sunlight, high quality finish. Similarly, it maintains its ...