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As a Designated Institute by the National Institute of Metrology, Quality and Technology (Inmetro), the DSHO is in charge of the standardization of the Brazilian National Time and Frequency (TF) Reference and also affords the activities of accreditation of laboratories by the Inmetro.
So, the DSHO keeps the time and frequency standards assuring the brazilian metrological time and frequency traceability and establishes a permanent international comparison with the Bureau International des Poids et Mesures (BIPM).
The Legal Time (HLB) is also intercompared in real-time with others international time references by means of the Inter-American Metrology System (SIM) which is accessible by the internet link SIM Time Scale Comparisons via GPS Common-View.