General standard[ edit ] The general standard IEC - Medical electrical equipment - Part 1: General requirements for basic safety and essential performance - gives general requirements of the series of standards. This standard does not assure effectiveness of a medical device. Revisions[ edit ] In , the third edition of IEC was published. It was the result of a comprehensive review of the second edition dating from Some key changes are: the outline and the numbering scheme of the clauses and subclauses were changed, risk management was made much more relevant and the concept of essential performance was added.
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Preview Abstract IEC The purpose of this this part of IEC is to establish, in a general way, suitable procedures and tolerances for installation of generator. This document presents a typical assembly. There are many possible ways to assemble a unit.
It is understood that a publication of this type will be binding only if, and to the extent that, both contracting parties have agreed upon it. This document excludes matters of purely commercial interest, except those inextricably bound up with the conduct of installation. This document applies to vertical generators according to IEC The tolerances in this document have been established upon best practices and experience, although it is recognized that other standards specify different tolerances.
Brushless excitation system is not included in this document. Wherever this document specifies that documents, drawings or information is supplied by a manufacturer or by manufacturers , each individual manufacturer will furnish the appropriate information for their own supply only.
Sound Level Meter Standards
Mikree However, because the unit of sound was historically described in decibels, the exposure is most often described in terms of sound exposure level SELthe logarithmic conversion of sound exposure into decibels. A-Weighting, with less lower and higher frequenciesand a slight boost in the mid-range, represents what humans are capable of hearing. Modern monitoring stations can also offer remote communication capabilities using cellular modems, WiFi networks or direct LAN wires. To ensure accuracy in periodic testing, procedures should be carried out by a facility that can produce results traceable to International Laboratory Accreditation Cooperationor other local International Laboratory Accreditation Cooperation signatories. Instruments are available that measure 1 or all three types of measurement In addition to the type of meter, the standard also lists two performance categories Class 1 and Class 2. Some applications require the ability to monitor noise continuously on a permanent or semi-permanent basis. The A-frequency curve was based on the historical equal-loudness contours and while arguably A-frequency-weighting is no longer the ideal frequency weighting on purely scientific grounds, it is nonetheless the legally required standard for almost all such measurements and has the huge practical advantage that old data can be compared with new measurements.
BS EN 60651:1994, IEC 60651:1979
Preview Abstract IEC The purpose of this this part of IEC is to establish, in a general way, suitable procedures and tolerances for installation of generator. This document presents a typical assembly. There are many possible ways to assemble a unit. It is understood that a publication of this type will be binding only if, and to the extent that, both contracting parties have agreed upon it.