IEC 62754:2017 pdf download

IEC 62754:2017 pdf download.Computation of waveform parameter uncertainties
1 Scope
This document specifies methods for the computation of the temporal and amplitude parameters and their associated uncertainty for step-like and impulse-like waveforms. This document is applicable to any and all industries that generate, transmit, detect, receive, measure, and/or analyse these types of pulses.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60469:201 3, Transitions, pulses and related waveforms – Terms, definitions and algorithms
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • IEC Electropedia: available at http://www.electropedia.org/ • ISO Online browsing platform: available at http://www.iso.org/obp 3.1 aberration region 3.1.1 post-transition aberration region interval between a user-specified instant and a fixed instant, where the fixed instant is the first sampling instant succeeding the 50 % reference level instant for which the corresponding waveform value is within the state boundaries of the state succeeding the 50 % reference level instant [SOURCE: IEC 60469:201 3, 3.2.1 .1 , modified – the note 1 to entry has been deleted.] 3.1 .2 pre-transition aberration region interval between a user-specified instant and a fixed instant, where the fixed instant is the first sampling instant preceding the 50 % reference level instant for which the corresponding waveform value is within the state boundaries of the state preceding the 50 % reference level instant [SOURCE: IEC 60469:201 3, 3.2.1 .2, modified – the note 1 to entry has been deleted.] 3.2 amplitude 3.2.1 impulse amplitude difference between the specified level corresponding to the maximum peak (minimum peak) of the positive (negative) impulse-like waveform and the level of the state preceding the first transition of that impulse-like waveform [SOURCE: IEC 60469:201 3, 3.2.3.1 ] 3.2.2 waveform amplitude difference between the levels of two different states of a waveform[SOURCE: IEC 60469:201 3, 3.2.3.2, modified – the Note 1 to entry has been deleted and the reference to Figure 1 has been added.] 3.3 correction operation that combines the results of the conversion operation with the transfer function information to yield a waveform that is a more accurate representation of the signal Note 1 to entry Correction may be effected by a manual process by an operator, a computational process, or a compensating device or apparatus. Correction shall be performed to an accuracy that is consistent with the overall accuracy desired in the waveform measurement process. [SOURCE: IEC 60469:201 3, 3.2.4]3.4 coverage factor numerical factor used as a multiplier of the combined standard uncertainty in order to obtain an expanded uncertainty Note 1 to entry: A coverage factor, k, is typically in the range 2 to 3. Note 2 to entry: Coverage factor is also defined as a “number larger than or equal to one by which a combined standard measurement uncertainty is multiplied to obtain an expanded measurement uncertainty,” (See ISO/IEC Guide 99:2007, 2.38). [SOURCE: ISO/IEC Guide 98-3:2008, 2.3.6, modified – the Note 2 to entry has been added.] 3.5 degrees of freedom in general, the number of terms in a sum minus the number of constraints on the terms of the sum [SOURCE: ISO/IEC Guide 98-3:2008, C.2.31 ]3.7 instant particular time value within a waveform epoch that, unless otherwise specified, is referenced relative to the initial instant of that waveform epoch [SOURCE: IEC 60469:201 3, 3.2.1 3] 3.7.1 initial instant first sample instant in the waveform [SOURCE: IEC 60469:201 3, 3.2.1 3.3] 3.7.2 impulse center instant instant at which a user-specified approximation to the maximum peak (minimum peak) of the positive (negative) impulse-like waveform occurs [SOURCE: IEC 60496:201 3, 3.2.1 3.2] 3.7.3 reference level instant instant at which the waveform intersects a specified reference level SEE Figure 1 . [SOURCE: IEC 60469:201 3, 3.2.1 3.5, modified – the reference to Figure 1 has been added.]