Already a subscriber? 
MADCAD.com Free Trial
Sign up for a 3 day free trial to explore the MADCAD.com interface, PLUS access the
2009 International Building Code to see how it all works.
If you like to setup a quick demo, let us know at support@madcad.com
or +1 800.798.9296 and we will be happy to schedule a webinar for you.
Security check
Please login to your personal account to use this feature.
Please login to your authorized staff account to use this feature.
Are you sure you want to empty the cart?
BS EN 62754:2017 Computation of waveform parameter uncertainties, 2017
- National foreword
- English [Go to Page]
- CONTENTS
- FOREWORD
- 1 Scope
- 2 Normative references
- 3 Terms and definitions [Go to Page]
- Figure 1 – Reference levels, reference level instants, waveform amplitude, and transition duration for a single positive-going transition
- Figures [Go to Page]
- Figure 2 – Overshoot, undershoot, state levels, and state boundaries for a single positive-going transition
- 4 Waveform measurement [Go to Page]
- 4.1 General
- 4.2 Waveform parameters
- 4.3 Waveform measurement process [Go to Page]
- 4.3.1 General
- Figure 3 – Creation of measured, corrected, and reconstructed waveforms and the final estimate of the input signal [Go to Page]
- 4.3.2 General description of the measurement system
- 5 Waveform and waveform parameter corrections [Go to Page]
- 5.1 General
- 5.2 Waveform parameter corrections
- 5.3 Waveform corrections and waveform reconstruction [Go to Page]
- 5.3.1 General
- 5.3.2 Sample-by-sample correction
- 5.3.3 Entire waveform correction
- 6 Uncertainties [Go to Page]
- 6.1 General
- 6.2 Propagation of uncertainties [Go to Page]
- 6.2.1 General
- 6.2.2 Uncorrelated input quantities
- 6.2.3 Correlated input quantities
- 6.3 Pooled data and its standard deviation
- 6.4 Expanded uncertainty and coverage factor [Go to Page]
- 6.4.1 General
- Tables [Go to Page]
- Table 1 – Value of the coverage factor kp that encompasses the fraction p of the t -distribution for different degrees of freedom (from ISO/IEC Guide 98-3) [Go to Page]
- 6.4.2 Effective degrees of freedom
- 6.5 Entire waveform uncertainties
- Figure 4 – Example of waveform bounds focusing on the trajectories that impact pulse parameter measurements
- 7 Waveform parameter uncertainties [Go to Page]
- 7.1 General
- 7.2 Amplitude parameters [Go to Page]
- 7.2.1 State levels
- Figure 5 – Relationship between selected waveform parameters
- Table 2 – Different methods for determining state levels, as given in IEC 60469,and their uncertainty type and method of computation [Go to Page]
- 7.2.2 State boundaries
- 7.2.3 Waveform amplitude (state levels)
- Table 3 – Different methods for determining state boundariesand their uncertainty type and method of computation [Go to Page]
- 7.2.4 Impulse amplitude (state levels)
- 7.2.5 Percent reference levels (state levels, waveform amplitude)
- 7.2.6 Transition settling error (state levels, waveform amplitude)
- 7.2.7 Overshoot aberration (state levels, waveform amplitude)
- 7.2.8 Undershoot aberration (state levels, waveform amplitude)
- 7.3 Temporal parameters [Go to Page]
- 7.3.1 Initial instant
- Table 4 – Variables contributing to the uncertainty in overshoot [Go to Page]
- 7.3.2 Waveform epoch
- 7.3.3 Reference level instants (percent reference levels, waveform epoch, initial instant)
- 7.3.4 Impulse centre instant (impulse amplitude, reference level instants)
- 7.3.5 Transition duration (reference level instants)
- Table 5 – Variables contributing to the uncertaintyin the reference level instant [Go to Page]
- 7.3.6 Transition settling duration (reference level instants)
- 7.3.7 Pulse duration (reference level instants)
- 7.3.8 Pulse separation (reference level instants)
- 7.3.9 Waveform delay (advance) (reference level instants)
- 8 Monte Carlo method for waveform parameter uncertainty estimates [Go to Page]
- 8.1 General guidance and considerations
- 8.2 Example: state level
- Annex A (informative)Demonstration example for the calculation of the uncertaintyof state levels using the histogram mode according to 7.2.1.2 [Go to Page]
- A.1 Waveform measurement
- A.2 Splitting the bimodal histogram and determining the state levels
- Figure A.1 – Waveform obtained from the measurement of a step-like signal from which the state levels and uncertainties are calculated
- A.3 Uncertainty of state levels
- Figure A.2 – Histograms of state s1 (a) and state s2 (b)of the step-like waveform plotted in Figure A.1
- Table A.1 – Uncertainty contributions and total uncertaintyfor level(si) determined from histogram modes
- Annex B (informative)Computation of ΣL and ΣY for estimating the uncertainty of state levelsusing the shorth method according to 7.2.1.3 [Go to Page]
- Figure B.1 – Diagram showing location of waveform elements, y(α)/(β), in Y1 and Y2, and the construction of Y from Y1 and Y2
- Bibliography [Go to Page]
