Comparison of measurement methods for the frequency range of 2 kHz to 150 kHz

Author(s):  
Matthias Klatt ◽  
Jan Meyer ◽  
Peter Schegner
2021 ◽  
Author(s):  
V. Khokhlov ◽  
J. Meyer ◽  
D. Ritzmann ◽  
S. Lodetti ◽  
P. S. Wright ◽  
...  

2019 ◽  
Vol 63 (2) ◽  
pp. 106-111
Author(s):  
Kazimierz Kamuda ◽  
Dariusz Klepacki ◽  
Kazimierz Kuryło ◽  
Wiesław Sabat

The results of measurements of electromagnetic disturbances emitted by LED lamps, in the frequency range from 30 MHz to 300 MHz, which were made using two methods described in the EN 55015/2013 standard have been presented in the paper. In order to compare both methods, each tested lamp was first measured using the traditional method described in Section4.4.2 and then tested by an alternative, equivalent method described in Annex B of the above-mentioned standard. The comparison of results for both methods indicates that using first method, a given LED lamp emits disturbances below the acceptable limits, while the same LED lamp tested with the second method emits disturbances that are at the limit of admissible values. Additionally, used statistical tools in the form of calculated linear correlation coefficient show that the nature of the emission of disturbances measured for the same lamp is very comparable in both methods. The reference of these quasi-peak values to the permissible limits applicable in one or the other method may lead to different decisions.


1980 ◽  
Vol 29 (4) ◽  
pp. 283-288 ◽  
Author(s):  
M. N. Afsar ◽  
A. Bellemans ◽  
J. R. Birch ◽  
G. W. Chantry ◽  
R. N. Clarke ◽  
...  

2018 ◽  
Vol 2018 (1) ◽  
pp. 7-16
Author(s):  
Sławomir Cieślak ◽  
Wiesław Krzymień

Abstract Gyroplanes, as ultralight aircraft, are popular transport vehicles recently. Ultralight aircraft flights take place at a low altitude – their noise is not without effect on people and nature. The localization of the sources of noise and a possibility to decrease the noise of an gyroplane are described in this paper. The rules of design and exploitation of gyroplanes do not define the limits of emitted noise. Gyroplanes are not noisy aircraft vehicles but for their silencing the knowledge about the sources and frequency range of noise is necessary. The goal of the conducted measurement was to determine the gyro-plane noise properties and the noise measurement methods. The evaluation of the noise sources was made by acoustic beamforming and the directional emission with single microphones at various engine speeds. The supplement of these tests should be the rotor noise measurement but that investigation should be performed on a special stand, on which the rotor propulsion noise would not disturb the measurement.


2021 ◽  
Author(s):  
Deborah Ritzmann ◽  
Paul Wright ◽  
Jan Meyer ◽  
Victor Khokhlov ◽  
David De la Vega ◽  
...  

A framework for the comparison of measurement methods of conducted emissions in the frequency range 2-150 kHz is presented. In addition to present non-normative methods published by the IEC, alternative approaches in the literature are considered. Furthermore, test signals and key metrics are described. The comparison results will provide a baseline for specification of a new normative method for power grid measurements.


2008 ◽  
Vol 6 ◽  
pp. 299-301 ◽  
Author(s):  
S. Battermann ◽  
H. Garbe

Abstract. Some emission and susceptibility EMC standards already require measurements above 1 GHz or test site validations (IEC 2006, CISPR 2006). A simple assignment of the established measurement methods below 1 GHz to the frequency range above 1 GHz bears some risks. The ratio between the physical size of the equipment under test (EUT) and the wave-length rises with frequency. This increases the electrical size of the EUT. The directivity may become larger and the radiation pattern of the EUT is getting more complex which reduces the probability to detect the maximum emission with a simple planar cut scan. To analyse these effects in more detail this paper shows radiation characteristics of an exemplary EUT. The influence of a receiving antenna height scan and the angle increment of the turntable scan on the detection of the maximum of the electrical field strength will be discussed. As a result some ideas will be given to reduce the measurement time but keeping the reliability of the measurement results constant.


IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 77618-77630
Author(s):  
Victor Khokhlov ◽  
Jan Meyer ◽  
Anne Grevener ◽  
Tatiano Busatto ◽  
Sarah Ronnberg

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