California Instruments 1251RP Series User Manual

1Compliance Test System TutorialCalifornia InstrumentsCTS seriesCompliance VerificationTutorialApplicationNote 119AHarmonicsFlicker

10As mentioned earlier, harmonic currents have negative effects on electricalequipment. Efforts to limit harmonics and set some standards date back to

11Compliance Test System TutorialThe differences between EN60555.2 and EN61000-3-2 touch mainly on threeareas. These are the scope/applicability of th

12Table 1Harmonic Class - A Class-B Class-C Class-D IEC555.2no. (n) limits limits limits limits limits for(both (both IEC1000-3-2 IEC1000-3-2 TVstanda

13Compliance Test System TutorialFigure. 4 shows three parameters, the voltage (sinusoidal) and current wave-form (peaky) and the Class-D envelope (st

14When the test circuit for the EN61000-3-2 was determined, the approach wasto make sure that harmonics were acceptable, even in the worst case condit

15Compliance Test System TutorialNaturally, the power source is not allowed to affect the current harmonic lev-els. Since the “ideal” power source doe

16The DSP sub-system in the PC samples at very high rates, in excess of 200KHz depending on the configuration, and thus produces accurate waveform and

17Compliance Test System TutorialTo determine acceptable voltage fluctuation levels, a large group of individualswas subjected to light flicker from t

18The basic measurement for Flicker is theRMS voltage level per half cycle of the 50 Hzfundamental frequency. Thus, the RMS level ismeasured 100 times

19Compliance Test System TutorialThese impedance values differ fortesting to the (new) Japanese ver-sion. For current levels < 20 Amp ina 2 wire 10

2Copyright 1998 - 2000, California Instruments

20For a number of products, Pst and Plt do not need to be evaluated, i.e. onlythe “dt” and “dc” parameters have to be checked. Furthermore, if the par

21Compliance Test System Tutorial Voltage Modulation Theoretical Measured with Measured with Fluctuation frequency in Pst level OMNI Reference synth

22The CTS configura-tion table by powerlevelTable 3Single Phase SystemsVA Power RMS Current Peak Current Power Source@ 230 Vac @ 230 VacPACS-1 none &l

23Compliance Test System TutorialThis appendix discusses the implementation of the EN61000-3-2 andEN61000-3-3 standards in the California Instruments

24For the Compliance Verification, equipment with NIST traceable calibrationwas used. The primary equipment consisted of relatively standard electroni

25Compliance Test System TutorialVoltage levels are to be maintained with ± 2 %, and frequency changesmust be < ± 0.5 %The CTS 2.0 software monitor

26For Transitory harmonics (fluctuating) the CTS analyzes the data every 320ms or 200 ms without gap or overlap in the data. This may be verified by t

27Compliance Test System TutorialThe Flicker Meter consists of the CTS signal conditioner, AC source withbuilt-in Reference Impedance per IEC-725, com

28The standard states that overall accuracy must be better than ± 8 %, whichincludes any inaccuracies in the IEC-725 Reference Impedance, as well as m

29Compliance Test System TutorialBoth Harmonics and Flicker tests require the AC source to meet specificoutput characteristics. California Instruments

3Compliance Test System TutorialContentsIntroduction ...

30With the load connected, harmonic distortion measurements must be made.Since it is unlikely that each individual current harmonic of the load is exa

31Compliance Test System Tutorialn Load Current Voltage Distortion InterpolatedDistortion12 3 4 5 6Harm. Actual Spec Actual Spec Limit D%=(IA) Lim (IL

32Contact California Instruments:Toll-Free: 800-4AC-POWER800-422-7693FAX: 858-677-0940Email: [email protected] page: http://www.calinst.com9689 Tow

4This page intentionally left blank

5Compliance Test System TutorialThis tutorial provides a basic understanding and background for EN61000-3-2 (harmonics) and EN61000-3-3 Flicker (Volta

6In the last two decades, the quality of electrical power has decreased invarious industrialized nations. This is primarily due to the increased use o

7Compliance Test System TutorialJapan has adopted a national standard which differs from the IEC 61000-3-2/3 documents, as their power distribution di

8Figure 1 shows a screen capture of the voltage and current waveform of this19 inch VGA monitor operating on 230 Vac - 50 Hz. The CTS system displayst

9Compliance Test System TutorialTransformers may also overheat due to harmonic currents and motors areaffected negatively as well. Several of the high