EMC Equipment

Harmonics & Flicker Analyzer

 

Harmonics & Flicker Analyzers measure and simulate disturbances in the public power supplies. The increasing use of electronic equipment fitted with switch mode power supplies has led to an increase in distortion of the public power supply. Such loads draw non sinusoidal current, which contains harmonic frequencies at multiples of the 50Hz and 60Hz supply frequencies. This can lead to significant currents flowing in the neutral conductor resulting in cable and transformer overheating. 

Small variations in the mains supply voltage, caused by fluctuating currents interacting with the mains impedance, influence the light intensity of an incandescent bulb. Light intensity fluctuates as a square of the RMS voltage. These cyclic fluctuations called flicker are not noticed by the human eye but are registered by the brain, causing annoyance and increased stress. In extreme cases they can trigger headaches or epileptic attacks in susceptible people. Power factor correction is a simple means of reducing flicker. 


POWER FREQUENCY TEST SYSTEM BROCHURE


HAR1000-1P & HAR-EXT1000

HAR1000-1P & HAR-EXT1000

 

The HAR1000 test system is a compact solution to determine harmonic and flicker emissions generated by equipment connected to the public power main. HAR1000-1P is the single phase version and comprises a power amplifier, line impedance network, harmonics and flicker measurement all in a single unit. HAR-EXT1000 added to HAR1000-1P provides full three phase capability. The hardware is controlled from a powerful computer based software (HARCS). 

The HAR1000 test system uses amplifier technology to correct power main distortion which reduces size, weight and cost compared to traditional systems since a dedicated external power source is not needed. A small power amplifier is used to correct power main distortion and deliver a clean sine wave to the EUT. While the measurements are being made, the test voltage at the terminals of the equipment under test, when operated according to the defined operating condition, will meet the requirements laid down in the IEC standards.

Control, data collection and report generation are available from the HARCS software interface which is provided as part of the system package. HARCS IMMUNITY extends HARCS software to include the immunity package which provides a low cost means to perform additional testing for harmonic immunity, voltage fluctuations and ripple on DC supplies. 


Standards

  • IEC 61000-3-2
  • IEC 61000-3-3
  • IEC 61000-4-7
  • IEC 61000-4-13
  • IEC 61000-4-14
  • IEC 61000-4-15
  • IEC 61000-4-28

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