Get information on products and offers of ELKO EP
Electromagnetic compatability (EMC) is a new scientifi c fi eld which was founded in the 60s last century. It had been known only to a small number of specialists working in a military and cosmic research. Electromagnetic compatability EMC is defi ned as an ability of a device, system or a machine to show the correct operation even in an environment in which tehe are other sources of electromagnetic signals ( natural or artifi cial), and also an ability not to infl uence negatively the environment by its own “electromagnetic action” and not to radiate signals
that would disturb other devices. It is an indicator of good quality and reliability. Breach of such EMC requirements may cause several damages with catastrophical consequences. When testing EMC of a device ( technical and biological), basic is represented by so called "fundamental chain of EMC" shown in the picture. This chain shows a system problematic of EMC and we inspect all three components.
Test SURGE
For guarantee the immunity of our devices against to electromagnetic disturbance we are doing EMC tests and according results we are still innovating our product to be accoding the EMC norms with reserve.
The most important test is immunity against gust of high-energy voltage and current impulse (SURGE), what is made according the norm IEC 61000-4-5.
By this are controlled our products in case of short time pulse, what is apllicated as to input as to output circuits of divices, to switching inputs, sensing inputs,.. Our produts pass all criterias and are fully
competitive to foreign products.
Test SURGE is used in practice mainly for 1-phase devices with take-off current to 16 A. It makes use of voltage impulse 1,2/50 ms no load and current impulse 8/20 ms for short time. Size of used voltage
impulse is 0.5 kV, 1 kV, 2 kV and 4 kV, size of used current impulse is 2kA on 4kV with choise of changing polarity. For testing by impulses is as coup mode specify capacitive coup .
Test BURST
Other very important test is test immunity against quick short-lived eff ect (couple of impulses- BURST) , which dissimulated infl uence if industry disturbance. Test is made according the norm IEC 61000-4-4.
Disturbance signal is injected to supply circuits and communication cabling. Coupling is made by 1-phase capacitive circuit or coupling capacitive ribband to supply, signalling or data convection of tested device. Size of testing impulses is 0,5 kV, 1 kV, 2 kV and 4 kV in possitive and negative polarity. Repeat frequence is 2.5 kHz, or 5 kHz. Period of testing 0 - 6 minut by steps for 0.1s.
Test POWERFAIL
For right function of products in industry is important POWERFAIL test - simulation of decreasing and failure of supply voltage. Made according the IEC 61000-4-11.
Short-time supply decreasing are random decreasing of supply voltage, which are more than 10 - 15 % of its nominal size and have short time existing 0.5 - 50 periodes of basic frequency 50 Hz.
Short breaks of voltage are short time decreasing over 100 %. Mentioned changes of supply circuit voltage are made in practise by disturbance in mains (high voltage, low voltage ) and breaks on load of the main.
Test of EMC EMISSIONS
Electronic devices must be designed not to be a source of oversize electric or electromagnetic disturbances in its surroundings. Test is executed according to standard EN 55022.
Emissions are measured by wires or by air.
Test OF ELECTROMAGNETIC HIGH-FREQUENCY FIELD AND HF SIGNAL COMING FROM THE MAIN
The purpose of this test is to verify immunity of the device against electromagnetic fi elds that are created by radio transmitters or by any other device which transmits electromagnetic energy by uninterrupted waves (walkie-talkies, radio and TV transmitters.)
Test is carried out against disturbances in the main and emissions. We apply testing level 3 which for HF fi eld means intensity of fi eld 10 V/m and for HF signal it is voltage level 10 V.
Test OF ELECTROSTATIC DISCHARGE
It is a test of resistance against discharges of electrostatic energy caused by servicing or by surrounding objects. Such discharge can damage a device or its components.
Test is carried out by direct or indirect application of discharges to a tested device. Test is carried out according to a standard EN 61000-4-2. Direct influence of discharges is targeted into such places and surfaces that are accessible to servicing during common use. Indirect influence of discharge is done by horizontal and vertical coupling board.
The device is treated by at least ten individual discharges for positive and negative polarity. testing levels are 2kV, 4kV, 6kV, 8kV, 15kV.
