| The EMC Directive Tests |
|
| The EMC Directive Tests |
|
 |
0.15-30MHz conducted on mains cables An artificial mains network (AMN) is inserted into the cable and a measuring receiver is used to measure the conducted voltages on the cables |
|
|
30-1,000MHz radiated The measurements are made on an open area test site (OATS) to prevent reflections which would otherwise distort the measurements. An antenna is placed, typically, 10m from the DUT and connected to a measuring receiver and allows the field strength at the antenna to be calculated |
|
|
0-2kHz harmonics, AC mains cable A wave analyser is connected in series with the DUT to measure the harmonic currents up to the 40th harmonic |
|
Conducted 0.15-80MHz A coupling/decoupling network (CDN) is used to directly couple RF energy from a power amplifier into power supply and signal/control leads of the DUT |
|
Radiated 80-1,000MHz The DUT is radiated using an antenna in an absorber-lined shielded enclosure over the frequency range specified using amplitude modulation. Alternative methods, such as a GTEM cell, are possible for small DUTs |
|
Radiated 900MHz As Radiated 80-1,000MHz but using a signal representing digital modulation |
|
Power frequency magnetic fields (50Hz) The DUT is subjected to power frequency magnetic fields using an induction coil or Helmholtz coil to generate the magnetic field |
|
Fast transient bursts The DUT is connected to a transient generator which injects transients with the appropriate parameters into the power and signal/control cables. A capacitive coupling clamp is used for non-power supply cables |
|
Surges As Fast transient bursts, except that a surge generator is used in place of a transient generator and a capacitive clamp is not used |
|
Electrostatic discharge (ESD) An ESD ‘gun’ is used to inject discharges directly onto exposed parts of the system and onto horizontal and vertical coupling planes, the latter to simulate discharges in the near vicinity |
|
Mains voltage dips A suitable generator is used to replace the mains power supply with the required waveform |
|
Mains voltage interruptions Same as Mains voltage dips |
