Description:
EMI compliance testing consists of a far field emissions measurement. There is no definitive relationship between near and far field measurements. Though near field measurements generally don’t directly correlate with far field measurements, the near field measurement is still an excellent troubleshooting tool. Near field measurements can help in identifying ground plane gaps, as well as locating leaks in enclosures, connectors and EMI seals. It can also be used to identify source characteristics that can be used to determine the source of the emissions in a subsequent far field measurement. This demonstration will measure the EMI emissions over the POL circuit.

Description:
Printed circuit board planes resonate when not properly terminated. Using a high frequency VNA we can see these high frequency resonances. Parallel capacitors can also resonate with each other and/or with the PCB planes, resulting in circuit noise and EMI. This test measures the resonance of the planes and capacitors on the PLANES and CAPS section of the VRTS3 board.