Emi Radiated Measurements; Emi Measurement Setup; Emi Measurement Results - Infineon MERUS MA120 Series User Manual

User manual for MA120xxx reference boards
Measurement results
3.5

EMI radiated measurements

3.5.1

EMI measurement setup

LINEAR POWER
SUPPLY
DEVICE
AUDIO
UNDER
SOURCE
TEST
TURN TABLE
Figure 16 EMI measurement set-up for radiated emission test
Figure 16 shows the set-up for testing.
Measurement results were obtained under the following conditions:
Linear power supply: 18 V PVDD

Pink noise test signal output power at 20 dB gain = 1 W average output power per channel

Speaker cable length: 10 cm

Amplifier load: 4 Ω speaker (Visaton FR 10 WP)

EMI filter: Murata ferrite BLE32PN300SN1L + 1 nF capacitor

Pi filter on PVDD – Würth ferrite 74279221100 + 2 x 22 nF capacitor

3.5.2

EMI measurement results

EMI-radiated results were collected for the reference board using four scenarios:
Board was positioned toward the antenna and the antenna was vertical (Figure 17)

Board was positioned toward the antenna and the antenna was horizontal (Figure 18)

Board was positioned perpendicular to the antenna and the antenna was vertical (Figure 19)

Board was positioned perpendicular to the antenna and the antenna was horizontal (Figure 20)

Application Note
EMC chamber
Speakers
20 of 28
R&S Spectrum
Analyzer
Test PC
V 1.0
2019-04-28