AN3031

EMC testing

Doc ID 16144 Rev 1

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EMC testing

The EMC requirements according to the IEC 61131-2 standard have been verified.

Application tests show much better results than given by the industrial standard. Test

requirements and results are listed in the table below. No additional protection devices have

been used in the application.

Table 2.

EMC immunity test requirements and results

Minimum requirements of international

standards

Robustness of the STEVAL-IFP007V1

Tests conditions

Levels

Tests conditions

Levels

Behavior of

the SCLT3-

8BT8

ESD test

IEC61000-4-2

Air discharge

±8 kV

±8 kV

Contact discharge

±4 kV

±6 kV

Burst test

IEC61000-4-4

Analog input

±1 kV

±4 kV

1.

Primary and secondary grounds of the optocouplers have been coupled with a 10 pF capacitor

2.

Forced input filtering capacitors to maximize EFT immunity (C40 - C55 = 22 nF) with a drawback of bandwidth reduction

(<10 kHz).

No failure, no

disturbance

DC power line

±2 kV

SPI signals R-C filter:

220

Ω - 100 pF

Surge test

IEC61000-4-5

Analog input

42

Ω, 0.5 µF

differential and

common mode

±0.5 kV

Analog

input

No failure,

temporary

disturbance

DC power line

2

Ω, 18 µF

differential mode

±0.5 kV

DC power

line

±2 kV

12

Ω, 9 µF

common mode

±1 kV

±2 kV

Conducted

disturbance

test

IEC61000-4-6

150 kHz to

80 MHz

22 nF capacitors

at the output

AM ±

80%

150 kHz to

80 MHz

the INPUT

AM ± 80%

No failure, no

disturbance

Reverse input

polarity test

on the others

No failure, no

cross-talk