Surge tests

AN4160

6/14

DocID023640 Rev 2

Figure 6. IEC61000-4-5 surge application to EUT

3

Surge tests

3.1

Test setup

The setup described below and used for the tests reported in this document is in

accordance with EN50065-2-3.

The equipment under test (one EVALKITST7580-1 as EUT, receiving PLC frames) and a

corresponding device (another EVALKITST7580-1 as stimulus, transmitting PLC frames)

are used to establish that, after applying the surge test, communication between the two

devices is still possible.

The boards are supplied via two separated Isolation Transformers (IT) plus two Line

Impedance Stabilization Networks (LISN) named A and B. LISNs are built according to

EN50065-1 specifications. Measurement ports of the LISNs are terminated in 50 to

maintain the network characteristics.

Two 660 µH inductors are connected between each of the two conductors of the LISN

output, used to provide a controlled signal coupling between the EUT and the stimulus.

The surge generator is connected in parallel with the EUT through the appropriate

Coupling / Decoupling Network (CDN).

Figure 7. Test setup block diagram

Rs = 2

Ω

Rs = 2

Ω

Re = 10

Ω

Neutral

Neutral

EUR

EUR

Line

Line

Earth

Earth

IT

ST7580

Tx

ST7580

Rx

LISN A

LISN B

IT

IT

IT

1.2/50µs surge

generator

2x660µH

Choke

EUT

STIMULUS

CDN