User`s guide

LONWORKS FTT-10A Transceiver User’s Guide 5-7
IEC Electromagnetic Compatibility (EMC) Testing
Echelon has tested the FTT-10A transceiver operating in typical two-layer
application boards to verify that the transceiver complies with the four applicable
IEC 1000-4 test requirements. As long as a node's PCB is designed following the
guidelines in chapter 2, the FTT-10A transceiver should pass the following IEC
1000-4 tests:
Table 5.1 IEC 1000-4 Test Descriptions
IEC Test Description Level
1000-4-2 (formerly 801-2) ESD Level 4
1000-4-3 (formerly 801-3) Radiated
Susceptibility
Level 3
1000-4-4 (formerly 801-4) Burst Level 4
1000-4-5 (formerly 801-5) Surge Level 3
IEC 1000-4-2 ESD testing is performed on a metal test table using an ESD
transient generator
13
. Level 4 testing involves injecting up to ±8kV contact
discharges and up to ±15kV air discharges into the product under test. Depending
on the product design, discharges may be injected at the network connector, power
connector and other user-accessible areas. Under the test, proper operation
continues with occasional loss of a packet and infrequent node reset.
IEC 1000-4-3 RF Susceptibility testing is generally performed in an RF-shielded
anechoic chamber
14
. The product under test is placed on a non-conducting table
in the chamber, and antennas are used to subject the product to intense radio
frequency fields. Under the test, proper operation continues with occasional loss
of a packet. Level 2 testing is performed with a field of 3V/m, which is classified
by the test standard as a "Moderate electromagnetic radiation environment."
Level 3 testing is performed with a field of 10V/m, which is classified by the
standard as a "Severe electromagnetic radiation environment."
IEC 1000-4-4 Burst testing is performed on a non-conducting table, with 1 meter of
the network cable clamped in a high-voltage burst generation apparatus
15
.
Under the test, proper operation continues with occasional loss of a packet. There
are three bursts injected onto the network cable each second. Level 3 testing is
performed with ±1kV bursts, which are classified by the test standard as
representative of a "Typical industrial environment." Level 4 testing is
performed with ±2kV bursts, which are representative of a "Severe industrial
environment."
IEC 1000-4-5 Surge testing is performed on a non-conducting table using
specialized surge generation equipment
16
. The surges are injected directly into
the network wiring via a coupling circuit. See figure 10 of IEC 1000-4-5 (formerly
figure 11 of IEC 801-5). Under the test, proper operation continues with occasional
loss of a packet. Level 2 testing is performed with up to ±1kV surges, and Level 3
testing is performed with up to ±2kV surges.