User`s guide

A-8 Appendix A
0
20
40
60
80
10 100 1000
Frequency (MHz)
5MHz FTT-10 5MHz FTT-10A 10MHz SLTA-10
Field (dBuV/m)
EN 55022-B
EN 55022-A
Figure A.5 EMI Scan Data at 10m Test Distance for EN 55022-B Compliance
SLTA-10 Adpater EN 55022-B Test Scan
Figure A.5 includes EMI test results for Echelon’s SLTA-10 adapters
operating at 10MHz with FTT-10A transceivers. The SLTA-10 adapter is
representative of a moderately complex end product: in addition to a
Neuron 3150 Chip operating at 10MHz, the adapter contains RAM, ROM,
programmable logic, a UART, and a switching power supply. The adapter
was operated without its common-mode ferrite choke in line with the
network connector in order to assess the node emissions without such a
choke, which decreases emissions but adds cost. The EMI test setup for the
SLTA-10 adapter testing is shown in figure A.6.