Echelon LONWORKS PLT-22, User Manual

Page: 125 / 128

Item Check When
Completed
Description
48 The LC resonant frequency of the inductor is at least 1
octave from the communication frequency range (110kHz-
140kHz) when the inductor is combined with the input
capacitance of the switching supply.
49 The power supply complies with the input noise masks
shown in chapter 5.
50 Measurements of the power supply are made by connecting
the supply to the artificial mains network as specified in
subclause 8.2.1 of CISPR Publication 16, second edition.
Measurements are made over the full range of anticipated
loads on the supply and conducted in accordance with
CENELEC EN 50065-1 and FCC measurement standards
with measurement bandwidths of 200Hz below 150kHz and
9kHz above 150kHz, as described in CISPR 16.
51 If the power supply does not meet the appropriate noise
mask for the power supply input, a correct filter is installed
between the local switching power supply and the power
line.
52 All output noise "masks" shown in chapter 5 are satisfied
using measurements taken over the full range of anticipated
loads on the supply.
EMI & ESD Design
Item Check When
Completed
Description
53 The “leakage” capacitance from high frequency circuit traces
is controlled via guard traces.
54 The product's package is designed to minimize the possibility
of ESD hits arcing into the node's circuit board. If the
product's package is plastic, then the PCB is supported in
the package so that unprotected circuitry on the PCB is not
adjacent to any seams in the package. The PCB is not
touching the plastic enclosure near a seam.
55 Explicit clamping of user-accessible circuitry is used to shunt
ESD currents from that circuitry to the center of the star
ground on the PCB.
56 The connector, diodes and decoupling capacitor are all
located close to the center of the star ground.
L
ON
W
ORKS
PLT-22 Transceiver User’s Guide B-7