NARDA PMM L3-64, User Manual

Page: 11 / 42

General Information 1- 1
1 - General Information
1.1 Documentation
1.2 Introduction to PMM
Artificial Mains
Networks
Enclosed with this manual are a service questionnaire to send back to
NARDA in case of equipment service is needed, and an accessories check
list to verify all accessories enclosed in the packaging.
The objective of EMI Conducted tests is to define the amplitude of current I
c
and Voltage V
c
emission from the Device Under Test (DUT) onto the power
mains or to define the immunity of the DUT to the conducted interference.
The mains lines themselves do not allow for reliable EMI measurements
since their impedance is subject to marked variations that generates
different test results at different test sites.
The PMM Artificial Mains Networks are LISN used for RFI measurements
on AC three-phase, power supplied electric and electronic equipment
usable from DC to 60 Hz.
The LISNs are three line V-network with an equivalent circuit of 50 ohm //
(5ohm + 50
µ
H), fully compliant with CISPR publ. 16, VDE 0876 and FCC
part 15 regulation.
The LISNs are suited to perform measurements on conducted interference
in the frequency range from 9 kHz to 30 MHz.
Designed according to criteria of cheaply and compactness they can be
used together with PMM Systems for Conducted Interference or any other
RF receiver.
The main functions performed by the Artificial Mains Network are:
•
terminate the DUT with a standardized impedance against reference
ground;
•
supply power to the DUT;
•
insulate the test circuits against external interference coming, for
example, from AC-voltage network;
•
route the EMI (Electro Magnetic Interference) of the DUT to the receiver,
in case of conducted emission measurement, and the EMI from the
signal generator to the DUT, in case of susceptibility test (current
injection).
The PMM LISNs are provided with a standard industrial power sockets, with
a pilot conductor connector provided.
According to EN 60309 (IEC 309) Normative the pilot conductor can be
used to operate a remote control switch, to avoid any mains connector
operation with high current load.
Document L3EN-70206 - © NARDA 2007