User manual

17
Subject to change without notice
Setting Into Operation
2 General
The HM6050-2 Line Impedance Stabilization Net-
work (LISN) meets standards VDE 0876 and CISPR
Publ. 16. It contains aircore inductance coils and
features an Articial Hand and a PE simulating net-
workwhich can be bridged. Conducted emissions
on AC power lines, which are typically generated
by electricalequipment, can be veried with the
help of a LISN together with a Spectrum Analyzer/
EMC-Receiver. The DUT (device under test) must
be connected directly to the LISN. Inside the LISN
the power lines are terminated with a well-dened
impedance network, against each other and against
ground.
The HM6050-2 Line Impedance Stabilization Net-
work (LISN) in principle is a lter network. Through
a low pass lter the DUT is connected to the AC
power lines. The LISN also presents a well-dened
impedance to the signal. For measurements with a
Spectrum Analyzer/EMC Receiverthe EMC signal is
available after having passed a high pass lter. Two
identical networks provide the asymmetric noise
emission signals of the DUT’s power lines L1 and
N. The user can choose between the signals, the
selected one will be available at the HM6050-2’s test
signal outlet. The stabilization network (simulationfor
the AC power lines) is arranged in formof a "V". If
working with a Spectrum Analyzer/EMC Receiver it is
highly recommended to enable the built-in Transient
Limiter of the HM6050-2.
2.1 EMC measurement procedure
Measurements have to be performed according to
the VDE regulations VDE 0877 Part 1. After the test
setup is completed according to the regulations one
can begin with the measurement procedures.
Follow these procedure steps:
❙ Set HM6050-2 into operation (power on),
transient limiter is activated (LED off)
❙ Set DUT (device under test) to operation
❙ Set spectrum analyzer/Test Receiver to operation
❙ Connect HM6050-2 to the input jack of the
spectrum analyzer / test receiver via a coaxial HF
cable.
3 Setting Into
Operation
Only qualified personnel are allowed to set up
the LISN into operation. The HM6050-2 has been
designed in conformity to regulations VDE 9876
and CISPR Publ. 16. The leakage current of the
instrument exceeds the allowed value of 0.5 mA
eff
as dened in IEC 348 and VDE 411 for normally ope-
rating measurement instruments. Thus, the safety
requirements have to be accomplished by additional
provisions according to IEC364-4-41 (CENELEC HD
384.4.41 and VDE 0100 Part410). Due to the circuitry
of the HM6050-2 a maximum leakage currentof
800 mA can occur. It is not possible to operate the
HM6050-2 at a mains outlet with a leakage current
circuit breaker.
To put the HM6050-2 into operation it has to be
connected to an AC power outlet (with protec-
tive ground) according to VDE-0100. Due to the
relative high leakage current (ca. 800 mA) the
equipment cannot be operated in combination
with a leakage current circuit breaker. Thus,
“protective ground” is equivalent to“earth”.
Any interruption of the protective ground
conductor inside or outside the instrument
is prohibited.
Attention! Danger of death!
The LISN has to be grounded accor-
ding to the regulations (Cenelec HD384/DIN
VDE0100) separately; otherwise conductive
parts of thehousing, which may be touched by
the user, lie on a dangerous high voltage level.