Maintenance; Changing The Mains Voltage And Fuse; General - Hameg HM6050-2 Benutzerhandbuch

surement, functional test). This helps ensure the
continued safety of the product.
Do not obstruct the ventilation holes!

Maintenance

The instrument does not require any maintenance.
Dirt may be removed by a soft moist cloth, if
necessary adding a mild detergent. (Water and 1
%.) Grease may be removed with benzine (petrol
ether). Displays and windows may only be cleaned
with a moist cloth.
Do not use alcohol, solvents or paste.
Under no circumstances should any
fluid be allowed to get into the instru-
ment. If other cleaning fluids are used
damage to the lacquered or plastic
surfaces is possible.

Changing the mains voltage and fuse

The internal power supply unit of the HM6050-2
contains a fuse.
At delivery (ex factory) the HM6050-2 is set to
the mains voltage according to the country the
instrument is going to be operated.
I m p o r t a n t h i n t s

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 Artificial Hand and a PE simulating
networkwhich can be bridged.
Conducted emissions on AC power lines, which
are typically generated by electricalequipment,
can be verified with the help of a LISN together
with a Spectrum Analyzer/EMCReceiver. The DUT
(device under test) must be connected directly to
the LISN. Inside the LISN the power lines are ter-
minated with a well-defined impedance network,
against each other and against ground.
The HM6050-2 Line Impedance Stabilization
Network (LISN) in principle is a filter network.
Through a low pass filter the DUT is connected
to the AC power lines. The LISN also presents
a well-defined impedance to the signal. For
measurements with a Spectrum Analyzer/EMC
Receiverthe EMC signal is available after having
passed a high pass filter.
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.
EMC measurement procedures
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:
1. Set HM6050-2 into operation (power on)
(Transient limiter in active status; LED off)
2. Set DUT (Equipment under test) to operation
3. Set Spectrum Analyzer/Test Receiver to ope-
ration
4. Connect HM6050-2 to the input jack of the
Spectrum Analyzer/TestReceiver via a coaxial
HF cable.
Subject to change without notice
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