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General information regarding the CE marking
HAMEG instruments fulfill the regulations of the EMC directive. The conformity
test made by HAMEG is based on the actual generic- and product standards. In
cases where different limit values are applicable, HAMEG applies the severer
standard. For emission the limits for residential, commercial and light industry
are applied. Regarding the immunity (susceptibility) the limits for industrial
environment have been used.
The measuring- and data lines of the instrument have much influence on
emmission and immunity and therefore on meeting the acceptance limits. For
different applications the lines and/or cables used may be different. For
measurement operation the following hints and conditions regarding emission
and immunity should be observed:
1. Data cables
For the connection between instruments resp. their interfaces and external
devices, (computer, printer etc.) sufficiently screened cables must be used.
Without a special instruction in the manual for a reduced cable length, the
maximum cable length of a dataline must be less than 3 meters long. If an interface
has several connectors only one connector must have a connection to a cable.
Basically interconnections must have a double screening. For IEEE-bus purposes
the double screened cables HZ72S and HZ72L from HAMEG are suitable.
2. Signal cables
Basically test leads for signal interconnection between test point and instrument
should be as short as possible. Without instruction in the manual for a shorter
length, signal lines must be less than 3 meters long.
Signal lines must screened (coaxial cable - RG58/U). A proper ground connection
is required. In combination with signal generators double screened cables (RG223/
U, RG214/U) must be used.
3. Influence on measuring instruments.
Under the presence of strong high frequency electric or magnetic fields, even
with careful setup of the measuring equipment an influence of such signals is
unavoidable.
This will not cause damage or put the instrument out of operation. Small deviations
of the measuring value (reading) exceeding the instruments specifications may
result from such conditions in individual cases.
December 1995
HAMEG GmbH
2


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