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26
General remarks regarding the CE marking
General
remarks
regarding
the CE
marking
General remarks regarding the CE marking
General Information Regarding the CE Marking
ROHDE & SCHWARZ measuring instruments comply with
regulations of the EMC Directive. ROHDE & SCHWARZ is
basing the conformity assessment on prevailing generic
and product standards. In cases with potentially different
thresholds, ROHDE & SCHWARZ instruments apply more
rigorous test conditions. Thresholds for business and com-
mercial sectors as well as small business are applicable
for interference emission (class 1B). As to the interference
immunity, the standard thresholds for the industrial sec-
tor apply. Measurement and data lines connected to the
measuring instrument signicantly affect compliance with
specied thresholds. Depending on the respective appli-
cation, utilized lines may differ. In regards to interference
emission and immunity during measurements, it is critical
that the following terms and conditions are observed:
1. Data Cables
It is imperative to only use properly shielded cables when
connecting measuring instruments and interfaces to
external devices (printers, computers, etc.). Unless the
manual prescribes an even shorter maximum cable length,
data cables (input/output, signal/control) may not exceed
a length of 3m and may not be used outside of buildings.
If the instrument interface includes multiple ports for inter-
face cables, only one cable at a time may be connected.
Generally, interconnections require double-shielded con-
necting cables. The double-shielded cable HZ72 (available
at ROHDE & SCHWARZ) is well suitable as IEEE bus cable.
2. Signal Cables
In general, measuring cables for the transmission of sig-
nals between measuring point and measuring instrument
should be kept as short as possible. Unless the manual
prescribes an even shorter maximum cable length, signal
cables (input/output, signal/control) may not exceed a
length of 1m and may not be used outside of buil-dings.
In general, all signal cables must be used as shielded con-
ductors (coaxial cable- RG58/U). It is important to ensure
proper ground connection. Signal generators require the
use of double-shielded coaxial cables (RG223/U, RG214/U).
3. Impact on Instruments
If strong high-frequency electric and magnetic elds are
present, it may occur despite diligent measurement setup
that unwanted signal units are injected into the instrument
via connected cables and lines. This does not result in
destruction or shutdown of ROHDE & SCHWARZ instru-
ments. In individual cases, external circumstances may
cause minor variations in the display and measuring values
beyond the selected specications.
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