16 Subject to change without notice
General remarks regarding the CE marking
HAMEG measuring instruments comply with the EMI
norms. Our tests for conformity are based upon the
relevant norms. Whenever different maximum limits are
optional HAMEG will select the most stringent ones. As
regards emissions class 1B limits for small business will be
applied. As regards susceptability the limits for industrial
environments will be applied. All connecting cables will
influence emissions as well as susceptability considerably.
The cables used will differ substantially depending on
the application. During practical operation the following
guidelines should be absolutely observed in order to
minimize EMI:
1. Data connections
Measuring instruments may only be connected to external
associated equipment (printers, computers etc.) by using
well shielded cables. Unless shorter lengths are prescribed
a maximum length of 3 m must not be exceeded for all data
interconnections (input, output, signals, control). In case an
instrument interface would allow connecting several cables
only one may be connected. In general, data connections
should be made using double-shielded cables. For IEEE-bus
purposes the double screened cable HZ72 from is suitable.
2. Signal connections
In general, all connections between a measuring instrument
and the device under test should be made as short as
possible. Unless a shorter length is prescribed a maximum
length of 3 m must not be exceeded, also, such connections
must not leave the premises. All signal connections must be
shielded (e.g. coax such as RG58/U). With signal generators
double-shielded cables are mandatory. It is especially
important to establish good ground connections.
3. External influences
In the vicinity of strong magnetic or/and electric fields
even a careful measuring set-up may not be sufficient
to guard against the intrusion of undesired signals. This
will not cause destruction or malfunction of HAMEG
instruments, however, small deviations from the guaranteed
specifications may occur under such conditions.
G e n e r a l r e m a r k s r e g a r d i n g t h e C E m a r k i n g
www.allice.de
Allice Messtechnik GmbH
