Каталог Weidmuller: Electronics - Analogue Signal Conditioning

General technical information
Technical appendix/Glossary
by a permissible loss of performance. If the minimal performance
level or permissible loss of performance is not specified
by the manufacturer, both of these specifications can be derived
from the description of the product, the relevant documentation
and from what the operator expects from the equipment during
its intended operation.
Criterion B
The equipment shall continue to operate as intended after
the test. No degradation of performance or loss of function is
allowed below a minimum performance level as specified by
the manufacturer, when the equipment is used as intended.
In certain cases the minimal performance level can be replaced
by an permissible loss of performance. During testing degradation
of the performance level is permitted; however, changes
to the specified operation mode or data loss are not permitted.
If the minimal performance level or permissible loss of performance
is not specified by the manufacturer, both of these specifications
can be derived from the description of the product, the
relevant documentation and from what the operator expects
from the equipment during its intended operation.
Measures
• Install the products in a metal enclosure (control cabinet,
metal housing).
• Protect the voltage supplies with a surge protection device
• Use only shielded cables for analogue data signals.
• Apply ESD measures during installation, maintenance and
operation.
• Maintain min. 200 mm clearance between electronic modules
and sources of interference (e.g. inverters) or power lines.
• Ensure ambient temperature and relative humidity values do
not exceed those specified.
• Protect long cables with surge protection devices.
For safety reasons, do not operate walkie-talkies and mobile
telephones within a radius of 2 m of the equipment.
Criterion C
Temporary loss of function is allowed, provided the loss of function
is self-recoverable or can be restored by the operation of
the controls.
Criterion B is most frequently specified in the generic standards
and is used by Weidmüller.
Taking the example of a WAVEANALOG analogue coupler:
During testing, the analogue coupler may convert values that lie
outside the permissible tolerances. After testing, however, the
values must lie within the given tolerances.
General installation instructions
In conformity with the performance level and criteria A and B,
the products may and can be affected by external influences
during a fault. However, the aim should be to suppress this as
far as possible by means of an optimum installation.
W
W.23