Каталог Weidmuller: Electronics - Analogue Signal Conditioning

Technical appendix/Glossary
Glossary
Glossary
1-9
2-way isolation
3-way isolation
The input and output signals are separated electrically from each other and
decoupled. Potential differences caused by long wire lengths and common reference
points are eliminated.
Also decouples the power supply to the input and output circuit and enables supply
with only one operating voltage.
A
A/D converter
AC
Accuracy
Active sensor
Actuator
Alarm contact
Ambient temperature
Analogue signal
Converts standardised analogue current and voltage signals into an 8-bit, 12-bit
or 16-bit digital signal. It may be necessary to convert analogue signals into digital
signals when you need the analogue signal from the surroundings to work with the
typical digital processing requirements of process monitoring.
Alternating current
Describes the ability of an analogue signal isolating converter to transmit a measured
value as precisely as possible. It is specified in the percent deviation from the
measuring range end value at room temperature.
In an active sensor, an electrical signal is generated from the measurement itself, for
example dynamometric or piezo-electric. Thus no auxiliary power source is required.
Because of their physical operating principals (since energy cannot be sent during
the static and quasi-static states), only a change in the measured variable can be
detected.
The actuator is a sensor counterpart – it converts electrical current into another form
of energy.
A switching contact that activates when a disturbance occurs (for example, an
overload or short circuit).
DIN EN 60204-1 uses this term to refer to the temperature of the surrounding air
or medium at which the equipment can be properly and safely operated. This is a
part of the surrounding physical and operational conditions. Failure to maintain this
temperature level can invalidate the product warranty.
A signal is designated as an analogue signal if it transmits parameter information
that is infinitely variable between a minimum and maximum value (this includes
instantaneous values such as current, voltage or temperature). This applies to
practically all real-world processes or states. It is theoretically possible to register
any small signal changes (there is a very large dynamic range).
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