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APCI-1032, APCI-1564 and APCI-2032
10
GLOSSARY
Term
A/D converter
Acquisition
Analog
Bus
Clock
Creeping distance
D/A converter
Data acquisition
DC voltage
Digital signal
Disturb signal
Driver
FIFO
Gain
Ground
Impedance
Inductive loads
Table 10-1: Glossary
= ADC
An electronic device that produces a digital output directly
proportional to an analog signal output.
The process by which data is gathered by the computer for analysis
or storage.
Continuous real time phenomena
The group of conductors that interconnect individual circuitry in a
computer. Typically, a bus is the expansion vehicle to which I/O or
other devices are connected. Examples of PC buses are PCI, PC Card
(PCMCIA), ISA (AT), and EISA bus.
A circuit that generates time and clock pulses for the synchronisation
of the conversion
In order to avoid the danger of the effects of electrical voltages and
currents for electrical-mechanical components, it is required to keep
minimum isolation distances. The creeping distance is the shortest
distance alongside of an isolation surface between two reference
points (contact elements).
= DAC
A device that converts digital information into a corresponding
analog voltage or current.
Gathering information from sources such as sensors and transducers
in an accurate, timely and organized manner. Modern systems
convert this information to digital data which can be stored and
processed by a computer.
= Direct current voltage
DC voltage means that the voltage is constant respecting the time. It
will always fluctuate slightly. Especially at switching on and
switching off the transition behaviour is of high significance.
A signal which has distinct states. Digital computers process data as
binary information having either 1 or 0 states.
Interferences that occur during the transfer caused by reduced
bandwidth, attenuation, gain, noise, delay time etc.
A part of the software that is used to control a specific hardware
device such as a data acquisition board or a printer.
= First In First Out
The first data into the buffer is the first data out of the buffer.
The factor by which an incoming signal is multiplied.
A common reference point for an electrical system.
The reciprocal of admittance. Admittance is the complex ratio of the
voltage across divided by the current flowing through a device,
circuit element, or network.
The voltage over the inductor is U=L.(dI/dt), whereas L is the
inductivity and I is the current. If the current is switched on fast, the
voltage over the load can become very highly for a short time.
Description
Glossary
63
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