Glossary - Addi-Data APCI-3701 Technical Description

Glossary

12 GLOSSARY
Term
A/D converter
Acquisition
Analog
Clock
D/A converter
Data acquisition
DC voltage
Differential inputs
(DIFF)
Disturb signal
Driver
Edge
FIFO
Gain
Ground
Half-bridge
70
Table 12-1: 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
A circuit that generates time and clock pulses for the
synchronisation of the conversion
= 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.
An analog input with two input terminals, neither of which is
grounded, whose value is the difference between the two
terminals.
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.
Logic levels are defined in order to process or show
information. In binary circuits voltages are used for digital units.
Only two voltage ranges represent information. These ranges
are defined with H (High) and L (Low). H represents the range
that is closer to Plus infinite; the H level is the digital 1. L
represents the range that is closer to Minus infinite; the L level
is the digital 0. The rising edge is the transition from the 0-state
to the 1-state and the falling edge is the transition from the 1-
state to the 0-state.
= First In First Out
First-in/first-out memory buffer. 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.
With the core in the central position the two signals VA and VB
are equal and half the energising signal VA. As the core is
displaced, VA and VB vary in a complimentary fashion.
Description
APCI-3701