User manual

Appendix E: Glossary
132
DAC Conversion Start signal used to start the conversion
process of digital value to an analog
output. The source of this signal can be
either an internal DAC synchronous
clock or an external asynchronous
signal. This is a common signal fed to
both DACs.
DAQ Data Acquisition
(1) Collecting and measuring electrical
signals from sensors, transducers, and
test probes or fixtures and inputting
them to a computer for processing;
(2) Collecting and measuring the same
kinds of electrical signals with A/D
and/or DIO boards plugged into a PC,
and possibly generating control signals
with D/A and/or DIO boards in the
same PC.
Data point Digitized data from one or more
channels taken at the same or virtually
same time.
dB Decibel The unit for expressing a
logarithmic measure of the ratio of two
signal levels: dB=20log10 V1/V2, for
signals in volts.
Differential Input An analog input consisting of two
terminals, both of which are isolated
from computer ground, whose
difference is measured.
DIO Digital input/output.
DLL Dynamic Link Library A software
module in Microsoft Windows
containing executable code and data
that can be called or used by Windows
applications or other DLLs. Functions
and data in a DLL are loaded and linked
at run time when they are referenced
by a Windows application or other
DLLs.