Owner's manual

Glossary
73
Current Sinking The ability of a DAQ board to dissipate
current for analog or digital output
signals.
Current Sourcing The ability of a DAQ board to supply
current for analog or digital output
signals.
D
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.
dB Decibel The unit for expressing a
logarithmic measure of the ratio of two
signal levels: dB=20log10 V1/V2, for
signals in volts.
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.
DMA Direct Memory Access: A method by
which data can be transferred to/from
computer memory from/to a device or
memory on the bus while the processor
does something else. DMA is the