Glossary
G-10
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relative accuracy
A measure in LSB of the accuracy of an ADC; it includes all nonlinearity
and quantization errors but does not include offset and gain errors of the
circuitry feeding the ADC.
resolution
The smallest signal increment that can be detected by a measurement
system. Resolution can be expressed in bits, in proportions, or in
percent of full scale. For example, a system has 12-bit resolution, one
part in 4,096 resolution, and 0.0244 percent of full scale.
ROI
Region of interest. A hardware-programmable rectangular portion of the
acquisition window.
ROM
Read-only memory.
RS-170
The U.S. standard used for black-and-white television.
RSE
Referenced single-ended. All measurements are made with respect to a
common reference measurement system or a ground. Also called a
grounded measurement system.
RTSI bus
Real-Time System Integration Bus. The National Instruments timing bus
that connects IMAQ and DAQ boards directly, by means of connectors on
top of the boards, for precise synchronization of functions.
S
s
Seconds.
scaling down circuitry
Circuitry that scales down the resolution of a video signal.
scatter-gather DMA
A type of DMA that allows the DMA controller to reconfigure on-the-fly.
sync
Tells the display where to put a video picture. The horizontal sync indicates
the picture’s left-to-right placement and the vertical sync indicates
top-to-bottom placement.
syntax
The set of rules to which statements must conform in a particular
programming language.
system RAM
RAM installed on a personal computer and used by the operating system,
as contrasted with onboard RAM.