G-20
©
National Instruments Corporation
Glossary
system RAM
RAM installed on a personal computer and used by the operating system,
as contrasted with onboard RAM
system noise
a measure of the amount of noise seen by an analog circuit or an ADC when
the analog inputs are grounded
T
TC
terminal count
T/H
track-and-hold—a circuit that tracks an analog voltage and holds the value
on command
Theorem
signal contains no frequency components higher than half the frequency at
which it is sampled, then the original signal can be recovered without
distortion
throughput rate
the data, measured in bytes/s, for a given continuous operation, calculated
to include software overhead. Throughput Rate = Transfer Rate Software
Overhead Factor.
top-level VI
VI at the top of the VI hierarchy. This term is used to distinguish the VI
from its subVIs.
transfer rate
the rate, measured in bytes/s, at which data is moved from source to
destination after software initialization and set up operations; the maximum
rate at which the hardware can operate
TRIG
trigger signal
trigger
any event that causes or starts some form of data capture
TTL
transistor-transistor logic
U
UART
universal asynchronous receiver/transmitter—an integrated circuit that
converts parallel data to serial data (and vice versa), commonly used as a
computer bus to serial device interface for serial communication
UI
update interval
UISOURCE
update interval counter clock signal