National Instruments DAQPad-6508 User Manual page 85

Glossary
system RAM
system noise
T
TC
T/H
Theorem
throughput rate
top-level VI
transfer rate
TRIG
trigger
TTL
U
UART
UI
UISOURCE
DAQPad-6507/6508 User Manual
RAM installed on a personal computer and used by the operating system,
as contrasted with onboard RAM
a measure of the amount of noise seen by an analog circuit or an ADC when
the analog inputs are grounded
terminal count
track-and-hold—a circuit that tracks an analog voltage and holds the value
on command
signal contains no frequency components higher than half the frequency at
which it is sampled, then the original signal can be recovered without
distortion
the data, measured in bytes/s, for a given continuous operation, calculated
to include software overhead. Throughput Rate = Transfer Rate Software
Overhead Factor.
VI at the top of the VI hierarchy. This term is used to distinguish the VI
from its subVIs.
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
trigger signal
any event that causes or starts some form of data capture
transistor-transistor logic
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
update interval
update interval counter clock signal
G-20 © National Instruments Corporation