National Instruments NI 447 Series User Manual page 74

t
p
t
reset
TRIG1 (EXT_TRIG)
trigger
tri-state
TTL
TTL-compatible
two's complement
format
U
unbalanced
differential input
undersampling
V
V
V
CC
VDC
© National Instruments Corporation
the interval between pulses in a pulse train
the length of the reset period
trigger 1 signal
any event that causes or starts some form of data capture
logic circuitry designed to have three possible outputs—0, 1, and hi-Z.
The hi-Z (high impedance) state effectively pulls the output out of its
circuit, and can be used to simplify bus communication by wire-ANDing
tri-state inputs.
transistor-transistor logic
operating in a nominal range of 0 to 5 VDC, with a signal below 1 V a logic
low, and a signal above 2.4 V a logic high
a system for digitally encoding sound that stores the amplitude values as a
signed number, with silence represented by a sample with a value of 0. For
example, with 8-bit sound samples, two's complement values would range
from –128 to 127, with 0 meaning silence. See also
an analog input channel consisting of two terminals, with different input
impedances, whose difference is measured. In the case of the NI 447X, one
terminal is referenced to ground through a resistor. See also
input.
sampling at a rate lower than the Nyquist frequency—can cause aliasing
volts
collector common voltage—power supply voltage
volts direct current
G-13
Glossary
offset-binary format.
differential
NI 447X User Manual