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Glossary
G-6
ni.com
differential inp
u
t
An inp
u
t circ
u
it that actively responds to the difference between two
terminals, rather than the difference between one terminal and gro
u
nd.
Often associated with balanced inp
u
t circ
u
itry, b
u
t also may be
u
sed with
an
u
nbalanced so
u
rce.
digital I/O
The capability of an instr
u
ment to generate and acq
u
ire digital signals.
Static digital I/O refers to signals where the val
u
es are set and held, or
rarely change. Dynamic digital I/O refers to digital systems where the
signals are contin
u
o
u
sly changing, often at m
u
lti-MHz clock rates.
digital signal
A representation of information by a set of discrete val
u
es according to a
prescribed law. These val
u
es are represented by n
u
mbers.
digital trigger
A TTL level signal having two discrete levels—A high and a low level.
DIO
Digital inp
u
t/o
u
tp
u
t.
driver
Software
u
niq
u
e to the device or type of device, and incl
u
des the set of
commands the device accepts.
E
edge detection
A techniq
u
e that locates an edge of an analog signal, s
u
ch as the edge of a
sq
u
are wave.
EEPROM
Electrically Erasable Programmable Read-Only Memory—ROM that can
be erased with an electrical signal and reprogrammed. Some SCXI mod
u
les
contain an EEPROM to store meas
u
rement-correction coefficients.
encoder
A device that converts linear or rotary displacement into digital or p
u
lse
signals. The most pop
u
lar type of encoder is the optical encoder, which
u
ses
a rotating disk with alternating opaq
u
e areas, a light so
u
rce, and a
photodetector.
external trigger
A voltage p
u
lse from an external so
u
rce that ca
u
ses a DAQ operation to
begin.