Glossary
X Series User Manual
G-8
ni.com
freq
u
ency
The n
u
mber of alternating signals that occ
u
r per
u
nit time.
ft
Feet.
f
u
nction
1. A b
u
ilt-in exec
u
tion element, comparable to an operator, f
u
nction, or
statement in a conventional lang
u
age.
2. A set of software instr
u
ctions exec
u
ted by a single line of code that may
have inp
u
t and/or o
u
tp
u
t parameters and ret
u
rns a val
u
e when exec
u
ted.
G
glitch
An
u
nwanted signal exc
u
rsion of short d
u
ration that is
u
s
u
ally
u
navoidable.
gro
u
nd
1. A pin.
2. An electrically ne
u
tral wire that has the same potential as the
s
u
rro
u
nding earth. Normally, a nonc
u
rrent-carrying circ
u
it intended for
safety.
3. A common reference point for an electrical system.
H
hardware triggering
A form of triggering where yo
u
set the start time of an acq
u
isition and
gather data at a known position in time relative to a trigger signal.
hysteresis
Lag between making a change and the effect of the change.
I
I/O
Inp
u
t/O
u
tp
u
t—The transfer of data to/from a comp
u
ter system involving
comm
u
nications channels, operator interface devices, and/or data
acq
u
isition and control interfaces.
impedance
1. The electrical characteristic of a circ
u
it expressed in ohms and/or
capacitance/ind
u
ctance.
2. Resistance.
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