Glossary
G-8
ni.com
G
glitch
An
u
nwanted signal exc
u
rsion of short d
u
ration that is
u
s
u
ally
u
navoidable.
GND
See
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.
Hz
1. Hertz—The SI
u
nit for meas
u
rement of freq
u
ency. One hertz (Hz)
eq
u
als one cycle per second.
2. The n
u
mber of scans read or
u
pdates written per second.
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.
in.
Inch or inches.
instr
u
ment driver
A set of high-level software f
u
nctions that controls a specific GPIB, VXI,
or RS232 programmable instr
u
ment or a specific pl
u
g-in DAQ device.
Instr
u
ment drivers are available in several forms, ranging from a f
u
nction
callable lang
u
age to a virt
u
al instr
u
ment (VI) in LabVIEW.
