Glossary
PCI-4451/4452/4453/4454 User Manual
G-8
www.ni.com
GPCTR0_SOURCE
general-purpose counter timer 0 clock source signal
GPCTR1_GATE
general-purpose counter timer 1 gate signal
GPCTR1_OUT
general-purpose counter timer 1 output signal
GPCTR1_SOURCE
general-purpose counter timer 1 clock source signal
grounded measurement
system
See SE.
H
h
hour
hardware
the physical components of a computer system, such as the circuit boards,
plug-in boards, chassis, enclosures, peripherals, and cables
hardware triggering
a form of triggering where you set the start time of an acquisition and gather
data at a known position in time relative to a trigger signal
high-impedance
in logic circuits designed to have three possible states—0, 1, and hi-Z—the
hi-Z (high impedance) state effectively removes the output from its circuit,
and can be used to simplify bus communication by wire-ANDing tri-state
inputs
Hz
hertz—cycles per second. Specifically refers to the repetition frequency of
a waveform.
I
IC
integrated circuit
IMD
intermodulation distortion—the ratio, in dB, of the total rms signal level of
harmonic sum and difference distortion products, to the overall rms signal
level. The test signal is two sine waves added together according to the
following standards:
CCIF—A 14 kHz sine wave and a 15 kHz sine wave added in a
1:1 amplitude ratio.
in.
inches
