National Instruments NI 4050 Manual De Usuario
Glossary
© National Instruments Corporation
G-7
P
PCI
Peripheral Component Interconnect—a high-performance expansion bus
architecture originally developed by Intel to replace ISA and EISA; it is
achieving widespread acceptance as a standard for PCs and workstations
and offers a theoretical maximum transfer rate of 132 Mbytes/s
architecture originally developed by Intel to replace ISA and EISA; it is
achieving widespread acceptance as a standard for PCs and workstations
and offers a theoretical maximum transfer rate of 132 Mbytes/s
peak value
the absolute maximum or minimum amplitude of a signal (AC + DC)
PXI
PCI eXtensions for Instrumentation. PXI is an open specification that
builds off the CompactPCI specification by adding
instrumentation-specific features.
builds off the CompactPCI specification by adding
instrumentation-specific features.
R
R
resistor
RAM
random-access memory
range error
an error in accuracy that is determined by the input range that is selected.
The range error is independent of the value of the signal being measured.
The range error is independent of the value of the signal being measured.
reading error
an error in accuracy that is determined by the input range, as well as the
value being measured
value being measured
reading rate
the rate at which a new measurement is taken. In addition to the
measurement speed, the selection of the reading rate affects the filtering,
and thus the noise level, of measurements.
measurement speed, the selection of the reading rate affects the filtering,
and thus the noise level, of measurements.
resolution
the smallest signal increment that can be detected by a measurement
system. Resolution can be expressed in bits or in digits. The number of bits
in a system is roughly equal to 3.3 times the number of digits.
system. Resolution can be expressed in bits or in digits. The number of bits
in a system is roughly equal to 3.3 times the number of digits.
rms
root mean square—a measure of signal amplitude; the square root of the
average value of the square of the instantaneous signal amplitude
average value of the square of the instantaneous signal amplitude
ROM
read-only memory
R
sense
the sense resistor. The voltage across this resistor is measured and
converted to a current.
converted to a current.