Glossary
DAQMeter DAQCard-4050 User Manual
G-2
©
National Instruments Corporation
A
A
amperes
AC
alternating current
AC coupled
the passing of a signal through a filter network that removes the DC
component of the signal
A/D
analog-to-digital
ADC
analog-to-digital converter—an electronic device, often an integrated
circuit, that converts an analog voltage to a digital number
ADC resolution
the resolution of the ADC, which is measured in bits. An ADC with
16 bits has a higher resolution, and thus a higher degree of accuracy,
than a 12-bit ADC.
amplification
a type of signal conditioning that improves accuracy in the resulting
digitized signal and reduces noise
amplitude flatness
a measure of how close to constant the gain of a circuit remains over a
range of frequencies
aperture time
the period of time over which a measurement is averaged; also called
the number of powerline cycles
attenuate
to reduce in magnitude
B
b
bit—one binary digit, either 0 or 1
B
byte—eight related bits of data, an eight-bit binary number. Also used
to denote the amount of memory required to store one byte of data.
bus
the group of conductors that interconnect individual circuitry in a
computer. Typically, a bus is the expansion vehicle to which I/O or
other devices are connected. Examples of PC buses are the PCI bus, AT
bus, and EISA bus.
