National Instruments VXI-MIO Series User Manual page 131

F
FIFO
floating signal sources
FREQ_OUT
ft
function
G
gain
gain accuracy
GND
GPCTR0_GATE
GPCTR1_GATE
GPCTR0_OUT
GPCTR1_OUT
GPCTR0_SOURCE
National Instruments Corporation
first-in-first-out memory buffer—The first data stored is the first
data sent to the acceptor. FIFOs are often used on DAQ devices to
temporarily store incoming or outgoing data until that data can be
retrieved or output. For example, an analog input FIFO stores the
results of A/D conversions until the data can be retrieved into
system memory, a process that requires the servicing of interrupts
and often the programming of the DMA controller. This process
can take several milliseconds in some cases. During this time,
data accumulates in the FIFO for future retrieval. With a larger
FIFO, longer latencies can be tolerated. In the case of analog
output, a FIFO permits faster update rates, because the waveform
data can be stored on the FIFO ahead of time. This again reduces
the effect of latencies associated with getting the data from system
memory to the DAQ device.
Signal sources with voltage signals that are not connected to an
absolute reference or system ground. Also called nonreferenced
signal sources. Some common example of floating signal sources
are batteries, transformers, or thermocouples.
frequency output signal
feet
A set of software instructions executed by a single line of code
that may have input and/or output parameters and returns a value
when executed.
The factor by which a signal is amplified, sometimes expressed in
decibels.
A measure of deviation of the gain of an amplifier from the ideal
gain.
ground signal or bit
general purpose counter 0 gate signal
general purpose counter 1 gate signal
general purpose counter 0 output signal
general purpose counter 1 output signal
general purpose counter 0 clock source signal
G-7
Glossary
VXI-MIO Series User Manual