Glossary
Getting Started with Your PCI/PXI-6810 SDA
G-14
© National Instruments Corporation
percentage of full scale. For example, a system has 12-bit resolution,
one part in 4,096 resolution, and 0.0244% full scale.
retry an acknowledge by a destination that signifies that the cycle did not
complete and should be repeated
ribbon cable a flat cable in which the conductors are side by side
rise time the difference in time between the 10% and 90% points of a system’s
step response
rms root mean square—the square root of the average value of the square of
the instantaneous signal amplitude; a measure of signal amplitude
ROM read-only memory
RTSI bus real-time system integration bus—the National Instruments timing bus
that connects instruments directly, by means of connectors on top of the
boards, for precise synchronization of functions
S
s seconds
S
samples
sample counter the clock that counts the output of the channel clock, in other words, the
number of samples taken. On boards with simultaneous sampling, this
counter counts the output of the scan clock and hence the number of
scans.
scan one or more analog or digital input samples. Typically, the number of
input samples in a scan is equal to the number of channels in the input
group. For example, one pulse from the scan clock produces one scan
which acquires one new sample from every analog input channel in the
group.
scan clock the clock controlling the time interval between scans. On boards with
interval scanning support (for example, the AT-MIO-16F-5), this clock
gates the channel clock on and off. On boards with simultaneous
sampling (for example, the EISA-A2000), this clock clocks the
track-and-hold circuitry.
