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Glossary
© National Instruments Corporation
G-15
Getting Started with Your PCI/PXI-6810 SDA
scan rate
the number of scans per second. For example, a scan rate of 10 Hz
means sampling each channel 10 times per second.
SCXI
Signal Conditioning eXtensions for Instrumentation—the National
Instruments product line for conditioning low-level signals within an
external chassis near sensors so only high-level signals are sent to
instruments in the noisy PC environment
SDA
Serial Data Analyzer
SDK
software development kit
settling time
the amount of time required for a voltage to reach its final value within
specified limits
shared memory
See dual-access memory
signal conditioning
the manipulation of signals to prepare them for digitizing
signal divider
performing frequency division on an external signal
SIMM
single in-line memory module
SMB
a type of miniature coaxial signal connector
SNR
signal-to-noise ratio—the ratio of the overall rms signal level to the rms
noise level, expressed in decibels
software trigger
a programmed event that triggers an event such as data acquisition
software triggering
a method of triggering in which you simulate an analog trigger using
software. Also called conditional retrieval.
source impedance
a parameter of signal sources that reflects current-driving ability of
voltage sources (lower is better) and the voltage-driving ability of
current sources (higher is better)
SOURCE input pin
an counter input pin where the counter counts the signal transitions
S/s
samples per second—used to express the rate at which an instrument
samples an analog signal
statically configured
a device whose logical address cannot be set through software; that is,
device
it is not dynamically configurable