Glossary
©
National Instruments Corporation
G-9
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 DAQ
boards in the noisy PC environment.
SCXIbus
The analog bus where SCXI analog signals are routed.
SER CLK
A serial clock signal used to synchronize digital data transfers over the SER
DAT IN and SER DAT OUT lines.
SER DAT IN
serial data input signal
SER DAT OUT
serial data out to cabled DAQ device
sensor
A device that responds to a physical stimulus (heat, light, sound, pressure,
motion, flow, and so on), and produces a corresponding electrical signal.
Primary characteristics of sensors are sensitivity, frequency range, and
linearity.
settling time
The time required for an amplifier, relays, or other circuits to reach a stable
mode of operation.
shunt
See
.
shunt calibration
The method of calibrating the gain of strain-gauge data acquisition channel
by placing a resistor of known value in parallel with a bridge element.
signal conditioning
The manipulation of signals to prepare them for digitizing.
Slot 0
The first slot in a VXI or SCXI system.
strain
The relative deformation of an object subjected to stress. Hence, strain is
dimensionless.
SYNC
synchronization pulse for scanning
system noise
A measure of the amount of noise seen by an analog circuit or an ADC
when the analog inputs are grounded.
