United Electronic Industries PD2-MF, User Manual

Page: 144 / 152

Appendix E: Glossary
134
SE
Single-Ended: A term used to describe
an analog input that is measured with
respect to a common ground.
Scan
Set of the channels, or data point, to
be acquired at the same time.
Self-Calibrating
DAQ board that calibrates its own A/D
and D/A circuits with and external
reference source.
Sensor
A device that responds to a physical
stimulus (heat, light, sound, pressure,
motion, flow, and so on), and
produces a corresponding electrical
signal.
S/H
Sample-and-Hold: A circuit that
acquires and stores an analog voltage
on a capacitor for a short period of
time.
SNR
Signal-to-Noise Ratio
:
The ratio of the
overall rms signal level to the rms noise
level, expressed in dB.
Software Trigger A programmed event that triggers an
event such as data acquisition.
SPDT
Single-Pole Double Throw: A property
of a switch in which one terminal can
be connected to one of two other
terminals.
SSH
Simultaneous Sampling and Hold: A
property of a system in which each
input or output channel is digitized or
updated at the same instant.
S/s
Samples per second; used to express
the rate at which a DAQ board samples
an analog signal.
Strain Gauge
A sensor whose resistance is a function
of the applied force.