Glossary
SCXI-1502 User Manual
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RMA
Return Material Authorization
rms
Root mean square—the square root of the average value of the square of the
instantaneous signal amplitude; a measure of signal amplitude.
RSVD
Reserved bit, pin, or signal.
S
s
Seconds.
S
Samples.
sample
An instantaneous measurement of a signal, normally using an
analog-to-digital converter in an E/M Series DAQ device.
sample rate
The number of samples a system takes over a given time period, usually
expressed in samples per second.
scan
One or more analog samples taken at the same time, or nearly the same
time. Typically, the number of input samples in a scan is equal to the
number of channels in the input group. For example, one scan acquires one
new sample from every analog input channel in the group.
SCANCLK
Scan clock signal used to increment to the next channel after each
E/M Series DAQ device analog-to-digital conversion.
SCXI
Signal Conditioning eXtensions for Instrumentation—the NI product line
for conditioning low-level signals within an external chassis near sensors
so only high-level signals are sent to DAQ devices in the noisy PC
environment.
SCXIbus
Located in the rear of an SCXI chassis, the SCXIbus is the backplane that
connects modules in the same chassis to each other.
sensor
A device that converts a physical phenomenon into an electrical signal.
SER CLK
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.