Glossary
©
National Instruments Corporation
G-13
SC-2311 User Manual
RTI
referred to input
RTSI bus
real-time system integration bus—the National Instruments timing bus that
connects DAQ devices directly, by means of connectors on top of the
devices, for precise synchronization of functions
S
s
seconds
S
samples
S/H
sample-and-hold—a circuit that acquires and stores an analog voltage on a
capacitor for a short period of time
S/s
samples per second—used to express the rate at which a DAQ device
samples an analog signal
sample counter
the clock that counts the output of the channel clock, in other words, the
number of samples taken. On devices 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 devices with
interval scanning support (for example, the PCI-6052E), this clock gates
the channel clock on and off. On devices with simultaneous sampling (for
example, the PCI-6110E), this clock clocks the track-and-hold circuitry.
scan rate
the number of scans per second. For example, a scan rate of 10 Hz means
sampling each channel 10 times per second.
SCANCLK
scan clock signal
SE
single-ended—a term used to describe an analog input that is measured
with respect to a common ground
self-calibrating
a property of a DAQ device that has an extremely stable onboard reference
and calibrates its own A/D and D/A circuits without manual adjustments by
the user
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