Glossary
NI USB-621x User Manual G-14 ni.com
single-ended outputA circuit whose output signal is present between one output terminal and
ground.
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).
synchronous 1. Hardware—A property of an event that is synchronized to a reference
clock.
2. Software—A property of a function that begins an operation and
returns only when the operation is complete. A synchronous process is,
therefore, locked and no other processes can run during this time.
T
task In NI-DAQmx, a collection of one or more channels, timing, and triggering
and other properties that apply to the task itself. Conceptu ally, a task
represents a measurement or generation you want to perform.
TC See terminal count.
terminal An object or region on a node through which data passes.
terminal count The highest value of a counter.
t
gh
Gate hold time.
t
gsu
Gate setup time.
t
gw
Gate pulse width.
Timebase The reference signals for controlling the basic accuracy of time or
frequency-based measurements. For instruments, timebase refers to the
accuracy of the internal clock.
t
out
Output delay time.
transducer A device that responds to a physical stimulu s (heat, light, sound, pressure,
motion, flow, and so on), and produces a corresponding electrical signal.
See also sensor.
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