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Glossary
trigger
1. Any event that causes or starts some form of data capture.
2. An external stimulus that initiates one or more instrument functions.
t
Source clock period.
sc
t
Source pulse width.
sp
TTL
Transistor-Transistor Logic—A digital circuit composed of bipolar
transistors wired in a certain manner. A typical medium-speed digital
technology. Nominal TTL logic levels are 0 and 5 V.
U
USB
Universal Serial Bus—A 480 Mbit/s serial bus with up to 12-Mbps
bandwidth for connecting computers to keyboards, printers, and other
peripheral devices. USB 2.0 retains compatibility with the original USB
specification.
V
V
Volts.
V
Common-mode voltage.
cm
V
Ground loop voltage.
g
V
Volts, input high.
IH
V
Volts, input low.
IL
V
Volts in.
in
V
Measured voltage.
m
V
Volts, output high.
OH
V
Volts, output low.
OL
V
Volts out.
out
NI 6238/6239 User Manual
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Trigger stimuli include a front panel button, an external input voltage
pulse, or a bus trigger command. The trigger may also be derived from
attributes of the actual signal to be acquired, such as the level and slope
of the signal.
G-18
ni.com
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