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Glossary
trigger
TTL
U
unipolar
update
UPDATE*
update rate
V
V
V
DC
VI
V
IH
V
IL
V
in
V
OH
V
OL
V
ref
PCI-4451/4452 User Manual
any event that causes or starts some form of data capture
transistor-transistor logic
a signal range that is always positive (for example, 0 to +10 V)
the output equivalent of a scan. One or more analog or digital output
samples. Typically, the number of output samples in an update is equal to
the number of channels in the output group. For example, one pulse from
the update clock produces one update which sends one new sample to every
analog output channel in the group.
update signal
the number of output updates per second
volts
volts direct current
virtual instrument—(1) a combination of hardware and/or software
elements, typically used with a PC, that has the functionality of a classic
stand-alone instrument (2) a LabVIEW software module (VI), which
consists of a front panel user interface and a block diagram program
volts, input high
volts, input low
volts in
volts, output high
volts, output low
reference voltage
G-18
© National Instruments Corporation
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