User manual

Glossary
NI 6034E/6035E/6036E User Manual G-12 ni.com
TTL transistor-transistor logic—a digital circuit composed of bipolar transistors
wired in a certain manner
two’s complement given a number x expressedinbase2withn digits to the left of the radix
point, the (base 2) number 2n - x
U
UI update interval
UISOURCE update interval counter clock signal
update 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 rate the number of output updates per second
V
V volts
V
cc
positive supply voltage
VDC volts direct current
VI 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
V
IH
volts, input high
V
IL
volts, input low
V
in
volts in
V
m
measured voltage
V
OH
volts, output high
UM.book Page 12 Monday, May 14, 2001 10:32 AM