National Instruments DAQ M Series User Manual

Page 152

Advertising
background image

Glossary

NI 6236 User Manual

G-18

ni.com

trigger

1. Any event that causes or starts some form of data capture.

2. An external stimulus that initiates one or more instrument functions.

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.

t

sc

Source clock period.

t

sp

Source pulse width.

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

cm

Common-mode voltage.

V

g

Ground loop voltage.

V

IH

Volts, input high.

V

IL

Volts, input low.

V

in

Volts in.

V

m

Measured voltage.

V

OH

Volts, output high.

V

OL

Volts, output low.

Advertising