Programming instructions

Glossary
© National Instruments Corporation G-7 LabVIEW Data Acquisition Basics Manual
floating signal sources Signal sources with voltage signals that are not connected to an absolute
reference or system ground. Some common example of floating signal
sources are batteries, transformers, or thermocouples.
Also called
nonreferenced signal sources.
G
gain The amplification or attenuation of a signal.
GATE input pin A counter input pin that controls when counting in your application occurs.
grounded measurement
system
See
referenced single-ended measurement system.
grounded signal sources Signal sources with voltage signals that are referenced to a system
ground, such as the earth or a building ground.
Also called
referenced
signal sources.
group A collection of input or output channels or ports that you define. Groups
can contain analog input, analog output, digital input, digital output, or
counter/timer channels. A group can contain only one type of channel,
however. You use a task ID number to refer to a group after you create it.
You can define up to 16 groups at one time.
To erase a group, you pass an empty channel array and the group number
to the group configuration VI. You do not need to erase a group to change
its membership. If you reconfigure a group whose task is active, LabVIEW
clears the task and returns a warning. LabVIEW does not restart the task
after you reconfigure the group.
H
handle Pointer to a pointer to a block of memory; handles reference arrays and
strings. An array of strings is a handle to a block of memory containing
handles to strings.
handshaked digital I/O A type of digital acquisition/generation where a device or module accepts
or transfers data after a digital pulse has been received.
Also called
latched
digital I/O.
hardware triggering A form of triggering where you set the start time of an acquisition and
gather data at a known position in time relative to a trigger signal.