User's Manual

NI-DAQ FRM for PC Compatibles) G-12 © National Instruments Corporation
Glossary
SS simultaneous sampling—a property of a system in which each input or
output channel is digitized or updated at the same instant
S/s samples per second
STC system timing controller
switchless device devices that do not require dip switches or jumpers to configure resources
on the devices—also called Plug and Play devices
synchronous (1) hardware—a property of an event that is synchronized to a reference
clock (2) software—a property of a function that begins an operation and
returns only when the operation is complete
T
TC terminal count
T/H track-and-hold—a circuit that tracks an analog voltage and holds the value
on command
transfer rate the rate, measured in bytes/s, at which data is moved from source to
destination after software initialization and set up operations; the maximum
rate at which the hardware can operate
trigger any event that causes or starts some form of data capture
TTL transistor-transistor logic
U
UI update interval
unipolar a signal range that is always positive (for example, 0 to +10 V)
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