Measurement Computing WaveBook rev.3.0 - Manual (Page 174)

B-2 Appendix B, 6-21-99 WaveBook User’s Manual
Linearization Some transducers produce a voltage in linear proportion to the condition measured. Other
transducers (e.g., thermocouples) have a nonlinear response. To convert nonlinear signals
into accurate readings requires software to calibrate several points in the range used and
then interpolate values between these points.
Multiplexer (MUX) A device that selects a signal from among several signals and outputs it on a single channel.
Sample (reading) The value of a signal observed on a channel at an instant in time. When triggered, the ADC
reads the channel and converts the sampled value into a digital representation.
Scan A series of measurements across a pre-selected sequence of channels.
Sequencer Defines and controls the state of the measurement system for each step of a scan.
Simultaneous
Sample-and-Hold
An operation that captures samples from multiple channels at the same instant in time. The
result is elimination of time skew between measurement of individual channels.
Single-ended mode Measurement of a voltage between a signal line and some reference that may be shared with
other channels. (Also see differential mode).
Trigger An event to start a scan or mark an instant during an acquisition. A trigger can be a TTL signal,
a specified signal level, a button manually or mechanically engaged, or a software command.
TTL Transistor-Transistor Logic (TTL) typically used to communicate logic signals where a logical 0
is defined by a voltage level of <0.8V and logical 1 is defined as 2.4-5V.
Unipolar A range of analog signals between zero and some positive value (eg, 0 to 10 V).