Measurement-computing WaveBook rev.3.0 Bedienungsanleitung PDF herunterladen (Seite 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).

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Measurement-computing WaveBook rev.3.0 Bedienungsanleitung Seite 174