Publication 1769-UM005A-EN-P
G-3
linearity error
– Any deviation of the converted input or actual output
from a straight line of values representing the ideal analog input. An
analog input is composed of a series of input values corresponding to
digital codes. For an ideal analog input, the values lie in a straight line
spaced by inputs corresponding to 1 LSB. Linearity is expressed in percent
full-scale input. See the variation from the straight line due to linearity
error (exaggerated) in the example below.
LSB
– Least significant bit. The LSB represents the smallest value within a
string of bits. For analog modules, 16-bit, two’s complement binary codes
are used in the I/O image. For analog inputs, the LSB is defined as the
rightmost bit of the 16-bit field (bit 0). The weight of the LSB value is
defined as the full-scale range divided by the resolution.
module scan time
– same as
module update time
module update time
– The time required for the module to sample and
convert the input signals of all enabled input channels and make the
resulting data values available to the processor.
multiplexer
– An switching system that allows several signals to share a
common A/D converter.
normal mode rejection
– (differential mode rejection) A logarithmic
measure, in dB, of a device’s ability to reject noise signals between or
among circuit signal conductors. The measurement does not apply to
noise signals between the equipment grounding conductor or signal
reference structure and the signal conductors.
number of significant bits
– The power of two that represents the total
number of completely different digital codes to which an analog signal
can be converted or from which it can be generated.
overall accuracy
– The worst-case deviation of the digital representation
of the input signal from the ideal over the full input range is the overall
accuracy. Overall accuracy is expressed in percent of full scale.
repeatability
– The closeness of agreement among repeated
measurements of the same variable under the same conditions.
Ideal Transfer
Actual Transfer
Function
Содержание Compact 1769-IR6
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