Rockwell Automation 1790P-T4T0 CompactBlock LDX I/O Thermocouple Modules - Manual (Page 101)

Publication 1790-UM003A-EN-P
G-3
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.
resolution – The smallest detectable change in a measurement, typically
expressed in engineering units (e.g. 1°C) or as a number of bits. For
example a 12-bit system has 4096 possible output states. It can therefore
measure 1 part in 4096.
sampling time – The time required by the A/D converter to sample an
input channel.
step response time – The time required for the channel data word signal
to reach a specified percentage of its expected final value, given a
full-scale step change in the input signal.
thermocouple – A temperature sensing device consisting of a pair of
dissimilar conductors welded or fused together at one end to form a
measuring junction. The free ends are available for connection to the
reference (cold) junction. A temperature difference between the junctions
must exist for the device to function.
update time – see “module update time”