Terminology - 1
IM 4H3B1-01E
TERMINOLOGY
TERMINOLOGY
allowable input voltage The maximum input voltage that can be applied to the input terminals
burnout Failure of a device due to excessive heat
common-mode rejection ratio The ability of an amplifier to cancel a common-mode voltage
common-mode voltage A voltage that appears equally and in phase from each signal conductor with
respect to ground. Also known as common-mode noise. Power noise induced
from a power transformer is a typical example of this noise (voltage)
dead band In static characteristics, the range through which an input signal can be varied
without initiating an observable change in output signal
DI Digital Input (contact & voltage level)
dielectric strength The potential gradient at which electric failure or breakdown occurs
EMI An abbreviation for Electromagnetic Interference. Impairment of a wanted
electromagnetic signal due to an electromagnetic disturbance
error Any discrepancy between a measured quantity, set-point, or rated value and the
ideal value of the measured signal
hysteresis An effect wherein a given value of a parameter may result in multiple values
input resistance Resistance measured at the input terminals of an instrument under operating
conditions
input source resistance Resistance of the measuring circuit outside the instrument
ISO An abbreviation for International Organization for Standardization
noise An unwanted disturbance superimposed upon an indicated or supplied value,
which obscures its information content
normal mode rejection ratio The ability of certain amplifiers to cancel a normal mode noise, usually
expressed in decibels
normal mode voltage An unwanted input (noise) voltage superimposed on the measurement voltage
reference junction That thermocouple junction which is at a known or reference temperature
reference junction compensation
A means of counteracting the effect of temperature variations of the reference
junction, when allowed to vary within specified limits
reflash Function to indicate repeating alarm occurences among a group of alarms sharing
the same output relay
resistance temperature detector A detector for measuring temperatures with a change in electrical resistance that
is a known function of temperature
resolution The minimum detectable change of some variables in a measurement system, or
a minimum change in supplied quantity that can be set
RS-422-A The EIA (Electronics Industries Association) approved standard, which
established the requirements for serial communications between computers
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