Instrumentation and calibration

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Accuracy: the closeness with which the reading of a measuring istrumento approaches the true value of the measured variable
Loyalty: a measure of the degree to which successive measurements differ from each other without need for said real value is the
Repeatability: The ability to playback measures the output signal indicated by the instrument to measure repeatedly identical values of the variable under the same conditions of service and in the same sense of variation, covering the whole field
Conditions of repetition: the same measurement procedure, the same operator, same istrumento measurement under the same conditions, same place, mass measurements in a short period of time
Playing: acurdo between the results of a set of measures on the same measurand, carried out under different measurement conditions
eg measuring principle, measuring method, person doing the reading and reference pattern
Calibration: to define the correction factor for multiplying the value of reading by the correction factor for the correct value the measurement d match the pattern value
Error: expresses the difference between the measured quantity and instrumental reading
Tolerance of a variable: difference between maximum and minimum values that can take a measured variable to make it consistent with the specifications
Sensitivity: expresses that both output switches on the input DECEA this is high and constant as possible l range measurement d, s expressed quantitatively
Resolution: expresses the ability to discriminate between values devido a graduation of the instrument, we often speak of the number of digits for digital numerical indicators and% of scale for needle instruments
Random error: the result of a measurement minus the measurement that would result from an infinite number of measurements to measure the same quantities carried out under repeatability conditions d
Systematic failure: the one that the measurements are performed under the same conditions always has the same value
Uncertainty is the maximum positive or negative value can cause the error between the true value or the value of ma magnitude being measured DECEA
Measurement Class: used to compare different sensors with each other, all sensors belonging to the same class have a measurement error not exceeding a particular asset class called index
Range: expressed seperior lower limits of the ranges
Working range of operation: improving the resolution but not necessarily the sensitivity
Dead band: it is how great must be the change in species sensed so that the instrument responds
Response time: the measurement of any variable of any process may involve a delay
Hysteresis: The difference maxima observed at the levels indicated by the index or pen for the same instrument instrument
Transfer Function: An instrument can be represented by a mathematical model input / output transfer function called
Measuring range: spectrum or set of variable values as they are within the upper and lower limits of measurement capability
Rangleabilidad: is the ratio between the value of the top and bottom as an instrument
Span or reachesIt is the algebraic difference between the upper and lower measurement range





Accuracy: is tolerance or Transmit measurement instrument and defines the limits of error committed when the instrument is used in normal
Measurement range with elevation of 0: is this field so far as the value of the variable or measured signal is greater than the lower value of the field
Measurement range with precision of 0: when the value 0 of the variable or measured signal is less than the lower value of the field
Elevation of 0: is the amount by which the value 0 of the variable exceeds the lower value of the field.
Its precision of 0: is the amount by which the lower value of the field exceeds the value or the variation
Drifting: is a variation in the output signal that occurs in a given time period d are held constant while measuring and variabkes all environmental conditions are considered sulen drift of 0
Reliability: A measure of the probability that an instrument contains behaviors within the specified limits of error over a given time and under specific conditions
Noise: perturvacion electrical or signal any unwanted accidental amending Transmicion
Stability: ability of an instrument to maintain its performance over its useful life and specified storage
T ° of use: t º field in which the instrument expected to work within specific limits of error
Service life: specified minimum time during which apply the characteristics of continuous and intermittent instrument without submitting changes beyond specified tolerances
Inaccuracy: as the difference between the average of the measurements and the actual value of the measured quantity and also the indication of how close is a measure of the actual value of the actual amount.
Measurement error: it is the algebraic difference between the value read or transmitted by the instrument and the actual value of the measured variable
Settings zero is a linear displacement range, the adjustment is to shift the linear range to obtain the correct zero reading
Angular settings: the angular error presents an accurate reading at any arbitrary point of the scale, and an error that increases in proportion to the distance of this point.
No indication or blind instruments are those that have no visible indication of the variable
With a display: have an index and a scale in which you can read the value of the variable
Control on-off: it is the most elementary is to activate the command when the variable is below the set point and off when the variable is above the set point
(advantages) poko wear contacts electromecanic
Set point: is the default value and deceado value of the variable or value which the control should maintain pv
Erros: The difference between the value of the process variable and set point
Proportional band: the band is located below the set point at which the output varies proportionally to the error, reducing The closer to set point

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