engineering measurements

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Micah Tajanlangit

問題数 28 • 2024/09/26

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Study of engineering measurements, measuring physical quantities and the instrument or apparatus used in measurement

physical measurement

The Only 3 quantities considered as fundamental quantities

length,mass,time

basis of all measurement of the other quantities

fundamental quantities

combination of two-three fundamental quantities

derived quantities

Which one is NOT the use of the metric system?

foot

english systems uses

foot,pound,second

process of ascertaining the magnitude or condition of a physical quantity through comparison with a given accepted standard

measurement

apparatus for ascertaining and exhibiting in some suitable manner

measuring instrument

the pointer, light spot, liquid surface and etc., value of the measured quantity, the point of balance of a null-point instrument is indicated

index

indicating instrument, array of marks, together asscociated figuring, with relatiin to which the index is observed

scale

the process of setting out the scale with the series of marks

graduation

process of determining characteristics relation between the value of the physical quantities

calibration

measurement of physical quatities are performed in two methods:

direct and indirect comparison

the smallest change in the quantity measured which produces a perceptible movement of the index

sensitiveness

the reproducibility of the readings of an instrument when a series of test is carried out in a short interval of time under fixed condition of use.

repeatability

the reproducibility of mean readings of an instrument when tested under defined condition of use, repeated on different occasions separated by intervals of time which are long compared to the time of taking a reading

stability

a general term describing the degree of closeness with which the indications of an instrument approach the true values of the quantities

accuracy

the difference obtained by subtracting the true value of the quantity measured from the indicated value, due regard being paid to the sign of each

error

the amount which should be added to indicated value, due regard being paid to sign, to obtain the true value of the quantity measured

correction

the optical illusion situation often overlooked by people in reading of index positions relative to the scale

parallax

a slight degree of "play" in the movementof the instrument which constitute an error due to the instrument itself

backlash

the term used to described for the pressure between the face of the measuring instrument contact and the surface to which the contact is applied

feel

a device incorporated in the design of a measuring instrument for the purpose of insuring that the measuring pressure shall remain constant

fiducial indicator

is the smallest amount of the quantity being measured which the instrument can give or detect. This is equivalent to the smallest increment in the graduation of the measuring instrument

resolution

the suscriptibility of a measuring device to having its indication converted to a meaningful number. Such as the vernier on a micrometer or caliper

readability

a device that respond to a phenomenon of producing a signal which is related to two or more variables of the phenomenon

transducer

the pick or detecting elements that respond to the magnitude and changes in the measured value

sensor

the part of the measuring system which displays output signal or information shown in the form of indicators, digital display, or recorders

readout