The answer depends on how large the object is, what instrument is used to measure it and the skill level and attitude of the person doing the measurement.
Improper calibration of the measuring instrument. If the measuring instrument is not at zero prior to measuring the object you will get a systematic error which, is a value either always higher or always lower then the actual value of the object.
I'm assuming you're measuring somethings' displacement along a scale. There are three simple ways of reducing parallax error in that case: 1: Attach a straight object (like a ruler or straightened paperclip) to the thing you're measuring the displacement of, it should stick out of the object perpendicularly to the scale you're measuring the displacement on. 2: Make sure that object is as close to your scale as possible, but not touching. 3: Put your eyes level with the object, and as close to it as you safely can.
It is necessary because measuring tools help you measure the length of an object accurately.
The standard error.
The relative error measurements indicates the quality of a measurement relative to the quantity of the object being measured. To derive the relative error, divide the absolute error by the value of the object being measured.
Improper calibration of the measuring instrument. If the measuring instrument is not at zero prior to measuring the object you will get a systematic error which, is a value either always higher or always lower then the actual value of the object.
in optical instruments,while measuring the lenght,the object and the image must overlap,if not it would show parallax error.
I'm assuming you're measuring somethings' displacement along a scale. There are three simple ways of reducing parallax error in that case: 1: Attach a straight object (like a ruler or straightened paperclip) to the thing you're measuring the displacement of, it should stick out of the object perpendicularly to the scale you're measuring the displacement on. 2: Make sure that object is as close to your scale as possible, but not touching. 3: Put your eyes level with the object, and as close to it as you safely can.
:parallax error occurs when the line of sight or measure is not at right angles ( perpendicular ) to the objects being measured. Any distance between the object and the measuring reference ( for example a rule ) will cause a misreading. This error will increase as the distance between the object and the reference increases.
It is necessary because measuring tools help you measure the length of an object accurately.
by measuring the object
RATIO ERROR The secondary current is less than the expected value. The secondary is less in magnitude. This diffence is known as ratio error. PHASE ERROR The angle between the expected and actual secondary current is known as phase error.
Measuring how heavy an object is compared to another object.
[object Object]
Zero error is necessary for measuring instruments for measuring accurate results because it helps to check that the instrument which we are using is whether correct or wrong
by measuring the object
Intrinsic error.