Uncertainty In Measurement Technique - Effects Of Systematic Error
What is uncertainty in measurement techinque in physics study.
Objectives: 1. Use techniques for the measurement of length, volume, angle, mass, time, temperature and electrical quantities, all to appropriate ranges of magnitude;
2. Understand and explain the effects of systematic error please help to summarize or give notes
Measurement uncertainty is a quantitative indication of the quality of measurement results, without which they could not be compared between themselves, with specified reference values or to a standard.
To get useful IB Physics Notes visit here.
Systematic errors in experimental observations usually come from the measuring instruments. They may occur because of below reasons:
1. There is something wrong with the instrument (machine) or its data handling system (DHS), or
2. Because the instrument (machine) is wrongly used by the experimenter.
Two types of systematic error can occur with instruments having a linear response:
1. Offset or zero setting error in which the instrument does not read zero when the quantity to be measured is zero.
2. Multiplier or scale factor error in which the instrument consistently reads changes in the quantity to be measured greater or less than the actual changes.
Examples of systematic errors caused by the wrong use of instruments are:
1. Errors in measurements of temperature due to poor thermal contact between the thermometer and the substance whose temperature is to be found,
2. Errors in measurements of solar radiation because trees or buildings shade the radiometer.
The accuracy of a measurement is how close the measurement is to the true value of the quantity being measured.
The accuracy of measurements is often reduced by systematic errors, which are difficult to detect even for experienced research workers.
asked Jun 04 3:59:32 PM