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The water quality detector needs to use a variety of measurement methods to complete the experiment. Due to the fact that the measured value-form cannot be represented by a finite number of digits, coupled with the lack of cognitive ability and the limitation of the technological level, the measured value is not completely consistent with its true value. The expression of this contradiction in the value is wrong. Any measurement results have errors, and errors exist in all measurement processes. The so-called true value refers to the objective value or actual value reflected by a certain number of effects in a certain time, a certain position, or a state.
Analysis of Causes of Errors in Water Quality Detector
According to the nature and cause of the error, errors can be divided into systematic errors, random errors, and negligent errors.
1. System error, also known as measurable error, constant error or deviation error, refers to the difference between the overall average value of the measured value and the true value due to the action of certain constant factors during the measurement process. Under certain measurement conditions, the system error will appear repeatedly, that is, the size and direction of the error will be almost the same during repeated measurement. Therefore, increasing the number of measurements cannot reduce the system error.
2. Random error, also known as accidental error or unmeasurable error, is the result of various random factors in the measurement process.
Random errors are caused by many uncontrollable or uncontrollable factors such as fluctuations in ambient temperature, small fluctuations in power supply voltage, instrument noise, small differences, and inconsistencies in the analyst's judgment ability and operating technology. Therefore, random errors can be regarded as the superposition of errors caused by a large number of random factors.
3. Gross error is also called gross error. These errors have an obvious distorting effect on the measurement results. They are caused by improper errors such as unclean utensils, incorrect reagent additions, misuse of samples, loss of sample quality during operation, abnormal detection of water quality testing equipment, errors in readings, records, and calculations during the measurement process. Caused. There are no definite rules for negligence.
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