Analysis on the Causes of Errors of 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, systematic errors will appear repeatedly, that is, the magnitude and direction of the errors are almost the same when repeated measurements. Therefore, increasing the number of measurements cannot reduce system errors.
(2) Random error, also known as accidental error or unmeasured 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 due to improper errors such as unclean utensils, incorrect reagent addition, sample misuse, sample quality loss 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.