With a level of 0.5, range of 10mA ammeter on a circuit of electrical operation 10 times equal precision measurements, the measurement data are shown in the table below. Try to calculate the measureme

I=(9.55+9.56+9.50+9.53+9.60+9.40+9.57+9.62+9.59+9.56)/10=9.548

I=(I1+I2+I3+I4+I5+I6+I7+I8+I9+I10)/10<

Maximum absolute error of ammeter: 10A*0.5%=0.05A

Maximum absolute error of voltmeter: 250V*0.5%=1.25V

Maximum error of input power:

(220+1.25)*(9+0.05)-9*220=22.31

(220-) 1.25)*(9-0.05)-9*220= -22.19

See that the maximum error in input power is 22.31W

Equivalent precision measurement

In the whole measurement process, if all the factors (conditions) affecting and determining the magnitude of the error remain unchanged, for example, by the same measurements, with the same instrument, the same measurement method, under the same environmental conditions, the same measurement method, and the same measurement method. In the same environmental conditions, the same measurement of the same measurement is repeated several times the measurement method. Of course, in practice, it is extremely difficult to influence and determine the size of the error of all the factors (conditions) always remain unchanged, so in general can only be approximated as equal precision measurement.

Reference: Baidu Encyclopedia - Equal Precision Measurement

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