Electrical Measurements and the Calculation of the Errors Involved, Part 1Macdonald, 1950 - Electric measurements |
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Page 14
... scale , that is , a scale having the same distance between consecutive divisions throughout , the relative error varies inversely with the indication of the instrument . Say that we can distinguish 1 - α of a division , and let each ...
... scale , that is , a scale having the same distance between consecutive divisions throughout , the relative error varies inversely with the indication of the instrument . Say that we can distinguish 1 - α of a division , and let each ...
Page 15
... scale . The question then arises in which part of the scale is the reading error smallest ? c Let z be the variable distance in mm . between consecutive divisions on the scale , and let the distance which can be distinguished be c mm ...
... scale . The question then arises in which part of the scale is the reading error smallest ? c Let z be the variable distance in mm . between consecutive divisions on the scale , and let the distance which can be distinguished be c mm ...
Page 26
... scale divisions , and uniform scale , shows 10 amps on division 100. The voltmeter of 150 scale divisions , and uniform scale , shows 120 volts on division 120 . The resistance of the voltmeter is 100 ohms per volt . The scales of the ...
... scale divisions , and uniform scale , shows 10 amps on division 100. The voltmeter of 150 scale divisions , and uniform scale , shows 120 volts on division 120 . The resistance of the voltmeter is 100 ohms per volt . The scales of the ...
Contents
ERRORS IN MEASUREMENTS | 9 |
Mar 50 Blackwell 252 Enge | 16 |
MEASUREMENT OF D C RESISTANCE | 24 |
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a₁ a₂ ammeter amps arrangement Assuming balance becomes bridge cable calculated calibration cell charge checked circuit closed coil condenser connected Consider constant constructional error corresponding damping deflection determination dials difference discharge division E₁ equal Example field flux fluxmeter follows galvanometer given giving greater i₁ increase indication inductance insulation known limits logarithmic differential magnetic maximum means measured meter method moving noted ohms period pointer position potentiometer PRACTICAL precision produce R₁ R₂ ratio reading error relative error resistance result S₁ scale sensitivity setting shown in fig shunt sliding smaller standard standardising substandard suitable supply t₁ taken temperature torque turns V₁ varied voltage voltmeter volts wire write zero αι Φο