Basic Electrical Measurements |
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Page 16
... Span is the extent of units the instrument is able to measure , that is , the difference between the highest and lowest measured values . For the instrument in Figure 1.5 , the span is 50 kPa ( 50 - 0 = 50 ) ; for the other instrument ...
... Span is the extent of units the instrument is able to measure , that is , the difference between the highest and lowest measured values . For the instrument in Figure 1.5 , the span is 50 kPa ( 50 - 0 = 50 ) ; for the other instrument ...
Page 19
... span adjust- ment . There is a problem , though , if there is a serious noncorrectable linearity error present . If this is the case , the span and zero adjust- ments can be made in such a way that there will be no error at 0 % and 100 ...
... span adjust- ment . There is a problem , though , if there is a serious noncorrectable linearity error present . If this is the case , the span and zero adjust- ments can be made in such a way that there will be no error at 0 % and 100 ...
Page 20
... span ) , the span is correctly adjusted . If it is different , adjust the span until a 50 % input change results in a 50 % output change . Note : The reason for not adjusting the span using 0 % and 100 % readings is that because of a ...
... span ) , the span is correctly adjusted . If it is different , adjust the span until a 50 % input change results in a 50 % output change . Note : The reason for not adjusting the span using 0 % and 100 % readings is that because of a ...
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ac bridges accuracy and precision accurate adjustable resistor ammeter average balanced calibration capacitance components construction current going decade box deviation plot digital meter diode electrical equation Example full-scale deflection full-wave germanium given Half-wave hysteresis input impedance linear loading effect loading error loop low resistances main resistor measured values measuring instrument ment meter movement meter resistance meter sensitivity midscale reading midscale resistance multiturn null detector number of significant Ohm's law ohms output impedance parallel ohmmeter PMMC meter PMMC movement pointer position potentiometer potentiometric circuits precision problem R₁ R₂ ranging resistor ratio reactance readability readout rectifier reference accuracy resis rotating scientific notation series ohmmeter shown in Figure shows shunt significant digits source output impedance span supply voltage switch tance tion true voltage units V₁ variable resistor Vave volt voltage drop voltage measured voltmeter Vrms Weston cell wiper ΚΩ