Basic Electrical Measurements |
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Page 91
Steven Geczy. ( c ) Subtract equation 3 from equation 2 . -R1 + 999R2 + 999R3 + 999R1 = 100 - + R1 + R2 - 4999R3 - 4999R4 = -100 - 1000R2 4000R34000R4 = 0 Substitute the known values for R3 and R4 . 1000R 2 = 4000 × 0.0101 + 4000 X ...
Steven Geczy. ( c ) Subtract equation 3 from equation 2 . -R1 + 999R2 + 999R3 + 999R1 = 100 - + R1 + R2 - 4999R3 - 4999R4 = -100 - 1000R2 4000R34000R4 = 0 Substitute the known values for R3 and R4 . 1000R 2 = 4000 × 0.0101 + 4000 X ...
Page 103
... equation given above : Rx = ( I in the equation is in amperes . ) 1 I - 1000 If a scale is to be constructed showing the resistance at every 10 % reading ( 0 , 0.1 , 0.2 mA , etc. ) , all values can be calculated from this equation ...
... equation given above : Rx = ( I in the equation is in amperes . ) 1 I - 1000 If a scale is to be constructed showing the resistance at every 10 % reading ( 0 , 0.1 , 0.2 mA , etc. ) , all values can be calculated from this equation ...
Page 136
... Equation ( Notations as in Section 6.1.2 ; V , is the voltage drop across R , and the movement , R. , is the combined resistance of R , and Rm . ) The current through the meter Im = V Rm The current through the loop From this equation ...
... Equation ( Notations as in Section 6.1.2 ; V , is the voltage drop across R , and the movement , R. , is the combined resistance of R , and Rm . ) The current through the meter Im = V Rm The current through the loop From this equation ...
Common terms and phrases
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