Basic Electrical Measurements |
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Page 68
... true voltage and V , the original voltage read- ing of the instrument . Example 3.8 A 1000 - S2 / V voltmeter on the 10 - V scale indicates 6.25 V be- tween the two measurement points . A 10 - k resistor in parallel with the meter drops ...
... true voltage and V , the original voltage read- ing of the instrument . Example 3.8 A 1000 - S2 / V voltmeter on the 10 - V scale indicates 6.25 V be- tween the two measurement points . A 10 - k resistor in parallel with the meter drops ...
Page 73
... voltage to half ( 1.63 ) is 5600 N. The true voltage V = 3.26 X 5600 5000 = 3.65 V and Rs = € 5000 3.65 - 3.26 3.26 = 600 Ω ( To drop Im to half , that is , cause the reading to halve , the total loop resistance must be doubled ; that ...
... voltage to half ( 1.63 ) is 5600 N. The true voltage V = 3.26 X 5600 5000 = 3.65 V and Rs = € 5000 3.65 - 3.26 3.26 = 600 Ω ( To drop Im to half , that is , cause the reading to halve , the total loop resistance must be doubled ; that ...
Page 74
... true voltage is similar if the output impedance and input impedance are known . In this case no auxiliary measure- ment with Re is necessary . Example 3.14 The output signal of a transmitter has an output impedance of 5.6 k and the ...
... true voltage is similar if the output impedance and input impedance are known . In this case no auxiliary measure- ment with Re is necessary . Example 3.14 The output signal of a transmitter has an output impedance of 5.6 k and the ...
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