Basic Electrical Measurements |
From inside the book
Results 1-3 of 6
Page 45
... resistor . Using an adjust- able regulated current source makes the job even simpler - if it can be found at the time of need . The adjustable resistor ( or decade box ) must have a sufficient value to keep the current below the limit ...
... resistor . Using an adjust- able regulated current source makes the job even simpler - if it can be found at the time of need . The adjustable resistor ( or decade box ) must have a sufficient value to keep the current below the limit ...
Page 47
... Decade Box Instead of the voltmeter , a resistor or decade box ( R. ) with a switch can be wired parallel to the measured movement ( Figure 2.8 ) . First , with the switch ( Sw ) open , R , is adjusted for full - scale deflec- tion and ...
... Decade Box Instead of the voltmeter , a resistor or decade box ( R. ) with a switch can be wired parallel to the measured movement ( Figure 2.8 ) . First , with the switch ( Sw ) open , R , is adjusted for full - scale deflec- tion and ...
Page 73
... decade box , the resistance on the box to drop the 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 ...
... decade box , the resistance on the box to drop the 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 ...
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