Basic Electrical Measurements |
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Page 38
... readout . If an instrument is labeled “ digital , ” it should have all internal data handling and mathematical operations performed digitally . Analog instruments ( those with analog internal operation ) may have analog or digital readouts ...
... readout . If an instrument is labeled “ digital , ” it should have all internal data handling and mathematical operations performed digitally . Analog instruments ( those with analog internal operation ) may have analog or digital readouts ...
Page 49
... readout . The movement is directly accessible , bypassing all other internal components , if the meter is switched ... Readout Electronic voltmeters ( EVMs or TVMs ) have a de amplifying stage between the input and the readout meter ...
... readout . The movement is directly accessible , bypassing all other internal components , if the meter is switched ... Readout Electronic voltmeters ( EVMs or TVMs ) have a de amplifying stage between the input and the readout meter ...
Page 50
... readout . Digital EVMs combine an amplifier with the analog - to - digital converter . Since solid - state devices need a mini- mum voltage and current for operation , simple digital panel meters may have an amplifier stage if the ...
... readout . Digital EVMs combine an amplifier with the analog - to - digital converter . Since solid - state devices need a mini- mum voltage and current for operation , simple digital panel meters may have an amplifier stage if 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