Multimeter Electronic By Function Voltage AC and DC
Electronics Multimeter DC Voltage Function
Electronic voltmeters using analog meter drive that is controlled by an electronic circuit by.
Difference amplifier circuit comprised of transistors Q2 and Q1 form a balanced bridge circuit, for this balance is equipped with a variable R RE replaces Q3 and equipped with the ability to achieve excess CMRR (Common Mode Rjection Ratio) high. Forward amplifier using JFET Q1 in the circuit configuration serves as a source follower impedance transformation between input and base of the transistor Q2 is a constant current source. Excess front amplifier FET ability to achieve high input impedance. When the voltage is unknown Vs zero, I2 = I3, VE2 = VE, so no current flows in the drive meter so Im = 0. In this condition gets Q3 bias voltage bias and bias transistor Q2 is a function of the voltage difference at Rs. When the input given positive voltage Vs, the bias on Q2 increases so that the voltage VE2 VE2 increases greater than the current flowing VE3 and Im so that the needle deviated proportional to the magnitude of Vs. In the AC voltage measurement function using the attenuator compensation for using resitor precision attenuator mostly in the form of a kind of wire - wound. Resistors thus have a significant inductance, inductance influence in balance with the installation of capacitors in parallel.
Electronics Multimeter AC Voltage Function
Rectifier circuit shown in the figure above. using Op-Amp circuit as precision rectifier. Non-linear characteristics of PN-junction diode D1 and D2 in the forward direction to give negative feedback. Low pass filter issue a DC pulse is fed to an analog circuit or a counterweight to the digital voltmeter. Most calibrated in rms AC voltmeter, this will not be read rms actual price, without any input signal in the form of pure sine wave.
Multimeter Electronic By Function Voltage AC and DC
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