![]() This makes it also possible to measure ESR, ESL values and parasitic capacitances. Resistances, inductances and capacitances as well as their combinations can be easily measured. What is it good for?Īn impedance analyzer basically extends the capabilities of a standard multimeter into the AC range. It is measured with an Impedance Analyzer, which performs a frequency sweep and usually gives the magnitude of the impedance and the phase angle. So a calculated impedance is only valid for a specific frequency. As we can see, for a resistor, which ideally only has a real part ( X = 0), the impedance equals the resistance and we are back at Equation 1.īut if we have an imaginary part, the impedance will change with applied frequency. The magnitude of the impedance is calculated by Pythagorean addition of R and X ( 4). ![]() The phase is represented by the arctangent of the quotient of X and R ( 3). The impedance is composed of a real R and imaginary part X ( 2). The correlation of voltage and current is described by impedance. By applying a sinusoidal voltage to a circuit the current can be shifted by -90 to 90 degrees. A change in voltage results in an immediate change in current.įor AC voltages, things are more complicated. ![]() When a DC voltage is applied to a resistor a certain current can be measured, determined by Ohm’s law ( 1). To put it simply, impedance is the resistance of a circuit when a AC voltage is applied. ![]()
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