What is an impedance bridge?
Modern impedance bridge is a device used to measure impedance, capacitance or induction. The grandfather of the generalized impedance bridge is the Wheatstone bridge, an electric circuit that Samuel Christie invented in 1833 and popularized about ten years later by Sir Charles Wheatston. The value of wheat stones with their characteristic diamond circuits use two fixed impedary resistors and a variable resistor to measure the unknown impedance of the fourth resistor. Modern devices can be switched from DC to alternating current (AC) and back. Both Wheatstone Bridge and its modern descendant, a generalized impedance bridge, work on the same principle, which is a balance of electrical circuit. The basic idea is that if the circuit contains two resistors of a known value, it can be used to determine the value of unknown resistance and measuring device variable resistor and the opposition of the unknown value known as a potentiometer is used to find out when a variable resistor reaches the circuit. In the form of an equation r 1 /r 2 = r (u) /r var where r It is that it is realized, it is that it is vanic, and it is resistant because it is a resistor . impedance at any moment.
Modern impedance bridges have several circuits. One of the districts will probably be the original test district, reading in Ohms, also known as an ohm meter. Other circuits may include different combinations of resistors, capacitors, induction coils and possible signal and power generator. With these circuits, the modern impedance bridge can test many electrical equipment and circuits, from resistors and capacitors up to the tuning of the antenna. AC circuits of Aznova more complex than DC circuits because the circuit does not capitalize until it is foFrom AC the same on both sides of the bridge.
The potential problem for the sensitive AC bridge circuits is that the capacitors tend to "escape" the current. Strah current from the capacitor leakage will generate incorrect detections in the detector or meter. The solution to the problem is to add what is called the perimeter of the Wagner country. The Wagner Earth circuit is the divider of the ground voltage designed to have the voltage ratio and the phase shift as each side of the bridge. Often there is a switch of two positions that allows the user to confirm that the circuit has been set correctly, and when the potentiometer registers zero in both switches positions, reading without errors is guaranteed.