Measuring Circuit Equivalent Parameters Using Three-meter Method

I. Experimental Purpose
1. Learn how to use AC voltmeter, AC ammeter and power meter to measure the AC equivalent parameters of components.
2. Learn how to connect and use the power meter.
II. Principle Description
1. The component value or impedance value under the excitation of sinusoidal AC signal can be measured by AC voltmeter, AC ammeter and power
meter to measure the voltage U across the component, the current I flowing through the component and the power P consumed by it, and then
calculate required values. This method is called the three-meter method, which is the basic method for measuring 50Hz AC circuit parameters.
The basic calculation formula is:

(2) Connect a test capacitor of appropriate capacity in series with the component under test. If the terminal voltage of the impedance under test drops, it is judged to be a capacitor.