How to check the capacitance of the capacitor

To test the capacity of the flat capacitor, measure the area of its plates and the distance between them. With the help of a special table to determine the dielectric constant of the medium between the plates, and then calculate. To check the capacity of an arbitrary condenser turn it on in the circuit of alternating current of known frequency, clear required readings calculate its formula.

You will need

• ammeter, voltmeter, ruler, calipers, the table, the dielectric constant of different environments.

Instruction

1. Capacity check for arbitrary kondensatorer capacitive resistance of the capacitor in the AC circuit. To do this, assemble the circuit consisting of a capacitor and an ammeter. In parallel with the capacitor connect the voltmeter. Connect the circuit to the AC source of known frequency. Remove the value of the current in amperes (ammeter) and voltage in volts (voltmeter). Divide the value of the voltage at the amperage and get the capacitive resistance of the capacitor (Xc=U/I). In addition to the capacitor in the circuit should not be another burden, and the current source must be variable! The current grow very slowly, so as not to ruin the capacitor. To find the capacitance of the capacitor, number is 1 divide on the value of the capacitance, the frequency of the current in the circuit and the number of 6.68 (C=1/(Xc•f•6,28)). The result will be in Farads, and compare with what is written on the body of the capacitor.
2. Capacity check flat condensatieketel the area of the capacitor plates. In the vast majority of cases the plates of these capacitors are round, so measure its diameter in meters, erect it in the square and divide by 4 and multiply the result by 3.14. If the electrode is a rectangle, multiply the width of this rectangle to its height. A caliper measure the distance between the condenser plates and translate it to meters.
3. If between the plates is a substance with a table of the dielectric permittivity of substances determine its value. If nothing else, consider it equal to 1. The area of one electrode, multiply by the value of the dielectric constant and the number of 8.85•10^(-12) (electric constant) and divide by the distance between the plates. The result will be the capacity of a plane capacitor, which can be compared to the claimed.