To check the capacity of the flat condenser, measure the area of its plates and distance between them. Define dielectric permeability of the environment between plates by the special table and make calculation. For check of capacity of any condenser turn on it in a chain of alternating current with the known frequency, take the necessary readings calculate it on a formula.
It is required to you
- ampermeter, voltmeter, ruler, caliper, table of dielectric permeability of various environments.
Instruction
1. Check of capacity any to a kondensatoraizmerta condenser capacitance in this chain of alternating current. For this purpose collect the chain consisting of the condenser and the ampermeter. Parallel to the condenser attach the voltmeter. Connect a chain to a source of alternating current with the known frequency. Remove values of current in amperes (ampermeter) and tension in volts (voltmeter). Divide value of tension into current and receive the capacitance of the condenser (Xc=U/I). Except the condenser in a chain there should not be other loading, and the source of current has to be variable! Increase current very slowly not to damage the condenser. To find condenser capacity, divide number 1 into value of capacitance, current frequency in chains and number 6.68 (C=1 / (Xc •. Result receive f•6.28)) in Farads and compare to the fact that it is written on the case of the condenser.
2. Check of capacity flat you kondensatoraopredelit the area of a facing of the condenser. In most cases of a facing of such condensers round therefore measure its diameter in meters, square it and divide into 4, and increase result by 3.14. If the facing represents a rectangle, increase width of this rectangle by its height. Measure by a caliper distance between plates of the condenser and transfer it to meters.
3. If between plates there is a certain substance, define its value by the table of dielectric permeability of substances. If there is nothing, consider it equal 1. Increase the area of one facing by value of dielectric permeability and number 8.85 • 10^(-12) (an electric constant) also divide into distance between plates. Capacity of the flat condenser which can be compared to stated will be result.