Often, in order to work in a range of electrical oscillations of sound frequencies it is necessary to select the same capacitors. This and various or balanced bridge circuits, and is identical (for electrical options) the channels of a stereo or Quad amplifiers…
In the simplest case, the selection of containers can be done by connecting the “common” wire avometr (tester) and a sound generator between them. Then the investigated capacitor should be connected between the “phase” wires. Avometr should be prepared for the measurement of AC voltage in the range of 0.1—1 V output parameters of ZG should be installed so that the indications of pointer indicator accounted for 0.4—0.7 In (at the named site and scale more linear, and the accuracy of the measurement above).
When everything is prepared, by replacing the capacitors in the measuring circuit and tracking readings avometr (and they should be identical at equal capacities) is determined by the equality of the capacitances of the test capacitors or difference: with less capacitance deviation of the instrument pointer will be smaller and Vice versa. When open condenser avometr will not show any voltage, and with the closure (or strong contrast capacity in a big way) — the needle will go overboard.