?“V “, marked in the picture, is a high-frequency high-voltage detection power supply, with the two terminals connected to the emitting electrode  and the receiving electrode respectively.     “C1” and “C2” are the capacitance values between the electrode and the capacitor respectively (due to the partition of the VIAL bottle wall, the electrode cannot contact the liquid inside, so the capacitance is generated) ?“R” is the resistance value of the liquid medicine. When the product does not leak, an induced micro-current “I1” is generated ?When the ampoule bottle leaks, the capacitance between the insulating bottle wall and the electrode disappears, the capacitive reactance generated by the capacitor is zero, and a large micro-current “I2” is generated in the circuit. ? Generally speaking, The changes happens that the high-voltage current passes through the transmitter into the bottle and reaches the receiving electrode in the current value, which is used to confirm whether the product under inspection has a large leakage current and judge whether the product is leaking.