Abstract: Provided is an insulation resistance measuring apparatus capable of highly precisely measuring an insulation resistance characteristic of a capacitive electronic part in a short period of time while being unaffected by various kinds of noises such as from a power supply, measured power supply and the measured capacitor. A predetermined measurement voltage is applied to a capacitive electronic part, and a current flowing through the electronic part is measured in order to calculate an insulation resistance characteristic of the electronic part. A noise clipper circuit having a resistor and a switch connected in parallel with each other is connected on a path leading from a measurement power supply through the capacitive electronic part to a current detector. The switch is controlled to remain closed in an early stage of charging the capacitive electronic part. When charging the capacitive electronic part has progressed sufficiently, the switch is controlled to open.

Abstract: Actual measured results, which do not agree with a reference measuring system accurately, are corrected to the same level as results measured by the reference measuring system. An interrelating formula between results measured by an actual measuring system and results measured by a reference measuring system is obtained after measuring electrical characteristics of a correction-data acquisition sample by the reference measuring system and the actual measuring system, respectively. Then, by substituting electrical characteristics of a target electronic component measured by the actual measuring system in the interrelating formula for computation, the electric characteristics of the target electronic component is corrected to electric characteristics assumed to be obtained by the reference measuring system.

Abstract: A method of processing a ceramic capacitor includes a first step of applying a DC voltage to a ceramic capacitor by a first DC voltage source, and a second step of applying a DC voltage by a second DC voltage source to generate in the ceramic capacitor a polarization in a direction opposite to a direction of a polarization generated by the application of the DC voltage in the first step, thereby reducing electric charge remaining in the ceramic capacitor.

Abstract: A method and an apparatus for measuring insulation resistance capable of removing the influences of piezoelectric noise which is occurring due to mechanical vibrations applied to an electronic component to measure the insulation resistance of the electronic component with high accuracy. In order to do so, a predetermined measured voltage is applied to the electronic component arranged in a position subjected to periodic mechanical vibrations from the outside to measure a current flowing through the electronic component. Then, the value of the measured current flowing through the electronic component is integrated over the period of the mechanical vibrations or over a time which is an integral multiple thereof. With this arrangement, a piezoelectric noise current can be cancelled and only a leakage current to be primarily measured can be extracted. Thus, by calculating the value of the insulation resistance from the value of the current, the insulation resistance can be detected with high accuracy.

Abstract: Provided is an insulation resistance measuring apparatus capable of highly precisely measuring an insulation resistance characteristic of a capacitive electronic part in a short period of time while being unaffected by various kinds of noises. A predetermined measurement voltage is applied to a capacitive electronic part, and a current flowing through the electronic part is measured in order to calculate an insulation resistance characteristic of the electronic part. A noise clipper circuit having a resistor and a switch connected in parallel with each other is connected on a path leading from a measurement power supply through the capacitive electronic part to a current detector. The switch is controlled to remain closed in an early stage of charging the capacitive electronic part. When charging the capacitive electronic part has progressed sufficiently, the switch is controlled to open.

Abstract: Provided is an insulation resistance measuring apparatus capable of highly precisely measuring an insulation resistance characteristic of a capacitive electronic part in a short period of time while being unaffected by various kinds of noises such as from a power supply, measured power supply and the measured capacitor. A predetermined measurement voltage is applied to a capacitive electronic part, and a current flowing through the electronic part is measured in order to calculate an insulation resistance characteristic of the electronic part. A noise clipper circuit having a resistor and a switch connected in parallel with each other is connected on a path leading from a measurement power supply through the capacitive electronic part to a current detector. The switch is controlled to remain closed in an early stage of charging the capacitive electronic part. When charging the capacitive electronic part has progressed sufficiently, the switch is controlled to open.

Abstract: Direct-current voltage is applied to a capacitor and preliminary charge takes place, and then a measuring voltage is applied and insulation resistance is measured through a charging current flowing the capacitor. The period of the preliminary charge is set to be a period of charging capacitance of a capacitor, and during a period from the end of the preliminary charge to the application of the measuring voltage which is set to be a period in an open state during which the capacitor undergoes self-charging. During the self-charging period, the component of dielectric polarization of the capacitor is self-charged.

Abstract: The insulation resistance of a capacitor is accurately measured within a short period of time by applying AC signals at two different frequencies f1 and f2 to the capacitor to measure the impedance Z1 and Z2 of the capacitor at each frequency. The series resistance Rs and capacity c of the capacitor are obtained from the impedance Z1 at the higher frequency f1, and the insulation resistance Rp of the capacitor is obtained from the impedance Z2, series resistance Rs and capacity C at the lower frequency f2.

Abstract: A method for measuring insulation resistance capable of removing the influences of piezoelectric noise which is occurring due to mechanical vibrations applied to an electronic component to measure the insulation resistance of the electronic component with high accuracy. In order to do so, a predetermined measured voltage is applied to the electronic component arranged in a position subjected to periodic mechanical vibrations from the outside to measure a current flowing through the electronic component. Then, the value of the measured current flowing through the electronic component is integrated over the period of the mechanical vibrations or over a time which is an integral multiple thereof. With this arrangement, a piezoelectric noise current can be cancelled and only a leakage current to be primarily measured can be extracted. Thus, by calculating the value of the insulation resistance from the value of the current, the insulation resistance can be detected with high accuracy.

Abstract: The insulation resistance of a capacitor is accurately measured within a short period of time by applying AC signals at two different frequencies f1 and f2 to the capacitor to measure the impedance Z1 and Z2 of the capacitor at each frequency. The series resistance Rs and capacity C of the capacitor are obtained from the impedance Z1 at the higher frequency f1, and the insulation resistance Rp of the capacitor is obtained from the impedance Z2, series resistance Rs and capacity C at the lower frequency f2.

Abstract: An apparatus for measuring the insulation resistance of an electronic component, such as a capacitor 5, capable of reliable detection of contact even for an electronic component having a small capacitance, in which the capacitor 5 is retained in a retaining groove 21 on a turn table 20. Contact electrodes 13a and 13b are provided on the bottom of the retaining groove 21, and a dummy capacitor 12 is connected to the contact electrodes 13a and 13b is secured to the rear surface of the turn table 20. Measuring terminals 7a and 7b are put in contact with electrodes of the capacitor 5, and an AC current is applied to detect contact from the output thereof. After the detection of contact, a DC voltage is applied from the measuring terminals 7a and 7b, and the insulation resistance of the capacitor 5 is obtained by detecting a leakage current therefrom.