| 摘要 |
PURPOSE:To discriminate whether an element to be measured or contacting of a used contact pin is defective by testing switching from a measuring circuit to a continuity test circuit. CONSTITUTION:Lead wires of contact pins P1-P3 of a print board package are so constituted that they can be switched from contacts B1-B3 for the measuring circuit of an incircuit tester ICT to contacts M1-M3 for the continuity test circuit by changeover switches S1-S3. If an infinite value is indicated in case of measurement of a resistance element Rx to be measured, the contact of the switch S1 is switched from the contact B1 to the contact M1 to apply a voltage of an AC power source EA. A true contacting defect is discriminating if the needle of an ammeter 1A is not deflected, but contacting is good if a current is flowed. It is confirmed whether contacting of all contact pins used for measurement is good or not, and difference between contacting defect or not of contact pins and defect or not of the element to be measured is clarified. |
