| 摘要 |
PURPOSE:To enable accurate measurement of a resistance value in an electric circuit such as an integrated circuit without errors, by integrating two conductive rods with an insulating body interposed therebetween at a measuring terminal of a laser trimmer. CONSTITUTION:Measuring terminals 4 (4a-4j) each have two parallel conductive rods 6 and 6' integrated with an insulating body 5 interposed therebetween. The terminals 4a, 4b,... are fastened on the periphery of a window hole 3 and needle-like pointed ends thereof are brought into contact with required measuring points 9a and 9b of an IC circuit board 8 to conduct. A constant current source 11 is joined between a base end of the conductive rod 6 at the terminal 4a and a base end of the conductive rod 6 at the terminal 4b to measure a current value thereof with an ammeter 12 and a voltmeter 13 is connected between a base end of the conductive rod 6' at the terminal 4a and a base end of the conductive rod 6' at the terminal 4b. Then, a voltage drop due to a thick film resistance 10 to be measured is measured with a voltmeter 13 through the conductive rod 6 and as a result, the resistance value of the resistance 10 is obtained.
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