Analysis of error in measurement during destructive double bond pull test

In the destructive double bond test, the experimental results are directly related to the position of the hook and the wire height. But no strict stipulation can be found in GB of MIL-STD. In this article, the effects of the two factors mentioned above on the experimental results are discussed detailedly. It was found that the error in measurement will be -5/spl sim/0% when the greatest wire loop angle /spl theta/ is 120 degree and the hook is put in the center of the wire with accuracy of /spl plusmn/10%. But the error will reach 20/spl sim/29% as /spl theta/ turns to be 100 degree. In order to minimize the error in measurement, ocular micrometer with surveyor´s rod can be used to control the position of the hook, and it was also suggested that the greatest wire loop angle, which is not specified in corresponding standard, should serve as an important control criterion.