JIS Z Test methods for flat pallets (FOREIGN STANDARD). Available for Subscriptions. Content Provider Japanese Industrial Standards [JIS]. Standard (JIS Z ) was performed. From the obtained results, the possibility of practical application was exam- ined. Moreover, the manufacturing process of. JIS Z – JIS Z Test methods for flat pallets. Publication date: ; Original language: English. Please select.
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Subsequent lots are, however, subject to normal inspection. Use first sampling plan below arrow. In general, once a semiconductor device has failed, it cannot be repaired and used again.
When jls can be repaired by renewing a failed device, the mean value of the interval that operation is possible between occurrences of failures is know as the MTBF Mean Time Between Failures. Introduction to Computing Systems 1 st Exam. By inspecting n randomly sampled devices, x defective devices are detected with the probability fH – geo N, R, n, x.
It becomes the determining factor in the life of the device. These functions are shown in figure B.
This model consists of m units connected in series, which i-th unit has ni devices connected in parallel. As the device is subjected to more and more cycles of intermittent operation nas shown in figure B.
JIS Z 0602:1988
Let us first examine a simple binomial distribution model to know concretely what the normal distribution expresses. Js is referred to as upper 20 percent point. From one end of the wafer, each portion is inspected with a microscope. The possible test results are limited to either 1 “failure or defect”or 2 “no failure or acceptance,” with no possibility of such results as “pending decision” or “exception acceptance” allowed.
Shape palameter 2 Refer to Figure B. From equation IX and according to equations. This discrete model is termed the Bernoulli trial or sampling. As time t passes, the failure rate of these semiconductor devices changes. This is analogous to the fact that the remaining life of an adult is not necessarily equal to the expected lifetime of a new born child minus the adult’s actual age. This probability is described by the binomial probability distribution fBin x, n, p.
If the operating time between subsequent failures of a device throughout its life until discarded is given by t1, t2, Such a phenomenon occurs with some probability. The relationship between activation energy and the acceleration factor is shown in figure B.
A.1 AQL Sampling Table
The AQL plan measures nis lot whose fraction defective is p1 as having the lowest acceptable quality level. In chemical reactions, if molecules reach the temperature above which they may react the activation energya reaction occurs. Let us assume that a given lot of semiconductor devices are storage tested at temperature T. R Lot acceptance rate 1.
JIS Z – Test methods for flat pallets (FOREIGN STANDARD)
The reliability function R t for this system is given by the Poisson partial sum. This probability is expressed as follows using equation IX for the Poisson distribution. If two-sided probability of distribution is considered, then the above values, respectively, correspond jia 2. To serve as an example, consider the life L in equation IX That is, it is a non-maintainable component.
Unless otherwise specified, use Inspection Standard II. This process is explained in detail as follows. This occurs in 6002 case of a surge pulse withstand or mechanical impact test. Let us assume that the device will fail when the characteristic value changes to XL. The part of the device which is most susceptible to the applied stress will be the most damaged and will eventually fail.
Also, the probability that a device will not fail before time ti is the reliability function R ti.