source:power adapter Popular:adapter release time:2021-10-12 10:05:41 Article author:sznbone
Reliability index of adapter products
1. Reliability: The reliability of the product is the probability of normal operation, which refers to the probability that the product will complete the specified function under the specified conditions and within the specified time. When calculating the reliability, the larger the number of products at the beginning of the test and the smaller the test interval, the higher the accuracy of the reliability.
When evaluating product reliability, it is also often expressed as failure probability or damage probability. The failure probability is the probability of the corresponding event of the reliability. Reliability and failure probability are very simple and intuitive to assess the reliability of components, switching power supplies, transformers, chargers or complex systems. The greater the reliability, the lower the probability of failure and the higher the reliability.
2. Average life: The average life of a product refers to the average normal working time of the product, which has different meanings for unrepairable products and repairable products.
For non-repairable products, the average life span refers to the average working time before the product fails, usually called MTTF, which is the average time before failure.
For repairable products, the average life span refers to the average working time between two adjacent failures, that is, the average working time without failure, usually called MTBF, which is the average time between failures.
MTTF and MTBF have similar meanings, and their mathematical expressions are also consistent.
3. Failure rate: The failure rate (failure rate, failure intensity) of a product at any time t is defined as the probability of failure in a unit of time after the product works to time t. It can also be said that the failure rate is equal to the ratio of the number of product failures in a unit time after time t to the number of products still working at time t.
Failure rate is often used to indicate the reliability index of electronic products and components. The lower the failure rate, the higher the reliability. The unit of failure rate is the percentage of time, such as %/h, %/kh, which represents the percentage of the number of failures of the tested product within 1 hour (or 1000 hours). Fit is commonly used abroad as the unit of failure rate, that is, 1 failed component occurs after 1 million components work for 1000 hours, which is called 1 fit.
4. Failure density: Product failure density (fault frequency) refers to the ratio of the number of failed products per unit time to the initial number (total) of the tested products. Products that fail during the test will not be exchanged.
The unit of failure density is 1/h, which is the ratio of the number of products that fail per hour to the total number of products tested.
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