The basics of power supply testing that you must know

　　1. Basic principles of testing

　　Based on standards (IEC standards and other international standards, national standards, ministerial standards), development specifications, enterprise standards, and test specifications, and guided by test data, we evaluate the power system from the user's perspective and expose functional defects and potential faults during the testing phase.

　　The module indicators shall be based on the development specifications and enterprise standards. When the test items are not clearly defined in the development specifications and enterprise standards, the default reference indicators of the system indicators in the test specifications or industry standards shall prevail.

　　The testing work is not affected by the attitude and ideas of the project development team or other factors that interfere with the testing process, and is carried out independently according to the testing process.

　　For module testing in the prototype stage (except for module optimization testing), a loop test is performed first. If the loop test fails, the test is completed and the module is returned to the project team for modification. The test application is then resubmitted and the next cycle of testing is started.

　　During the prototype test, if the test problem is serious and has affected the smooth progress of the module test, the test needs to be stopped before modifications are allowed on the tested system. After the project development team modifies the problem and completes the self-test, it resubmits the test application and moves on to the next cycle of testing. In other cases, the test problem can only be modified and tested on the second set of prototypes, and records are kept. In the next test phase, the modified test problem is systematically verified and other project tests are carried out.

　　Pilot testing focuses on the replication results of the designed product - whether the replica's performance and indicators meet the standards.

　　2 Technical Indicators

　　When the indicators of the development specification or enterprise standard are lower than the relevant industry regulations, the development specification or enterprise standard needs to be revised. Otherwise, the development specification or enterprise standard will be judged as unqualified according to the industry standards, and the General Office will be requested to re-evaluate the development specification or enterprise standard.

　　(1) Definition of indicators

　　The departmental standard is the lowest standard. When the development specification is superior to the departmental standard, national standard or international standard, the development specification and enterprise standard shall prevail: indicators without special instructions are the indicator requirements defined in the development specification, project task book and relevant standards, and are the basic indicators that the product must have.

　　(2) Traction index

　　In accordance with the principle of "using testing technology to drive development technology", we move closer to international standards to guide the development of the company's product technology indicators.

　　3. Classification principles for unqualified test items

　　3.1 Type A problems (fatal problems):

　　All projects that threaten the personal or property safety of users;

　　Any item that causes the product to malfunction or seriously deteriorate in performance.

　　3.2 Category B issues (serious issues):

　　Projects whose technical indicators fail to meet the requirements of product development specifications or corporate standards;

　　Items that may cause product damage under various non-destructive extreme conditions (such as extreme transients, etc.);

　　Insufficient loop test margin.

　　3.3 Type C questions (general questions):

　　Items that do not affect product functions and performance, such as: unqualified product appearance and logo items, local temperature rise at measurement points not defined in the test specifications, etc.;

　　Projects whose technical indicators do not reach the traction indicators;

　　Test items with insufficient margin testing (inadequate loop margin testing is a serious problem). 3.4 Type D issues (discussion questions):

　　Projects that failed the research test;

　　Items that are not clearly defined in the development specifications (or corporate standards) and test specifications;

　　For test items that have failed and ended, there are disagreements between the tester and the tester, and there is no reference basis for judgment;

　　The impact of problems found during testing on users cannot be confirmed.

　　4 Product judgment criteria

　　4.1 Qualification

　　There are no A and B unqualified items, and the number of C unqualified items is no more than 3, and the module is judged to be qualified.

　　4.2 Determination of non-conformity

　　For A and B type problems, if one item fails, the module will be judged as unqualified;

　　For Category C questions, if more than three items (not including three items) are unqualified, the module is judged to be unqualified.

　　4.3 Determination of Class D Problems

　　The overall team and the expert team will determine the impact of the constraints on technology, market, production, cost, etc. on whether the system is qualified or not.

　　The judgment results of Category D problems shall be the responsibility of the overall group and the expert group and shall not be included in the evaluation index scope of the testing department.