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2.31 雨

程序

遵循MIL-STD-810G方法506.5程序I（雨和吹雨）。

尽可能地将测试项目稳定在测试室的标准环境条件下。

进行完整的测试前检查并记录结果。

按要求的试验项目配置准备好试验项目。

如果水和测试物品之间的温差小于10°C，要么将测试物品加热到比雨水更高的温度，使测试物品的温度在每个暴露期开始时稳定在比雨水温度高10+2°C，要么冷却水。在测试前立即将测试物品恢复到其正常的工作状态。

将试验品放在设施中并处于正常的操作位置，按照可靠性试验计划中的规定调整降雨率。

以可靠性试验计划中规定的速度启动风速，并保持至少30分钟。

如果需要，在30分钟雨量的最后10分钟内进行试验操作。

重新加热试验品。旋转试验品，使其暴露在雨和吹风源中，使其暴露在试验品部署周期中可能暴露在吹风雨中的任何其他一面。

重复步骤1到4，直到所有表面都被测试过。

在试验室中检查试验品（如果可能的话），否则，将试验品从试验设施中取出，进行目测检查。如果水已经渗透到测试项目中，在对测试项目进行操作之前必须进行判断。可能有必要将水从试验品中排空（并测量其数量），以防止出现安全危险。

测量并记录在测试项目的保护区域内发现的任何自由水。

如果需要，操作测试项目以符合要求文件的规定，并记录结果。

标准

如果在测试结束时，在声学室（低音扬声器外壳本身）或分频器/变压器室中没有积水，则该扬声器将通过。这些是对型号A、B和C的要求。

报告和行动

在测试结束后，应创建一份测试报告，其中包括以下内容。

每段测试的视觉观察或发现结果的摘要。

如果水渗入DUT的任何部分，应记录水量的测量。

测试后单元的功能应该被记录下来，并包括任何适用的指标。

2.31 Rain 

Procedure 

Follow MIL-STD-810G Method 506.5 Procedure I (Rain and Blowing Rain) 

• Stabilize the test item at standard ambient conditions in the test chamber whenever possible. 

• Conduct a complete pretest examination and document the results. 

• Prepare the test item in the required test item configuration 

• If the temperature differential between the water and the test item is less than 10°C, either heat the test item to a higher temperature than the rain water such that the test item temperature has been stabilized at 10 +2°C above the rain water temperature at the start of each exposure period, or cool the water. Restore the test item to its normal operating configuration immediately before testing. 

• With the test item in the facility and in its normal operating position, adjust the rainfall rate as specified in the reliability test plan. 

• Initiate the wind at the velocity specified in the reliability test plan and maintain it for at least 30 minutes. 

• If required, operate the test for the last 10 minutes of the 30-minute rain. 

• Reheat the test item. Rotate the test item to expose it to the rain and blowing wind source to any other side of the test item that could be exposed to blowing rain in its deployment cycle. 

• Repeat Steps 1 through 4 until all surfaces have been tested. 

• Examine the test item in the test chamber (if possible), otherwise, remove the test item from the test facility and conduct a visual inspection. If water has penetrated the test item, judgment must be used before operation of the test item. It may be necessary to empty water from the test item (and measure the quantity) to prevent a safety hazard. 

• Measure and document any free water found inside the protected areas of the test item. 

• If required, operate the test item for compliance with the requirements document, and document the results. 

Criteria 

The speaker would pass if at the end of the test there is no water buildup in the acoustic chamber (the woofer enclosure itself) or in the crossover/transformer chamber. These are requirements for models A, B and C. 

Reports and Action 

A test report should be created at the end of the test that has the following: 

• Summary visual observations or finding results for each segment of the test. 

• If water penetrated into any portion of the DUT, measurements of the amount of water should be recorded. 

• Functionality of the unit post test should be recorded and included with whatever metrics are applicable.