2.27 灰尘

程序

遵循MIL-STD-810G方法510.5程序I（吹灰）。

当被测物在试验室中方向正确并稳定在标准环境温度下时，将空气速度调整到8.9+1.3m/s，或根据被测物的环境测试计划确定。

调整粉尘进料控制，使粉尘浓度为10.6 ± 7 g/m3

除非另有规定，保持步骤1和步骤2的条件至少6小时。如果需要，按照DUT的可靠性测试计划，定期调整测试项目的方向，使脆弱的面暴露在灰尘流中。

停止送尘。将空气速度降低到大约1.5±1米/秒，并将温度调整到测试计划中所述的所需的高操作温度。

在测试项目温度稳定后，保持步骤4的条件至少1小时。

将空气速度调整到步骤1中使用的速度，并重新开始进灰，以保持步骤2中的灰尘浓度。

继续曝晒至少6小时或按其他规定进行。

停止送尘，让物品恢复到标准环境条件。停止任何气流，让灰尘沉淀。

通过刷子、擦拭或摇晃从测试物品上清除积累的灰尘，注意避免引入额外的灰尘或干扰任何可能已经进入DUT的灰尘。(除非有明确的规定，否则不要通过喷气或真空清洁来清除任何灰尘）。

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N018鉴定计划 第16页

操作设备并将结果与预试验数据进行比较。

标准

本测试没有设定通过/失败的标准。它的目的是探索性的。所有的结果都应该被记录和审查。

报告和行动

测试后的单元图像必须包括在报告中。任何性能的退化或失败都应报告，并进行根本原因分析。在测试过程中必须采集和记录以下数据。

试验室性能 - 应创建一个图表，显示试验室对测试曲线的表现。最好是在同一张图上显示轮廓设置点和试验室的测量结果。

DUT操作 - 通常情况下，产品在测试过程中被操作，因此有内在的数据点，无论DUT是否运行。最好是将其记录为小到1秒的连续记录，但也可以简单到由技术人员进行定时检查。

照片 - 每个轴迭代后和测试结束时的装置照片应在报告中提供。

DUT测试后的性能 - 数据或关于DUT和关键部件从试验室移出后如何操作的描述。

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2.27 Dust

Procedure

Follow MIL-STD-810G Method 510.5 Procedure I (Blowing Dust)

 With the DUT oriented correctly in the chamber and stabilized at standard ambient temperature adjust the air velocity to 8.9 + 1.3m/s, or as otherwise determined from the DUT’s environmental test plan

 Adjust the dust feed control for a dust concentration of 10.6 ± 7 g/m3

 Unless otherwise specified, maintain the conditions of Steps 1 and 2 for at least 6 hours. If required, periodically reorient the test item to expose vulnerable faces to the dust stream as outlined in DUT’s reliability test plan.

 Stop the dust feed. Reduce the air velocity to approximately 1.5 ± 1 m/s and adjust the temperature to the required high operational temperature as described in the test plan.

 Maintain Step 4 conditions for a minimum of 1 hour following test item temperature stabilization.

 Adjust the air velocity to that used in Step 1 and restart the dust feed to maintain the dust concentration as in Step 2.

 Continue the exposure for at least 6 hours or as otherwise specified.

 Stop the dust feed and allow the item to return to standard ambient conditions. Stop any airflow and allow the dust to settle.

 Remove accumulated dust from the test item by brushing, wiping, or shaking, taking care to avoid introduction of additional dust or disturbing any that may have already entered the DUT. (DO NOT remove any dust by either air blast or vacuum cleaning unless specified to do so).

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N018 qualification plan Page 16

 Operate the unit and compare results with pretest data.

Criteria

There is no pass/fail criteria set for this test. It is meant to be exploratory. All results should be documented and reviewed.

Reports and Action

Images of the unit after the test must be included in the report. Any degradation or failure in performance should be reported with root-cause analysis. The following data must be captured and recorded during the test:

 Chamber performance - A plot should be created that shows how the chamber performed against the test profile. It is best to show the profile set points and the chamber measurements on the same plot.

 DUT Operation - Typically product’s are operated during the test and therefore have the innate data point on whether the DUT is operating or not. It is best if this is recorded as a continuous record of intervals as small as 1 second, but it can be as simple as a timed check by a technician.

 Photos - Photos of the unit after each axis iteration and at the end of the test should be supplied in the report

 DUT Post-Test Performance - Data or a description on how the DUT and critical components operate after removal from the chamber.