Mil STD 810 H (G) Rain (MIL-STD-810G Method 506.5) Test Room
The Mil STD 810 H (G) Rain Test Room consists of three main procedures. These procedures are as follows:
a. Procedure I – Rain and Rain Wind:
In Procedure I, the rainfall rate used can be adapted based on the predicted deployment area and duration. Although different rainfall intensities have been measured in regions with heavy rainfall, a minimum rate of 1.7 mm/min (4 inches/hour) is recommended, as this is a commonly observed condition and provides a reasonable level of confidence in the material’s performance. MIL-HDBK-310 (Section 6.1, Reference a) provides more detailed information. During pre-test setup, rainfall measurements should be taken at at least 5 random locations. The average of these rainfall rate measurements should be within ± 10% of the specified value, or ± 0.1 mm/min (0.25 inches/hour), whichever is less. To ensure uniform distribution of simulated rainfall on the test object, each measurement should be within ± 25% of the specified rainfall rate, or ± 0.2 mm/min (0.5 inches/hour), whichever is less.
b. Procedure II – Exaggerated:
This procedure (as a guideline) uses a 276 kPa (40 psig) nozzle pressure and a 20.8 L/min (5.5 gal/min) flow rate. This setup should generate water droplets moving at approximately 64 km/h (40 mph) when the nozzles described in Section 4.1.2 are used.
c. Procedure III – Drip:
The drip test requires water droplets to fall at a rate greater than 280 L/m² (7 gal/ft²/hour) from a predefined hole pattern. Alternatively, for items exposed to 140 L/m² (3.5 gal/ft²/hour) of water per hour: The drip rate should be proportionally reduced, provided the test duration is extended to 30 minutes, ensuring the equivalent volume of water is applied to the test object.
Mil STD 810 H (G) Rain Test Room Standards:
- IEC 60529
- EN 60529
- EN 60068
- UL 50E
- UL 60950-1
- TS EN 60529
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