MIL-STD-202H.pdf - 第135页

MI L - S TD - 202 - 207 FI GURE 1 . High - impact shock - tes ting apparat us . 3 北测（上海）电子科技有限公司联系方式：xuyj@beice-sh.com 13917165676

MIL-STD-202-207

4.4 Hammers. The test apparatus is equipped with two 400-pound hammers. One hammer renders a blow by a

vertical drop. The other hammer applies a force in a horizontal direction. In this manner, and by changing the

orientation of the anvil plate, blows may be delivered to the anvil and the parts in three directions.

4.5 Mounting fixtures. Figure 4A, figure 4B, figure 5, and figure 6 show standard mounting fixtures that shall be

used when testing parts with this test apparatus. These mounting fixtures simulate platform and panel mountings.

The applicable mounting fixture shall be as specified. When one of the standard mounting fixtures shown on figure

4A, figure 4B, figure 5, and figure 6 cannot be used, the individual specification shall specify a mounting fixture or

adapter which approximates the actual rigidity encountered in service.

4.6. Procedure.

4.6.1 Mounting method. The specimens shall be installed by their normal mounting means on the mounting fixture

in their normal operating position. Bolts for mounting the parts shall conform to type I, type II, or type III, grade 2, of

MIL-DTL-1222, Studs, Bolts, Hex Cap Screws, Socket Head Cap Screws and Nuts. Mounting bolts shall be checked

for tightness before each blow. Care shall be taken in the mounting procedure to prevent initial stresses being

applied to the specimens prior to shock.

4.6.2 Anvil-plate bolts and positioning springs. Due to the severity of the shock applied to the anvil plate by a

series of three blows, the anvil-plate bolts shall be checked for tightness before each series of blows. The spacing

between stops of the positioning springs (1.5 inches) shall also be corrected before each succession of blows.

4.6.3 Direction of shock. A total of nine blows, three through each of the three principal mutually perpendicular

axes for the heights indicated in 4.6.4, shall be delivered to the anvil plate supporting the specimens under test.

Direction of the shock shall be, in order, to the back, top, and side. Back and top blows shall be applied with the anvil

plate located to receive blows from the horizontal and vertical hammers. Side blows are delivered by the horizontal

hammer contacting the end shock pad of the anvil plate (see 4.3).

4.6.4 Height of hammer drops. The hammer shall strike the shock pad on the anvil plate, in sequence, from

heights of 1 foot, 3 feet, and 5 feet.

4.6.5 Hammer supports. During the test, the hammer not in use shall be disengaged from the lifting cable and

supported so that the hammer and its support are not in contact with the anvil plate.

4.6.6 Electrical load and operating conditions. The electrical load and operating conditions applied to the

specimens shall be as specified.

4.6.7 External resilient mountings. Unless otherwise specified, no external resilient mountings associated with the

specimen being tested shall be used. Integral mounting devices and external resilient mountings (if specified)

associated with the specimen shall remain unblocked during tests.

北测（上海）电子科技有限公司

联系方式：xuyj@beice-sh.com 13917165676

MIL-STD-202-207

FIGURE 1. High-impact shock-testing apparatus.

北测（上海）电子科技有限公司

联系方式：xuyj@beice-sh.com 13917165676

MIL-STD-202-207

FIGURE 2. High-impact shock-testing apparatus (backview) with anvil plate

located for back and top blows.

北测（上海）电子科技有限公司

联系方式：xuyj@beice-sh.com 13917165676