MIL-PRF-19207G
4.6.16.4 Watertight. The fuseholder containing a test fuse shall be mounted, with fuseholder cap
exposed, on one face of a watertight enclosure. The test shall be made in accordance with MIL-STD-108
or other equivalent test methods as approved by the qualifying agency (see 3.5.1.4).
4.6.16.5 Watertight and body sealed. The fuseholder shall be subjected to the watertight test as
specified in 4.6.16.4. The fuseholder shall then be removed from the test panel and the cap removed
from the body. A cap which has been drilled through the metal insert at the test probe hole and fitted with
a sealed tube for adaption to a source of compressed air shall then be assembled to the fuseholder body.
The complete fuseholder shall then be immersed in fluid such as tap water, and a differential of 15
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pounds per square inch (lb/in ) gauge shall be applied for a period of 1 minute. No air bubbles shall
appear (see 3.5.1.5).
MIL-STD-202. The following details and exceptions shall apply:
a. Test condition letter - A, except as otherwise specified (see 3.1).
b. Measurements after cycling - Fuseholders shall be examined for evidence of physical damage.
4.6.18 Salt atmosphere (corrosion) (see 3.5.17). Fuseholders shall be tested in accordance with
method 101 of MIL-STD-202. The following details and exceptions shall apply:
a. Test condition letter - A or B, as specified (see 3.1).
b. Special mounting and details - Test fuses shall be assembled into each fuseholder if required to
effect proper seal between fuseholder cap and body.
After the test, fuseholders shall be visually examined for evidence of excessive corrosion or
mechanical damage.
4.6.19 EMI/RFI shielding (when specified, see 3.1).
shall be mounted by its normal mounting means to an electrically conductive panel. The resistance shall
be measured from the RFI shielding on the fuseholder (plated surface) to the mounting panel. The
measurement shall be made using an open circuit voltage of 6 V dc ±1 V dc and a maximum current of
100 mA ±10 mA.
4.6.19.2 Shielding efficiency (when specified (see 3.1 and 3.5.18). Fuseholders shall be tested utilizing
a test setup (or equivalent) as shown in figure 1. Measurements shall be made as follows:
a. With the door open and the antennas in the "initial setup" position, establish a test level over the
200 MHz to 1 GHz range such that the received signal level is at least as many dB above the RF
ambient level as that of the shielded enclosure attenuation.
b. Record the received signal level and the signal generator output level. Repeat measurements at
200 MHz, 400 MHz, 600 MHz, 800 MHz and 1,000 MHz.
c.
Move the antennas to the final test positions, close the door and with an RF-tight blank panel
between the antennas, measure the integrity of the enclosure by setting the signal generator to
the same output and record the received signal level for each frequency used in 4.6.19.2b. The
shielded enclosure attenuation is then calculated using the following equation:
E1
Attenuation (dB) = 20 log
E2
Where E1 is the receiver reading in paragraph 4.6.19.1 and E2 is the receiver reading in
paragraph 4.6.19.2.
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