MIL-DTL-83538D
b. A sliding circumferential short shall be positioned behind the connector on the signal input end of
the fixture to provide for tuning the outer coaxial line for maximum output at each test frequency.
The allowable travel of this short shall be greater than one-half wave length at the lowest test
frequency of 1.5 meters minimum for 100 MHz. The inner coaxial line shall be terminated in a
fixed 50-ohm load impedance behind the connector at the output end of the fixture.
c. The connectors used to couple together the various elements of the test system shall be of a low-
leakage type which have a nominal impedance of 50 ohms, a VSWR of less than 1.5, and a
minimum leakage attenuation of 100 dB. The output impedance of the signal source and the input
impedance of the detector shall be nominally 50 ohm with a maximum VSWR of 1.5. The input
and output VSWR of the standard attenuator shall be less than 1.5 in the 20 to 100 dB range.
d. The relative signal level in the variable attenuator shall be equaled to the signal level through the
leakage fixture by adjusting the attenuator. The signal loss in the fixture can then be read from the
setting on the variable attenuator.
e. A suitable fixture shall apply the holding force specified in 3.4.7.2 to hold the connector pair
together.
4.6.22.2 EMI shielding (from 1 GHz to 10 GHz). The EMI shielding effectiveness of mated connectors
with EMI backshells shall be measured using the mode-stirred technique specified in test procedure
EIA-364-66.
4.6.23 Insertion loss. Not applicable to the MIL-DTL-83538/11 buffer plug (see 3.27).
4.6.23.1 Contact resistance. Connectors shall be tested in accordance with the contact resistance test
method of SAE-AS39029. The following details and exceptions shall apply:
a. The test shall be conducted on the wired and mated set of launcher receptacle, buffer plug
(not MIL-DTL-83538/11) and store receptacle.
b. The total measured maximum resistance through the combined mated sets of launcher receptacle
with buffer plug and store receptacle with buffer plug shall be 3 times the limits of SAE-AS39029
for the applicable size contacts.
c. A suitable fixture shall apply the holding force specified in 3.4.7.2 to hold the connector pair
together.
4.6.23.2 RF insertion loss. A wired and mated set of launcher receptacle, buffer plug
(not MIL-DTL-83538/11) and store receptacle shall be individually tested as shown on figure 11. Insertion
loss of a mated connector set is defined as the increase of a loss due to insertion of mated connectors in
a cable; this includes the reflection losses to the cable and the dissipating losses in the pair.
First insert cable assembly number 1 and tune out its input VSWR by means of tuner number 4 and
balance setup. Then insert the cable assembly number 2 which includes the connector set under test.
With tuner number 4 in the same position and the electrical length of the cable assembly the same as that
of number 1, record increase of insertion loss; add to this as a correction, the cable loss of the removed
section due to the length ĆL1 + ĆL2 at this frequency. The sum of the increase and the correction is the
insertion loss of the connector set. This shall be repeated for the other mated sets.
The following details shall apply:
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