MIL-DTL-83517A
APPENDIX
Test fixtures and fixture extension where required are illustrated in the following figures.
Calibration and test orientation for a tab terminal.
FIGURE A-2.
a.
b.
FIGURE A-3.
Calibration and test orientation for .010 diameter and extended terminal.
FIGURE A-4.
Calibration and test orientation for .050 diameter and slotted terminal.
c.
d.
FIGURE A-5.
e.
FIGURE A-6.
FIGURE A-7.
Accessory alignment gauge.
f.
g.
FIGURE A-8.
h.
FIGURE A-9
Configuration of final test fixture and device under test with extension.
FIGURE A-10.
Contact resistance simulated mounting surface for SMA flange mount
i.
connectors.
j.
FIGURE A-11. SMA test tool for center contact retention.
A.3.5 Test fixtures.
A.4 PROCEDURE FOR RF LEAKAGE
A.4.1 RF leakage (see 4.5.13). The measurement of the leakage from connectors is performed by
collecting the leakage energy in a coaxial system surrounding the leakage source. An outline of the
instrumentation is shown on figure 4. The device from which leakage is to be measured is incorporated in
a uniform transmission line which is terminated in a matched load. The matched termination simplifies
both the measurement procedure and data reduction. This complete coaxial system is embodied within a
cylinder which forms, externally, a second coaxial system. The second coaxial system is terminated at
one end in an adjustable short-circulating plunger and at the other in a tapered transition terminated in a
matched detector.
For direct leakage measurements, the adjustable short circuit serves several purposes.
The short-circuit position is adjusted to assure that an adequately low impedance appears behind the
equivalent leakage generator. A matched termination can be substituted, but the resulting 6dB loss
cannot be tolerated in some cases. In addition, if the leakage source is directional, as it indeed is for
connectors with multiple leakage, it is possible for the leakage to be directed to this termination at some
frequencies and not collected by the detector. For surface transfer-impedance measurements on
connectors with leakage from more than one point in the connector, a matched termination is desirable in
order to simplify the transformation of the measured data to absolute transfer impedance data. This is not
needed to make relative comparisons in this test.
The equivalent leakage generator, in general, can have field components in the radial, axial, and
circumferential* directions. Furthermore, these components are not necessarily circularly symmetric.
Locally, TE, TM, and TEM modes can all exist, and in fact, for complete leakage measurements, the
detector should couple to all but the measurement is more complex in this case. The excitation of the
outer coaxial line, however, is believed to be principally TEM, since the currents in the internal line are
predominantly axial and symmetric. It is however, possible to have a symmetrical leakage current which
can generate the above mentioned modes. It is recommended that all measurements be made below the
frequency that the higher order modes can propagate in the outer coaxial line.
The characteristic impedance of the outer coaxial line of the tri-axial system, which is formed with the
inner conductor, should be matched to the detector. 50 ohm coaxial circuits are generally desired for
convenience.
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