MIL-DTL-87104C
4.6.2.3.1 Test setup.
4.6.2.3.1.1 Test equipment and apparatus. A signal generator, matched loads, detectors, and associated
instrumentation shall be required. The test equipment shall be capable of providing a continuous measurement of RF
insertion loss over the required frequency ranges. In addition, procedure III (see 4.6.2.3.4) shall require apparatus
capable of applying a force to the cable component of the assembly while the body of the interface component is
rigidly supported.
4.6.2.3.1.2 Test conditions. Unless otherwise specified in the detail specification, the test shall be conducted
under room ambient conditions (see 4.3.1.1) and as specified herein. The insertion loss versus frequency shall be
plotted on rectangular coordinate graph paper 10 by 15 inches (10 divisions per inch) with precaution being taken to
insure that the plot is so positioned that both the 0 dB reference plot and the insertion loss plot are clearly legible.
The permanent records shall be calibrated and capable of differentiating an insertion loss change of 0.05 dB. The
measuring system response shall be such that an insertion loss variation of 1.0 dB with a frequency width as narrow
as 0.02 GHz will be displayed with degradation limited to less than 20 percent.
4.6.2.3.2 Procedure I (RF insertion loss). An appropriate test setup shall be assembled to measure the power
delivered to a load by a generator before and after insertion of the test sample. Precaution shall be taken to insure
that the reflected energy does not affect the output of the generator. (See 6.4.4).
4.6.2.3.2.1 Accept-reject criteria (procedure I). If the measured insertion loss is equal to, or less than, the value
specified in the detail specification, the assembly shall be considered to have passed the RF insertion loss test.
4.6.2.3.3 Procedure II (insertion loss uniformity). The RF insertion loss uniformity shall be determined by
measuring the fine structure variation (see 6.4.5) of the RF insertion loss. The permanent record obtained in
procedure I (see 4.6.2.3.2) shall be measured to determine the maximum value of fine structure variation within the
specified bandwidth.
4.6.2.3.3.1 Accept-reject criteria (procedure II). The assembly shall be considered to have failed the insertion loss
uniformity test if the assembly fails to meet the criteria specified in the detail specification.
4.6.2.3.4 Procedure III (insertion loss stability). The insertion loss stability test shall determine the integrity of the
junction between the cable and the interface components when they are subjected to side acting forces. This test
shall be conducted as follows:
a.
Mount the coaxial assembly with the input interface rigidly supported so the applied side acting forces are
not transmitted to the electrical interface between the test sample and the measurement system. Connect
the test sample in the measurement system.
b.
Perform an RF insertion loss measurement as specified in procedure I herein (see 4.6.2.3.2).
c.
Apply a force (numerically in pounds) equal to ten times the outside diameter of the cable component
(in inches) at a point whose distance (in inches) from the rear of the interface component equals two times
the outside diameter of the cable component. This force shall be applied perpendicular to the major axis of
the cable component via a 0.5 by 0.5 inch (13 by 13 mm) rigid flat steel plate.
d.
While the force specified in 4.6.2.3.4c is being applied, measure the RF insertion loss and record the
measurement on the same permanent records as specified in 4.6.2.3.4b.
e.
Measure three additional RF insertion losses while the force specified in 4.6.2.3.4c is being applied, except
apply the force in each of the three remaining quadrants. Record each measurement on a permanent
record as specified in 4.6.2.3.1.1. When the required measurements are completed, the permanent record
shall show 5 RF insertion loss measurement traces.
f.
Repeat procedures specified in 4.6.2.3.4a through 4.6.2.3.4e, except the other primary interface of the
coaxial assembly shall be used as the input.
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