MIL-DTL-87104C
4.6.1.6.4 Accept-reject criteria, (procedure VI). If there is any evidence of plated surface defects or foreign and
corrosive materials, the cable shall be considered to have failed the test.
4.6.2 Electrical tests.
4.6.2.1 Voltage standing wave ratio (VSWR) tests (see 3.5.1.2). The VSWR test procedures specified herein shall
be accomplished by either the slotted line, reflectometer, or swept slotted line method, requiring the following test
apparatus as applicable: a slotted line and related instrumentation, reflectometer setup, or a swept slotted line and
related instrumentation, and necessary termination.
4.6.2.1.1 Procedure I (VSWR engineering acceptance test). Procedure I shall determine VSWR engineering
acceptance of the equipment.
4.6.2.1.1.1 Test conditions. Test conditions for procedure I shall be those applicable to the method selected
(4.6.2.1.1.2, 4.6.2.1.1.3, or 4.6.2.1.1.4). The overall accuracy of the VSWR measuring device(s) shall be such that
the (absolute VSWR) = (measured VSWR) ± 0.08* (maximum specified VSWR - 1). (NOTE: *0.10 for frequencies
above 12 GHz). If the coaxial assembly being tested is a type B or type D assembly, the right angle connector shall
be considered the input end of the assembly.
4.6.2.1.1.2 Test method 1: Slotted line. When using the slotted line method, measurements shall be made at
frequency increments not greater than 0.01 GHz between 0.03 and 0.50 GHz, 0.025 GHz between 0.50 and 5 GHz,
0.05 GHz between 5 and 10 GHz, and 0.10 GHz above 10 GHz. The measured data shall be recorded on a
tabulation sheet or plotted on 8- by 10-inch graph paper.
4.6.2.1.1.3 Test method 2: Reflectometer. When using the reflectometer method for recording VSWR, a complete
curve shall be recorded by an X-Y recorder using 8- by 10-inch graph paper (10 by 10 to the inch). Calibration curves
that represent the maximum VSWR to be measured and the limits of the band of doubt (see 6.4.3) shall be plotted on
the graph paper. Curves shall be plotted with a limit of 1 octave per plot.
a.
VSWR calibration curves shall be plotted in increments of 0.1 between VSWR limits of 1.1:1 and 1.9:1, and
0.2 above a VSWR of 2:1 and grid markers along the horizontal axis to represent the following frequency
increments:
(1) 0.01-GHz increments between 0.03 and 0.50 GHz.
(2) 0.025-GHz increments between 0.50 and 5 GHz.
(3) 0.05-GHz increments between 5 and 10 GHz.
(4) 0.10-GHz increments above 10 GHz.
b.
Using the VSWR curves of 4.6.2.1.1.3.a, the VSWR shall be tabulated at the frequency increments
specified under 4.6.2.1.1.3.a.
c.
Prior to accomplishing VSWR measurements, the maximum VSWR calibration curve shall be rechecked to
insure repeatability of the curve. If values of VSWR are within the band of doubt, the VSWR shall be
measured using the slotted line method in sufficiently close increments to define a smooth curve structure,
but at increments not greater than those specified in 4.6.2.1.1.2; or the VSWR shall be measured by the
reflectometer method using the expanded reflectometer scale to define a curve, but the expanded curve
shall cover the entire paper (8 by 10 inches).
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