MIL-DTL-28791C
4.6.2 Inspection of marking. The sampling and inspection of interior package marking shall be in accordance with
the group A and B conformance inspection requirements of MIL-STD-2073-1. The sampling and inspection of
marking for shipment and storage shall be in accordance with the quality assurance provisions of the applicable
container specification and the marking requirements of MIL-STD-129.
4.7 Methods of examination and test.
4.7.1 Visual and mechanical examination. Isolators and circulators shall be examined to verify that the materials,
design, construction, physical dimensions, marking and workmanship are in accordance with applicable requirements
(see 3.1).
4.7.2 Dielectric withstanding voltage (applicable to coaxial circulators only) (see 3.1 and 3.5). Circulators shall be
a. Special conditions:
1) The maximum relative humidity shall be 50 percent.
2) The voltage shall be metered on the high side of the transformer.
b. Magnitude of test voltage (see 3.1): The voltage shall be instantaneously applied.
c. Nature of potential: Alternating current.
d. Points of application of the test voltage: Between the center contact and the shell of the coaxial connector.
4.7.3 Isolation (see 3.6). [Isolators:] With the output port 2 of the test isolator connected to the input circuitry, and
the input port 1 connected to the output circuitry (see figure 1), the frequency range shall be swept and the isolation
measured. [Circulators:] With the input port 1 of the test circulator connected to the input circuitry, the output port 2
terminated with a matched load and the port 3 connected to the output circuitry (see figure 2), the frequency range
shall be swept and the insertion loss measured. This procedure shall be repeated for all circulator ports.
4.7.4 Insertion loss (see 3.7). [Isolators:] With the input port 1 of the test isolator connected to the input circuitry
and the output port 2 connected to the output circuitry (see figure 1), the frequency range shall be swept and the
insertion loss measured. [Circulators:] With the input port 1 of the circulator connected to the input circuitry, the
output port 2 connected to the output circuitry (see figure 2) and the port 3 terminated with a matched load, the
frequency range shall be swept and the insertion loss measured. This procedure shall be repeated for all circulator
ports.
4.7.5 Voltage standing wave ratio (VSWR) (see 3.8). [Isolators:] With the input port 1 of the test isolator
connected to the input circuitry and the output port 2 connected to the output circuitry (see figure 1), the frequency
range shall be swept and the input VSWR measured. Ports 1 and 2 shall be interchanged and the output VSWR
measured. [Circulators:] With the input port 1 of the circulator connected to the input circuitry, the output port 2 and
the port 3 terminated with a matched load, the frequency range shall be swept and the input VSWR measured. This
procedure shall be repeated for all circulator ports (see figure 2).
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