MIL-DTL-28791C
3.5 Dielectric withstanding voltage (applicable to coaxial circulators only). When circulators are tested as
specified in 4.7.2, there shall be no evidence of breakdown.
3.6 Isolation. When isolators and circulators are tested as specified in 4.7.3, the isolation shall be as specified
(see 3.1).
3.7 Insertion loss. When isolators and circulators are tested as specified in 4.7.4, the insertion loss shall not
exceed the value specified (see 3.1).
3.8 Voltage standing wave ratio (VSWR). When isolators and circulators are tested as specified in 4.7.5, the
VSWR shall not exceed the value specified (see 3.1).
3.9 Shock (specified pulse). When isolators and circulators are tested as specified in 4.7.6, there shall be no
change in electrical or mechanical performance.
3.10 Thermal shock. When isolators and circulators are tested as specified in 4.7.7, there shall be no evidence of
damage or electrical degradation due to the test.
3.11 Moisture resistance. When isolators and circulators are tested as specified in 4.7.8, there shall be no change
in electrical or mechanical performance or destructive corrosion. Destructive corrosion shall be construed as any
type of corrosion which in any way interferes with electrical or mechanical performance.
3.12 Vibration, high frequency. When isolators and circulators are tested as specified in 4.7.9, there shall be no
change in electrical or mechanical performance.
3.13 Marking. Isolators and circulators shall be marked with the military part number, manufacturer s code and
numbers identifying each port (see 3.1). Marking shall be applied directly on the isolators or on an attached name
plate. Marking shall be in accordance with MIL-STD-1285.
3.14 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally
preferable materials should be used to the maximum extent possible provided that the material meets or exceeds the
operational and maintenance requirements, and promotes economically advantageous life cycle costs.
3.15 Workmanship. Isolators and circulators shall be processed in such a manner as to be uniform in quality and
shall be free from defects that affect life, serviceability, or appearance.
4. VALIDATION
4.1 Test equipment and inspection facilities. Test and measuring equipment and inspection facilities of sufficient
accuracy, quality, and quantity to permit performance of the required inspection shall be established and maintained
by the supplier. The establishment and maintenance of a calibration system to control the accuracy of the measuring
4.2 Classification of inspections. The inspections specified herein are classified as follows:
(a) Materials inspection (see 4.3).
(b) First article inspection (see 4.4).
(c) Conformance inspection (see 4.6).
4.3 Materials inspection. Materials inspection shall consist of certification supported by verifying data that the
materials listed in table I used in fabricating the isolator or the circulator are in accordance with the applicable
referenced specifications or requirements prior to such fabrication.
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