MIL-DTL-25955A
3.4.6 Design and construction, hermetic. The following exceptions and additions for class H
connectors apply to the design and construction requirements specified herein.
3.4.6.1 Hermetic contacts. Only pin contacts shall be employed in hermetic receptacles.
3.4.6.2 Hermetic contact terminations. Contact of wire terminations in hermetic connectors shall be of
the solder cup type as illustrated on figure 1.
3.4.6.3 Hermetic inserts. Inserts in hermetic connectors may be individually formed insulators around
each contact. The insulators may be sealed to and supported by a lattice type metallic structure running
throughout the insert face. The support structure may be a part of the shell. All performance
requirements applicable to the monoblock construction inserts shall apply unless specifically excepted.
3.4.6.4 Hermetic contact non-removal. Contacts in hermetic connectors shall not be removable for
assembly or maintenance purposes.
3.4.6.5 Hermetic terminal end. Cable adapters and clamp assemblies and wire sealing grommets shall
not be supplied as parts of hermetically sealed receptacles.
3.5 Maintenance and installation. The design and construction of the connectors shall be such that
assembly and disassembly of the connectors is possible for normal service installation or removal and
maintenance of contacts and wires without the use of any special tools other than those specified herein
(3.4.2.1, 3.7.3 and 4.6.15).
3.6 Performance characteristics. Connector's shall perform as follows when subjected to the
environments and tests specified.
3.6.1 Dielectric withstanding voltage, sea level. Disengaged connectors with grommets removed shall
show no evidence of breakdown when tested in accordance with 4.6.1 and when the applicable test
voltages of table I are applied between any two contacts and between the shell and any contact.
3.6.1.1 Dielectric withstanding voltage, altitude. Completely wired and grommeted connectors shall
show no evidence of breakdown when tested in accordance with 4.6.1.1 and under the following
conditions:
a.
Air pressure at 0.649 psia simulating 70,000' altitude (1.32 in Hg.).
b.
Test voltages as applicable in accordance with table I.
c.
Engaged or disengaged, as specified.
Ambient temperature at minus 55°C.
d.
TABLE I. Test voltages, vms, 60 cps.
Simulated
Sea level
Service
altitude
Engaged
Engaged
Disengaged
rating
after
after
ungrounded
Engaged
Disengaged
corrosion
immersion
1
1250
300
938
938
313
2
2400
600
1800
1800
600
3
3000
1500
2250
2250
750
10
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