MIL-DTL-55041F
6.4 Definitions. For the purpose of this specification, the following definitions apply:
6.4.1 Dropout voltage. The dropout voltage is defined as the minimum operating voltage at which the switch
returns to the deenergized position.
6.4.2 Fail-safe switch. A fail-safe switch is defined as a switch with an actuator that contains a spring return
mechanism that provides RF connection to one selected position when no dc or ac voltage is applied to the switch.
This type of switch requires continuous voltage to maintain RF connection to any other position.
6.4.3 Holding current. The holding current is defined as the current required to hold the switch in position after the
RF contacts have completely transferred.
6.4.4 Indicating circuit. An indicating circuit is a circuit that remotely indicates the switch position. This is normally
done with indicator lights. The indicating circuit is a set of contacts controlled by the same shaft as the RF switch.
6.4.5 Latching switch. A latching switch is defined as a switch that contains a mechanism, either mechanical or
magnetic, that will maintain a chosen RF position. This is with or without voltage being maintained after the switching
action is completed.
6.4.6 Pull-in voltage. The pull-in voltage is defined as the minimum operating voltage at which the switch contacts
assume the energized position.
6.4.7 Rotor motion delay. The rotor motion delay is defined as the time between application of the switching
voltage and the beginning of rotor motion.
6.4.8 Switching time. The switching time is defined as beginning when the dc operating voltage is first applied and
ending when the switch RF signal reaches its steady-state value. Switching time consists of the following time
elements:
a.
Inductive delay time in the actuator coil.
b.
Transfer time of the RF contacts.
c.
Bounce time of the RF contacts.
6.4.9 Transfer switch. A transfer switch is defined as a switch with four-port and provides two independent pairs of
RF paths. These pairs are actuated simultaneously.
6.4.10 Operating current. The operating current is that current required for satisfactory operation of the switch.
The value of the current is normally specified for operation at room ambient temperature.
6.4.11 Interlock circuits. An interlock circuit is designed into a latching type of switch. The switch will remain in the
last position, until the switch is re-energized.
6.4.12 Fungus inert. Use guideline 4 of MIL-HDBK-454 for guidance in determining compliance with requirements
that switches use fungus inert materials in construction.
6.5 Occupational Safety and Health Administration (OSHA). OSHA review completed; no further review required.
6.6 Cleaning and drying. Waveguide switches should be cleaned in accordance with MIL-STD-2073-1.
Waveguide switches should be dried in accordance with MIL-STD-2073-1. Contact preservatives should not be
used.
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