 |
|
|
|
|
|
|
|
|
|
|
|
|
|
 |
|
||||||||||||
 |
 |
 |
 |
 |
 |
|
|||||||
 |
 |
 |
|
 |
 |
|
|||||||
ELECTRICAL CONTACTS
The electrical contact testing is performed to determine the reliability of equipment under various contacting conditions. A few types of electrical contact tests are: contact-chatter monitoring, contact resistance, intermediate, and low level contact switching.
CONTACT-CHATTER MONITORING
This test is conducted for the purpose of detecting contact-chatter in
electrical and electronic components having movable electrical contacts,
such as replays, switches, circuit breakers, etc. It is performed where
it is required that the contacts do not open or close momentarily, for
longer than a specified time-duration, under environmental test conditions,
such as vibration, shock, or acceleration.
Contact-chatter testing is specified in the following:
CONTACT RESISTANCE
The purpose of the contact-resistance test is to determine the resistance
offered to a flow of current during its passage between the electrical-contacting
surfaces of connecting components, such as plugs, jacks, connectors, and
sockets, or between the electrical contacts of current-controlling components,
such as switches, relays, and circuit breakers.
Contact resistance testing is specified in the following:
MIL-STD-202, MIL-J-641, MIL-E-2036, MIL-STD-3885, MIL-H-83511
INTERMEDIATE LEVEL CURRENT SWITCHING
This test is conducted for the purpose of determining the electrical contact
reliability of such items as electromechanical relays, switches, etc.,
under intermediate current switching conditions. An intermediate current
switching circuit is one in which there is insufficient voltage and stored
energy to cause contact arcing during opening or closing of mating contacts,
but which have sufficient energy to cause melting of the contact material.
Intermediate level current switching testing is specified in the following:
LOW LEVEL CONTACT SWITCHING
This test is conducted for the purpose of determining electrical contact
reliability under low-level switching conditions in the environment in
which the contacts operate. A low level switching circuit is one in which
the voltage and stored energy are sufficiently small so that the resistance
of a pair of contacts is not affected by electrical phenomena associated
with the electrical current flow or the switching.
Low level contact switching testing is specified in the following:
Home About Standards & Specs Equipment & Facilities Contact Related Links Articles Photos Videos ©2004 Aero Nav Laboratories Inc., All Rights Reserved 14-29 112th Street, College Point, NY 11356 Toll Free: 1-800-680-6608 Phone: 718-939-4422 Fax: 718-539-3719