 |
|||
|
Page Title:
Figure 8. Mounting arrays for adjacent similar relays |
|
||
| ||||||||||
|
|  MIL-R-5757H
FIGURE 8. Mounting arrays for adjacent similar relays.
4.6.16 Coil life (unless otherwise specified, see 3.1) (see 3.18). Relays shall be tested for 1,000 hours
as follows (see figure 9).
a. Relays may be mounted as specified in 4.2.5. Each contact terminal shall be connected as
specified in 4.6.8.1a.
b. During the maximum temperature portion of the test, rated coil voltage (or current) (see 3.1) shall
be applied continuously and at least half of the normally open contacts shall carry rated current.
During room temperature and minimum temperature exposures, the coil shall be de-energized
and contacts shall not be loaded. Ambient temperatures shall be varied as shown on figure 9,
with heating and cooling rates not to exceed +1C per second average. The portion of the cycle
run at minimum temperature shall be approximately 10 percent of the test cycle time.
c. After the first 100 hours, and while still at the low temperature extreme, static contact resistance
(or voltage drop) (4.6.8.1) and operate and release time (4.6.8.4) shall be measured as specified
and the value recorded. Measurements of coil resistance (or coil current as specified, see 3.1
and 4.6.8.3) and static contact resistance (4.6.8.1) shall be taken at room temperature initially,
then again after 250 hours 25 hours, 500 hours 25 hours, and 750 hours 25 hours and the
values shall be recorded. Specified pickup, hold, and dropout values (voltages) measurements
shall be made as specified in 4.6.8.2 during the last temperature cycle after allowing the relay to
stabilize, de-energized, at each of the temperature extremes, and the values shall be recorded.
33
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals