MIL-DTL-19648E
4.7.10.1 Acceleration test 1.
a. Relays shall be mounted on the test centrifuge by normal mounting means.
b. Relays shall be subjected to constant acceleration of the value specified (see 3.1) in both directions
along each of three mutually perpendicular axes, one of which shall be parallel to the direction of
contact motion.
c. The acceleration shall be increased from zero to the specified value in approximately 2 minutes and
held at the maximum for 2 minutes in both the unenergized and the energized conditions.
d. A neon light or other suitable indicator shall be connected across the contacts during the entire test
to determine the ability of the relay contacts to remain in the proper position.
e. Ambient temperature shall be 25°C ±5°C.
f. During test, in both directions along each of three mutually perpendicular axes, operate time with
rated heater input voltage shall be measured. At end of test, normal operate time shall be measured
(see 4.7.3.2).
4.7.10.2 Acceleration test 2. Relays shall be tested as specified in 4.7.10.1a thru 4.7.10.1e. In
addition, the following shall apply:
a. Normal heater voltage shall be applied for 15 times rated operate time plus 5 minutes before
application of acceleration and during testing. Continuity of each contact shall be continuously monitored.
After the test, normal operate time shall be measured as specified in 4.7.3.2.
4.7.11 Overvoltage (see 3.14). Relay heaters shall be energized at room temperature for 8 hours at
110 percent of rated operating voltage. Normal operating time shall be measured before and after test.
At end of test, normal operate time tolerance shall be increased by 5 percent.
4.7.12 Vibration (see 3.15). The relays shall be subjected to the applicable test specified in table VIII.
At end of test, normal operate time tolerance shall meet the requirements of 3.6.2.1.2.
TABLE VIII. Vibration test.
Level
Test paragraph
Frequency range
Method
1
4.7.12.1
10 - 55 Hz
201 of MIL-STD-202
2
4.7.12.2
10 - 500 Hz
204 of MIL-STD-202, condition A
3
4.7.12.3
10 - 2000 Hz
204 of MIL-STD-202, condition B
4
4.7.12.4
10 - 2000 Hz
204 of MIL-STD-202, condition D
4.7.12.1 Level 1. The following details and exceptions shall apply:
a. Relays shall be rigidly mounted by their normal mounting means. Plug-in units shall be firmly held
in mating socket.
b. Contacts shall be monitored in accordance with method 310 of MIL-STD-202, test circuit A. The
contacts shall be monitored for chatter during the entire test.
c. Relays shall be energized for the first 60 minutes and unenergized for last 60 minutes.
18
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business