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Thermal shock (high and low temperature operation)
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Relays, Reed (Mercury Wetted) General Specification For
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Resistance to soldering heat (see 3.22)



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MIL-R-83407B
d. Measurements after cycling: Relays shall be visually examined for cracking, peeling, and flaking of the
finish. The dielectric withstanding voltage shall then be measured as specified in 4.5.3.
4.5.15 Shock (specified pulse) (nonoperating) (see 3.18). Relays shall be tested in accordance with method 213
of MIL-STD-202. The following details and exceptions apply:
a. Mounting method: Rigidly mounted by normal mounting means. (Relays designed without mounting
provisions shall be rigidly secured to a suitable nonmagnetic mounting plate by means of potting or adhesive
applied between the top of the relay and the mounting plate.)
b. Test condition: A, except peak value shall be 10 g's.
c. Electrical load conditions: The coil shall be deenergized and the contacts shall not be loaded or monitored
for chatter and closure.
d. Measurements and examinations after shock: Dielectric withstanding voltage, contact resistance, and
pickup and dropout voltages shall be measured as specified in 4.5.3, 4.5.8, and 4.5.6, respectively. Relays
shall then be examined for loosening of parts.
4.5.16 Vibration (nonoperating) (see 3.19). Relays shall be tested in accordance with method 204 of
MIL-STD-202. The contacts shall not be loaded or monitored for chatter or closure during vibration. The following
details apply:
a. Mounting: Same as 4.5.15a.
b. Test condition: A, except amplitude shall not exceed 5 g's and frequency range shall be 10 to 300 Hz.
c. Measurements: Same as 4.5.15d.
4.5.17 Moisture resistance (when specified) (see 3.1) (see 3.20). Relays shall be tested in accordance with
method 106 of MIL-STD-202. The following details and exceptions apply:
a. Mounting: On a corrosion-resistant panel by normal mounting means.
b. Initial measurement: Not applicable.
c. Loading voltage: Not applicable.
d. Final measurements: Upon completion of step 6 of the final cycle, insulation resistance shall be measured
as specified in 4.5.4. After a 24 hour drying period at a relative humidity of 50 5 percent, dielectric
withstanding voltage shall be measured as specified in 4.5.3, except that the test voltage shall be 90 percent
of the initial potential. The insulation resistance, contact resistance, and pickup and dropout voltages shall
be measured as specified in 4.5.4, 4.5.8, and 4.5.6, respectively.
e. Examination after test: Relays shall be examined for evidence of breaking, cracking, chipping, or flaking of
the finish, and loosening of the terminals.
4.5.18 Magnetic interference (see 3.21). The relay under test and eight similar relays shall be mounted in the
same physical orientation by nonmagnetic means, as shown in figure 4. Unless otherwise specified, grid-spaced
relays shall be mounted so that all terminals are positioned in the closest possible grid pattern. The spacing
between terminals and the tops of the adjacent terminals shall be as shown in figure 4, unless otherwise specified.
Pickup and dropout voltages (or current) shall be measured on the relay under test as specified in 4.5.6 with the
coils of the eight outer relays energized at rated voltage (the magnetic polarity of each relay shall be similarly
oriented) (see 6.4). This measurement shall be repeated with the coils of the eight outer relays deenergized.
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