MIL-PRF-28776F
TABLE II. Qualification inspection - Continued.
Number of
Number of
Inspection
Requirement
Test
failures
sample units
paragraph
method
allowed
to be inspected
paragraph
Q4
4
1
Overload (highest dc resistive load)
Life (highest rated dc, 50,000 cycles) 4/
Dielectric withstanding voltage 3/
Insulation resistance 3/
Electrical characteristics 3/
Q5
See table III
Life 5/
Q6
4
1
Intermediate current
Dielectric withstanding voltage 3/
Insulation resistance 3/
Electrical characteristics 3/
Q7
4
1
Mechanical life
Dielectric withstanding voltage
Insulation resistance
Turn-on time and turn-off time
Visual inspection (external)
1/ One sample unit remaining unsealed shall be subjected to the internal inspection.
2/ Solderability samples are not subjected to dielectric withstanding voltage, insulation resistance, electrical
characteristics, and seal.
3/ Coil current may be done prior to dielectric withstanding voltage and insulation resistance. Testing sequence is
optional for insulation resistance and dielectric withstanding voltage prior to electrical characteristics. Turn-on
voltage (or current), see 3.1, and turn-off voltage may be done after coil transient suppression voltage.
4/ Post overload life testing requirements are not applicable to T0-5 and 0.100 grid pin style relays.
5/ The sample size shall be equally divided among the specified contact ratings and shall be of sufficient size to test
a minimum of one relay per contact rating with rated loads on all contacts. When there are more samples than
loads, the remaining loads shall be assigned in sequence beginning with the highest dc rated load.
4.5 Verification of qualification. Every 6 months the manufacturer shall provide verification of qualification to the
qualifying activity. Continuation of qualification is based on meeting the following requirements. Variables
measurements are acceptable.
a.
MIL-STD-790 program.
b.
The design of the relay has not been modified.
c.
The specification requirements for the item have not been amended so as to affect the character of the
item.
d.
Lot rejection for group A inspection does not exceed 10 percent or one lot, whichever is greater.
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