MIL-DTL-3971F
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified
as follows:
a. Qualification inspection (see 4.2).
b. Conformance inspection (see 4.3).
4.2 Qualification inspection. Qualification inspection of meters shall be in conformance with
the qualification tests listed in table I for the types and grades as specified.
TABLE I. Qualification inspection.
Requirement paragraph
Method paragraph
Inspection or Test
Materials
3.3
4.4.4
Coils
3.4.9
4.4.4
Mechanical
3.4.1
4.4.3
Weight
3.4.13
4.4.6.14
Visual
3.4.2 thru 3.4.8, 3.6, 3.7
4.4.2
4.4.6.1
Insulation resistance
3.4.10
Electromagnetic compatibility
3.4.11
4.4.6.2
Dielectric strength
3.4.12
4.4.6.3
Starting and stopping
3.5.1
4.4.6.4
Operating position
3.5.2
4.4.6.5
Vibration
3.5.3
4.4.6.6
Shock
3.5.4
4.4.6.7
Temperature cycling
3.5.5
4.4.6.8
Moisture resistance
3.5.6
4.4.6.9
Salt spray
3.5.7
4.4.6.10
Power supply tolerance
3.5.8
4.4.6.11
Water resistance
3.5.9
4.4.6.12
Long term accuracy
3.5.10
4.4.6.13
4.2.1 Samples. Four meters shall be subjected to qualification inspections. The samples
shall be representative of the meters produced under order or contract.
4.2.2 Failure. Failure of any sample meter to pass all the inspections or tests listed in table I
is cause for rejection of all samples submitted for qualification at one time.
4.3 Conformance inspection. Conformance inspections shall be in accordance with the
inspections and tests listed in tables II and III.
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