MIL-DTL-3971F
4.3.2 Classification of examinations and tests. Examinations and tests shall be performed on
a defect (individual characteristic) basis in accordance with ANSI/ASQC Z1.4 and the inspection
level and sampling plans specified in tables II and III. Examination and tests for packaging,
packing and marking shall be in accordance with section 5 and the contract or purchase order.
4.3.3 Workmanship. Quality of workmanship in conjunction with industry standard practices
shall be inspected at the discretion of the Government during in-process and on completed
meters to insure that meters are continually produced in accordance with 3.7.
4.4 Procedures.
4.4.1 Test equipment. Accuracy of the meter shall be determined by a mechanical, electric or
electronic time measuring instrument having a daily rate of ± 10 seconds per day.
4.4.2 Visual examination. The meter shall be examined visually for conformance to
workmanship and requirements as specified in tables I, II and III.
4.4.3 Mechanical examination. The meter shall be checked for conformance to dimensional
requirements.
4.4.4 Certification. Certification, when required herein, shall certify that the meter has been
determined to be in full compliance with the specified requirements and that workmanship and
materials conform with recognized standards of commercial quality. The certification shall
reference the contract or purchase order number and shall be signed by a responsible officer of
the contractor. The certificate shall contain the following statement: "as the authorized
representative of the contractor, the undersigned warrants and represents that all the information
supplied herewith is true and accurate."
4.4.5 Test conditions.
4.4.5.1 Atmospheric. Unless otherwise specified, the tests shall be performed at +23ºC ±
10ºC (73.4°F ± 18.0°F), at barometric pressure of 28 to 31 inches (711 to 787 mm) of mercury
and a maximum relative humidity of 80 percent.
4.4.5.2 Voltage and frequency. Unless otherwise specified, type I meters shall be tested, as
applicable, at 28 volts or 120 volts and type II meters shall be tested at rated voltage and
frequency as specified.
4.4.5.3 Temperature changes. Temperature changes, when required, shall be gradual to
reduce the possibility of thermal shock.
4.4.5.4 Accuracy. Unless otherwise specified meters shall be accurate within ± 1 percent of
total elapsed time during and following tests.
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