MIL-DTL-16034B
4.2.1.2 Conformance inspections. Unless otherwise specified herein, all conformance inspections shall be
performed at ambient temperature of 20 °C to 30 °C, at existing barometric pressure, and with relative humidity less
than 80 percent.
4.2.2 Reference temperature. The reference temperature shall be 25 °C.
4.2.3 Position. Unless otherwise specified herein, tests performed on meters, including all tests requiring scale
readings, shall be performed with the meter in the position in which it is normally used.
4.2.4 Examination of pivots and bearings. Examination of pivots and bearings for evidence of corrosion and
damage from vibration, shock, and other tests, shall be made through a microscope having a magnification of 40 to
100 diameters.
4.2.5 Tapping. When taking meter readings, either the meter or its support shall be tapped lightly, except when
ascertaining the effect of friction after the vibration test.
4.2.6 Parallax. The effect of parallax shall be avoided when taking meter readings.
4.2.7 Resetting to zero. Unless otherwise specified herein, meters provided with an external zero-adjuster may be
set to zero at the completion of each test.
4.2.8 Thermal stability. For all tests, thermal stability shall be obtained at the specified temperature prior to
reading the meters.
4.2.9 Number of scale readings.
4.2.9.1 Switchboard meters. Unless otherwise specified herein, readings on switchboard meters shall be taken at
six approximately equidistant points on the scale, including the zero and end-scale readings.
4.2.9.2 Portable meters. On single-range portable meters, readings shall be taken at each numbered cardinal scale
mark. On multiple-range portable meters, readings shall be taken at each numbered cardinal scale mark for one range
only; on other ranges, readings shall be taken at five or more approximately equidistant points on the scale, including
the zero and end-scale readings.
4.2.10 Standard meters. Standard meters shall be used to check the indications of meters submitted for test.
Accuracies and tolerances specified are absolute, and readings of standard meters should be corrected before
determining compliance.
4.3 Qualification inspection.
4.3.1 Samples. Sample meters submitted for qualification approval shall be representative of the manufacturer's
normal production and shall be taken, preferably, from a current production lot. The type designation and number of
specimens required to be submitted for each kind of meter shall be as specified in tables I and II, as applicable.
Sample meters, which are used with external shunts, shall be supplied with shunt leads of 0.065±0.010-ohm resistance
for switchboard meters and 0.026±0.005-ohm resistance for portable meters. Where 400- and 800-cycle meters are
similar in basic construction to the submitted 60-cycle meter, only one additional specimen of each type is required.
All qualification tests shall be performed on this specimen except the tests for external-field influence, vibration,
humidity resistance, and shock (high-impact). If the basic design is different, a full number of specimens shall be
submitted, and all qualification tests shall be performed.
4.3.2 Test routine. Sample meters shall be subjected to the applicable qualification tests shown in table III, in the
order listed.
4.3.3 Failures.
4.3.3.1 Switchboard meters. One failure will be permitted on a sample of switchboard meters under the following
conditions:
a.
The failure is limited to one of the following tests:
(1) Position influence (balance)
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