MIL-DTL-16034B
3.5.2 Magnets. If laminated or multiple-piece magnets are used, the laminations or components shall be
securely fastened together so that they will not separate or loosen as a result of tests specified herein.
3.5.3 Threaded parts. All threaded parts shall be in accordance with FED-STD-H28. Whenever practicable, all
threads shall be in conformity with the coarse-thread series. The fine-thread series shall be used only for
applications that might show a definite advantage through their use.
3.5.3.1 Bolts, nuts, and machine screws. All bolts, nuts, and machine screws shall conform to MIL-DTL-1222
or FF-S-200, and FF-S-210, as applicable.
3.5.3.2 Locking of screw-thread assemblies. When practicable, split-type lock washers or equivalent means
shall be provided under all nuts.
3.6 Design and construction of component parts.
3.6.1 Cases. Meter cases shall be made of molded thermosetting plastic material, metal, or other material as
specified herein. The cases shall be designed and constructed with close-fitting joints to minimize the entrance of
moisture. The dimensions of switchboard meter cases shall be as specified in the specification sheets (see 3.1).
3.6.1.1 Portable meters. Portable meters shall be contained in a substantial case of hardwood, molded
thermosetting plastic material, or metal. The case shall be provided with durable supporting feet and a suitable
carrying handle. The container for meters of 0.25 percent accuracy class shall be provided with a hinged cover and
a snap catch. Where an auxiliary carrying case is supplied for a portable meter, it shall be acceptable to the bureau
or agency concerned.
3.6.1.2 Finish.
3.6.1.2.1 Switchboard. The portion of the case exposed to view from the front of the panel shall have a light
gray finish in accordance with formula number 111, Class 2 of MIL-DTL-15090. No nickel or other bright
trimmings shall be used. Metal cases shall be rendered resistant to corrosion prior to the application of the final gray
finish.
3.6.1.2.2 Portable. All metal fitting and trimmings shall be protected against corrosion. Wooden cases shall
have a durable semitransparent finish, such as varnish. Metal or plastic cases shall have a durable black finish on
the exposed portion.
3.6.1.3 Certificate. Portable meters of 0.25 percent accuracy class shall be provided with a certificate covered
with clear transparent plastic and attached to the case in a conspicuous place. The certificate shall be signed by a
person authorized by the manufacturer and shall contain the following minimum information:
a.
Manufacturer's name
b.
Type or model
c.
Serial number
d.
Date of calibration
e.
Temperature correction
f.
Accuracy classification
g.
Resistance of each winding
h.
Inductance of each winding of meters designed for both 60-cycle AC measurements (AD meters)
3.6.1.4 Window. Meters shall be provided with a window of glass and, when specified (see 6.2), exterior
surfaces of windows shall be treated or coated to reduce glare. Windows shall be secured by clamps or other means,
or cover and window may be one homogeneous unit.
3.6.1.4.1 Scale visibility.
3.6.1.4.1.1 Switchboard meters. The scale and window shall be so designed that when the dial is vertical the
entire scale of the meter can be easily read at any angle up to 45 degrees below the horizontal centerline on the
vertical centerline, and 20 degrees to either side of the vertical centerline on the horizontal centerline, with general
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