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|  MIL-R-19365D
3.4.2 Windings .
3.4.2.1 Wire. The wire shall have no joints, welds, or bonds, except at end terminals. The conductor
and insulation (if employed) shall be free as practicable from particles of impurities, grain growth, or other
factors contributing to spot weakness. The term wire will be throughout this specification to describe the
resistance elem ent.
3.4.2.2 Pitch. For round wire, the average winding pitch shall not exceed 300 percent of the wire
diameter.
3.4.2.3 Effective wire coverage. Effective wire coverage is the winding length on the tube between
points of departure from the normal winding pitch.
3.4.3 Terminals. Terminals shall be treated to facilitate soldering. They shall be firmly secured to the
tube and shall not be solely dependent on the protective coating for mechanical anchorage. All terminals
shall be so designed as to permit the secure crimping or hooking wire without depending upon soldering
for mechanical strength. They shall support the wire without deformity. All terminals shall be radically
straight and within 10 of a plane passing through one of the terminals and the longitudinal axis of the
resistor.
3.4.3.1 Adjustable terminals. Adjustable terminals shall make positive continuous contact with the
turns of the winding, and shall be designed for fastening securely in the desired position.
3.5 Threaded parts. Where applicable, all threaded parts shall be in accordance with Handbook H28.
3.6 Voltage rating. Resistors shall have a rated direct current (dc) continuous working voltage, or an
approximate sine wave root mean square (rms) continuous working voltage at commercial line frequency
and waveform corresponding to the power rating, as determined from the following formula:
E = PR
Where: E = rated dc or rms continuous working voltage.
P = power rating (see 3.1).
R = nominal resistance.
3.7 DC resistance.
3.7.1 Total. When resistors are measured as specified in 4.7.1.1, the total dc resistance shall be within
5 percent of the nominal resistance value (see 1.2.1.3.1 and 3.1).
3.7.2 Maximum engageable. When resistors are measured as specified in 4.7.1.2, the dc resistance
shall be within 20 percent of the value recorded in 3.7.1 for resistors of 2-inch nominal lengths or less,
and within 10 percent of the value recorded in 3.7.1 for resistors over 2 inch nominal lengths.
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