MIL-PRF-26H
3.21.3 Ferrule-terminal resistors. The PIN, manufacturer's name or trademark, or both, the resistance value in
ohms, preceded by the abbreviation for "Resistance" and the power rating value in watts, followed by the abbreviation
for the word "Nominal", shall be marked on the periphery of the ferrules. Considering the resistors as mounted
vertically, the PIN and the manufacturer's name or trademark, or both, shall be marked on the lower ferrule and the
remaining information shall be marked on the upper ferrule, as shown in the following example:
Lower ferrule
RW16V161
Manufacturer's name or trademark, or both.
Upper ferrule
Res. 160
20 W. Nom.
All markings shall be approximately centered on a common longitudinal axis.
3.21.4 Beryllium oxide (BeO). Manufacturers that use beryllium oxide in their construction shall mark each resistor
body and resistor package with the symbol "BeO".
3.22 Soldering. Where soldering is employed, only noncorrosive flux shall be used unless it can be shown that
corrosive elements have been satisfactorily removed after soldering. Solder shall not be used for obtaining
mechanical strength. Electrical connections shall be mechanically secure before soldering and electrically continuous
after soldering. Except for solder used to coat terminals, the solder used shall in no case start to melt at a
O
temperature of less than 360 C, or at the maximum temperature reached when the resistor is operating at rated
wattage, whichever is higher.
3.23 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally
preferable materials should be used to the maximum extent possible provided that the material meets or exceeds the
operational and maintenance requirements, and promotes economically advantageous life cycle costs.
3.24 Workmanship. Resistors shall be manufactured and processed in a careful and workmanlike manner, in
accordance with good design and sound practice.
4. VERIFICATION
4.1 Classification of inspections. The inspections specified herein are classified as follows:
a.
Qualification inspection (see 4.4)
b.
Retention of qualification (see 4.5)
Conformance inspection (see 4.6)
c.
4.2. Test equipment and inspection facilities. The supplier shall establish and maintain a calibration system in
accordance with ISO 10012-1, NCSL Z540-1 or equivalent system as approved by the qualifying activity.
4.3 Inspection conditions and precautions.
4.3.1 Inspection conditions. Unless otherwise specified herein, all inspections shall be performed in accordance
4.3.2 Precautions. Adequate precautions shall be taken during inspection to prevent condensation of moisture on
resistors, except during moisture-resistance test.
4.4 Qualification. Qualification inspection shall be performed at a laboratory acceptable to the Government
(see 6.2) on sample units produced with equipment and procedures normally used in production.
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