MIL-PRF-22E
3.19 Marking. Resistors shall be permanently marked with the PIN and manufacturer s name and or trademark. If
space permits, the resistance value shall also be marked. The PIN shall be marked on either the rear or the
periphery of the resistors. There shall be no space between symbols which comprise the PIN. If lack of space
requires it, the PIN may be set in two lines. In this event, the PIN shall be divided between the document number and
the dash number as shown in the following example:
M22/01
-00012SB
3.20 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.
3.21 Workmanship. Resistors shall be processed in such a manner as to be uniform in quality and shall be free
from other defects that will affect life, serviceability, or appearance.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
a.
Qualification inspection (see 4.4).
b.
Conformance inspection (see 4.6).
4.2 Test equipment and inspection facilities. The manufacturer shall establish and maintain a calibration system in
accordance with NCSL Z540-1, ISO 10012-1, 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 in accordance with the test
4.3.2 Precautions. Adequate precautions shall be taken during inspection to prevent condensation of moisture on
resistors. Precautions shall also be taken to prevent damage by heat when soldering resistor leads to terminals.
4.4 Qualification. Qualification inspection shall be performed at a laboratory acceptable to the Government
(see 6.3) on sample units produced with equipment and procedures normally used in production.
4.4.1 Sample size. The number of sample units comprising a sample of resistors to be subjected for qualification
inspection shall be as specified in the appendix to this specification.
4.4.2 Inspection routine. Sample units shall be subjected to the qualification inspection specified in table IV, in the
order shown. Twenty units shall be subjected to the inspection of group I. The sample units shall then be divided as
specified in table IV for groups II to VI, inclusive as applicable, and subjected to the inspection for their particular
group, and as follows: For group II, three sample units of the highest nominal resistance value and one sample unit
of the applicable lower nominal total resistance value (see table A-I), for group III, three sample units of the highest
nominal resistance value and one sample unit of the applicable lower nominal total resistance value (see table A-I),
for group IV, two sample units of the highest nominal resistance value and two sample units of the applicable lower
nominal total resistance value (see table A-I), for group V, as applicable, four sample units of the highest nominal
resistance value; and four sample units of any resistance value (see table A-I), for group VI four samples of any
resistance value. For locking bushing type resistors submitted with standard bushing resistors, the four additional
sample units will be subjected to the examinations and test of group I and II of table V.
4.4.3 Defective. Failure of a resistor in one or more tests of a group shall be charged as a single failure. One
failure shall be allowed for groups I, II, III, and IV combined. No failures shall be allowed for groups V, and VI.
Failures in excess of those allowed shall be cause for refusal to grant qualification.
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