MIL-PRF-22684 Resistors, Fixed, Film \(Insulated\) General Specification ForThis specification covers the general requirements for insulated, film, fixed resistors of 2- and 5- percent resistance tolerance. These resistors are capable of full-load operation at an ambient temperature of 70 degrees C and have a resistance-temperature characteristic of +200 parts per million per degree Celsius \(ppm/degrees C\), \(see 6.1\). Designers are CAUTIONED on using these resistors in high power pulse applications \(see 6.10\).

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MIL-PRF-22684F

3.19 Vibration, high frequency. When resistors are tested as specified in 4.6.14, the resistors shall meet the

following requirements:

Change shall not exceed �(0.5 percent +0.05 ohm).

DC resistance:

Electrical discontinuity:

0.1 millisecond or greater duration during the test.

Visual examination:

There shall be no evidence of mechanical or electrical damage.

3.20 Solderability. When resistors are tested as specified in 4.6.15, the dipped surface of the leads shall be at

least 95-percent covered with a new solder coating. The remaining 5-percent of the lead surface shall show only small

pinholes or voids; these shall not be concentrated in one area. Bare base metal and areas where the solder dip failed

to cover the original coating are indications of poor solderability, and shall be cause for failure. In case of dispute, the

percent of coverage with pinholes or voids shall be determined by actual measurements of these areas, as compared

to the total area.

3.21 Resistance to solvents (applicable to alpha-numeric marking). When tested as specified in 4.6.16, there shall

be no evidence of mechanical damage and the markings shall remain legible.

3.22 Marking. Resistors shall be legibly and permanently color coded in accordance with appendix B or as

specified (see 3.1).

3.23 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally

preferred 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. Networks shall be processed in such a manner as to be uniform in quality and shall meet the

requirements of 3.3 to 3.4.3, and 3.22 inclusive, and be free from other defects that will affect life, serviceability, or

appearance.

4. VERIFICATION

4.1 Classification of inspections. The inspections specified herein are classified as follows:

a. Qualification inspection (see 4.4).

b. Conformance inspection (see 4.5).

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 Conditions. Unless otherwise specified herein, all inspections shall be performed in accordance with the test

4.3.2 Precautions. Adequate precautions shall be taken during inspection to prevent condensation of moisture on

resistors, except during the low-temperature operation, thermal shock, and moisture-resistance tests. Precautions

shall also be taken to prevent damage by heat when soldering resistor leads to terminals.

4.4 Qualification inspection. 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. The number of sample units comprising a sample of resistors to be submitted for qualification

inspection shall be as specified in appendix A to this specification.