MIL-R-5757J
3.27.1 Interchangeability. All parts having the same military PIN shall be directly and completely interchangeable with each other with respect to installation and performance to the extent specified in the specification sheet (see
3.1).
3.28 Header glass. Header glass may have small irregularities, such as bubbles, chips, and cracks. The acceptability shall be based on figure 4 and the following:
a. Surface blisters whose diameters do not exceed one-half of the radial distance between the terminal and the corresponding header metal are acceptable (for a cluster of blisters, the overall cluster diameter shall apply).
b. Circumferential cracks which originate and terminate in the glass and which extend less than 135° are acceptable (see figure 4, reference B).
c. Radial cracks with lengths not exceeding three-quarters of the distance between the terminal and the surrounding header metal are acceptable (see figure 4, reference C).
d. Tangential cracks which are confined to a single zone are acceptable (see figure 4, reference D).
e. Meniscus cracks and chipouts which completely surround the terminal are acceptable if:
(1) The meniscus cracks and chipouts do not extend beyond one-half the distance from the terminal to the surrounding header metal, or
(2) The meniscus cracks and chipouts do not extend beyond one-quarter of the distance from the terminal to the surrounding header metal and a portion of the meniscus cracks and chipouts does not extend beyond three-quarters of the distance from the terminal to the surrounding header metal if that portion of the meniscus cracks and chipouts does not span more than 180° (see figure 4, reference E).
f. An internal bubble whose diameter does not exceed one-third the distance between the terminal and the surrounding header metal is acceptable.
Microscopic examination with up to 10X magnification shall be used. In case of dispute, all relays shall meet the applicable insulation resistance, dielectric withstanding voltage, and seal requirements, regardless of the acceptability of the header glass.
The above requirements are not applicable after group B and group C inspections.
3.29 Workmanship. The relays shall be fabricated in such a manner as to be uniform in quality, and shall be free from cracked or displaced parts, sharp edges, burrs, and other defects that will affect life, serviceability, and appearance.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
a. Qualification inspection (see 4.3).
b. Verification of qualification (see 4.4).
c. Conformance and periodic inspections (see 4.5).
4.2 Inspection conditions. Unless otherwise specified, all inspections shall be performed in accordance with the test conditions specified in the "GENERAL REQUIREMENTS" of MIL-STD-202. All inspections may be performed at ambient environmental conditions consistent with industry practice.
4.2.1 Power supply. Unless otherwise specified herein, the power supply shall have no more than 10 percent regulation at 110 percent of the specified test load current. A dc power supply shall have no more than 5 percent ripple voltage. An ac power supply shall be within 1 percent of the specified frequency and shall be sinusoidal with a form factor between 0.95 and 1.25.
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