MIL-M-23167B(SHIPS)
4.3.12 Dielectric stress. When performing this test, meters with nonmetallic cases shall be mounted on a metallic panel. All meters shall be subjected to a voltage of 2,600 volts r.m.s. applied between all external live parts of the meter and:
(a) The metallic platform or panel on which the meter is placed or mounted, or the meter case, if the case is metallic.
(b) The zero-adjuster; and range selector switch, when applicable. (c) All exposed metal parts not a live part of the meter.
4.3.12.1 The voltage shall be nominal 60 Hz in frequency and shall approximate, as closely as possible, a true sine wave in form. The voltage shall be applied continuously for a period of 60 seconds. The test voltage shall be measured by the voltmeter method whereby the measuring meter derives its voltage from the high-potential circuit, either directly or by means of a voltmeter coil placed in the testing transformer or by means of an auxiliary ratio transformer. To avoid voltage surges, the applied voltage shall be raised to its full value gradually, and upon completion of the 60-second test period shall be gradually reduced. The test shall be made using high-potential test prods having not less than 1/8 inch radius tips. There shall
be no signs of damage or flashover.
# 4.3.13 Insulation resistance. Meters shall be placed on a metallic platform or mounted on a metallic panel as specified in 4.3.12. Using a potential of 500 volts direct current, the insulation resistance shall be determined between all external live parts and the metallic platform or panel on which the meter is placed or mounted, or the meter case, if the case is metallic (see 3.16).
# 4.3.14 Vibration. Frequency meters shall be subjected to vibration in accordance with type I of MIL-STD-
167.
4.3.15 Shock (high-impact). Frequency meters shall be subjected to high-impact shock tests in accordance with type C of MIL-S-901 for lightweight equipment when mounted on a plate as shown on fixture 6D-1 as shown
on figure 7-1 of MIL-S-901. Both test samples shall be subjected to the test. During the test, one frequency meter shall be energized to the center-scale value. The pointer may be reset to zero after each blow. At the completion of the test, the meters shall be checked for calibration errors (see table I).
# 4.3.16 Harmonic content. Voltage containing harmonic-frequency energy shall be applied to the meters as follows:
(a) Fundamental (of nominal voltage rating) plus 3 percent each harmonic, 2nd through 20th, in turn. (b) Same as (a), except 4 percent harmonic content.
(c) Same as (a), except 5 percent harmonic content.
4.4 Quality conformance inspection. Each meter shall be subjected to the examination and tests specified in table V. Examination and tests shall be conducted in the order listed. Frequency meters which do not meet requirements specified herein shall be rejected.
Table V - Quality conformance inspection.
Examination and tests |
Requirement paragraph |
Examination and test paragraph |
Visual and mechanical examination (without opening case) Initial accuracy Temperature range Voltage range Insulation resistance Dielectric stress |
--- 3.5 3.11 3.7 3.16 3.15 |
4.3.2 4.3.4 4.3.11 4.3.7 4.3.13 4.3.12 |
4.5 Inspection of preparation for delivery. Packaging, packing and marking of packages shall be inspected to determine conformance with the requirements of section 5 herein.
# 5. PREPARATION FOR DELIVERY
(The preparation for delivery requirements specified herein apply only for direct Government procurements. For the extent of applicability of the preparation for delivery requirements of referenced documents listed in section 2, see 6.4.)
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