MIL-DTL-15109D
4.5.11.1.2 Rheostats. Standard mounting for bulkhead mounted equipment type A test lightweight equipment
figure of MIL-S-901 shall be used for bulkhead mounted rheostats. Standard mounting for electrical indicating
switchboard instruments and other panel mounted equipment type C test light weight equipment figure of MIL-S-901
shall be used for switchboard mounted rheostats. Figure 1, herein, shall be used for double end mounted, multiplate
rheostats.
4.5.11.2 Definition of failure. Definition of failure shall be as follows:
a. Breakage or appreciable distortion of any parts, including mounting bolts.
b. Mechanical malfunctioning of rheostats. Movement of the contact arm more than 10 percent of its total travel
in any one blow when tested with the contact arm in any intermediate position.
c. Low insulation resistance. After shock tests, the insulation resistance shall conform 3.5.4.
d. Low dielectric strength. After shock tests, the dielectric test shall be conducted at a voltage (equal to 65
percent of the voltage required by 4.5.13).
e. Failure to pass inspection. Following checks (a) through (d), the equipment shall be disassembled to the
point necessary to ascertain its condition and examined for damage. Any observed effects of the shock shall
be recorded.
4.5.12 Insulation resistance. Insulation resistance shall be as specified in 3.5.5. The measurement shall be made
with an insulation-resistance-indicating meter with a full scale reading of 100 or 200 megohms, an open circuit
voltage of 500 volts and a voltage of at least 450 volts across a resistance of 1 megohm. The temperature shall be
measured and recorded. Insulation resistance tests shall be made after the device has cooled to room temperature
and as soon as practicable after completion of electric life and vibration tests. The relative humidity shall be
measured and recorded.
4.5.13 Dielectric. Dielectric tests shall be conducted in accordance with NEMA ICS 1. The tests shall be made
upon the completely assembled items after completion of all tests except the shock test.
4.7 Inspection of packaging. Sample packages and packs, and the inspection of the preservation, packing and
marking for shipment and storage shall be in accordance with the requirements of section 5 and the documents
specified therein.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order
(see 6.2). When actual packaging of materiel is to be performed by DOD personnel, these personnel need to contact
the responsible packaging activity to ascertain requisite packaging requirements. Packaging requirements are
maintained by the Inventory Control Point's packaging activity within the Military Department or Defense Agency, or
within the Military Department's System Command. Packaging data retrieval is available from the managing Military
Departments or Defense Agency's automated packaging files, CD-ROM products, or by contacting the responsible
packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.
6.1 Intended use. The class HI resistors and rheostats are intended for use for Naval shipboard service.
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