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MIL-DTL-27190C

3.4.6 Voltage and frequency variation. The indicator shall withstand voltage and

frequency variations from 22 V to 30 V and 320 cps to 480 cps without exceeding the scale error

and friction tolerances specified in tables II and III.

3.4.7 Effect of lead length. When the lead length between the indicator and transmitter

is changed from 5 feet to 500 feet, the indication shall not change more than 1 degree of arc.

The ground lead shall be kept short.

3.4.8 Magnetic effect. The compass deflection shall not exceed 3 degrees of arc when

the indicator is positioned 5-1/2 inches from the compass and the horizontal magnetic field

intensity at the indicator is 0.17 oersted to 0.19 oersted.

3.4.9 Unit torque gradient. The unit torque gradient shall be a minimum of

2,000 milligram-millimeters per angular degree of rotation.

3.4.10 Radio noise interference. The indicator shall meet the radio noise interference

requirements of MIL-STD-461.

3.5 Part numbering of interchangeable parts. All parts having the same manufacturer's

part number shall be functionally and dimensionally interchangeable. The item identification

and part number requirements of ASME Y14.100 shall govern the manufacturer's part numbers

and changes thereto.

3.6 Finishes and protective coatings.

3.6.1 Aluminum alloy parts. Aluminum alloy parts shall be coated with an anodic film

conforming to MIL-A-8625 except that small holes, straight threads, case inserts, and parts in

hermetically sealed enclosures need not be anodized.

3.6.1.1 Resistance to anodizing. Aluminum alloy parts that do not anodize satisfactorily

shall be coated with a chemical film conforming to MIL-DTL-5541.

3.6.1.2 Abrasion resistance. When abrasion resistance is a factor, chemical films in

accordance with MIL-DTL-5541 shall not be used in lieu of anodizing.

3.7 Weight. The weight of the indicator shall not exceed 0.50 pound.

3.8 Screw threads. Unless otherwise specified (see 6.2), the threads of all machine screws

shall conform to MIL-S-7742.

3.9 Identification of product. Equipment, assemblies, and parts shall be marked for

identification in accordance with MIL-STD-130.

3.9.1 Nameplate. A nameplate shall be permanently attached to the rear of the case. Where

applicable, the information marked on the nameplate shall conform to MIL-STD-130. The

nameplate shall not be glued or cemented to the case nor shall metal decals be used except with

prior approval by the procuring activity.