1、MIL-V-28728A 67 E 7777906 0356223 4 E F.- 3 b -SC, /- /-36-b r. 8 MIL-V-28928A (MC) 3 December 197 1 SUPERSEDING MIL-V-28928 (MC) 10 June 1969 MILITARY SPEC I FICAT ION VIEWER-PRINTER : PORTABLE 1. SCOPE 1.1 This specification covers the requirements for one type portable viewer-printer. 2. APPLICAB
2、LE DOCUMENTS *2.1 The following documents of the issue in effect on the date of invitation for bids or request for proposal, form a part of the specification to the extent specified - herein. SPECIFICATIONS FEDERAL TT -E-48 5 PPP-B-60 1 PPP-B-621 MILITARY MIL-P-3684 MIL-F-1407 2 STANDARDS MILITARY M
3、IL-STD-129 MIL-STD-150 MIL-STD-8 10 MIL-STD-1186, Enamel, Semi -Glos s , Rust -1nhibi t i ng . BOX, Wood, Cleated-Plywood. Box, Wood, Nailed And Lock-Corner. Printing, Duplicating, And Book Binding Equipment, Packaging Of. Finish For Ground Signal Equipment. Marking For Shipment And Storage. Photogr
4、aphic Lenses. Environmental Test Methods. Cushioning, Anchoring, Bracing, Blocking, And Waterproofing, With Appropriate Test Methods. . -. . . .- - . . . . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-(Copies of specifications and standards requir
5、ed by suppliers in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer.) 2.2 Other wblications. The following documents form a part of this specification to the extent specified herein. Unless otherwise indicated, th
6、e issue in effect on the date of invitation for bids or request for proposal shall apply OFFICIAL CLASSIFICATION COMMITTEE Uniform Freight Classification Rules (Application for copies should be addressed to the Official Classification Committee, 1 Park Avenue at 33rd Street, New York, N. Y., 10016.)
7、 AMERICAN TRUCKING ASSOCIATION National Motor Freight Classification Rules (Application for copies should be addressed to the American Trucking Association, 1616 lipii Street, N. W.; Washington, D. C. 20036.) 3 . REQUIREMENT S 3.1 First article. Unless otherwise specified (see 6.2), before productio
8、n is commenced, a first article shall be submitted or made available to the contracting officer or his authorized representative for approval in accordance with 4.3. commencement of production, but does not relieve the supplier of responsibility for compliance with all provisions of this specificati
9、on. The first article shall be manufactured in the same facilities to be used for the manufacture of the production item. 3.2 Materials. Materials shall be as specified herein. Materials not definitely specified shall be in accordance with good commercial quality for the intended purpose. Materials
10、shall be moisture resistant and flame retardant and materials which provide a nutrient medium for fungus shall not be used. Approval of the first article authorizes the 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-V-272A 67 m 7777706 035622
11、5 m MIL-V-28928A (MC) 3.2.1 Metal. The metals shall be lightweight, corrosion resistant, or suitably treated to resist corrosion, in atmospheric conditions to which the viewer-printer will be subjected when in storage or during service in the arctic, temperate, or tropic zones. Dissimilar metals, wh
12、ere used together, shall be suitably protected against electrolytic corrosion. “3.3 Desian and construction. The portable viewer-printer shall be a self-contained single unit suitable for carrying by two men. When set up for use, the panels and flush doors shall open to expose the retractable film s
13、pool pivots, film threading chamber, viewing screen, print processor, control panel and electrical power input receptacles. Closing of the panels and doors shall make the unit dusttight and easy to transport. When closed for transportation, the unit with its flush sides shall have the appearance of
14、a small trunk or footlocker, with a handle on each end for hand carrying. The unit shall meet the functional characteristics of this specification. The design shall include, but not necessarily be limited to the following: (a) Provisions for handling 35-millimeter (mm) strips and rolls of aerial fil
15、m in lengths up to 250 feet. Film loading access shall be from the front of the unit. (b) Viewing of a 35-nun photographic negative at enlargement on a 9 by 9 inch illuminated 8X tl0 percent viewing screen in full room light or daylight. Viewing screen brightness uniformity shall be within 50 percen
16、t of the on-axis illumination level in the open gate condition. On-axis illumination at the 8X. magnification shall be a minimum of 125 foot lamberts. (c) A positive print of the negative being viewed shall be made quickly and conveniently from a roll of photographic paper in a lighttight cassette u
17、nder daylight conditions. The print shall exhibit an axial resolution of 64 lines/rrun referred to the short conjugate at the 8X magnification. (d) A lighttight heat processor shall be provided with roller assembly and drive for daylight operation. 3 .- i I. ;i Provided by IHSNot for ResaleNo reprod
18、uction or networking permitted without license from IHS-,-,-*3,3.1 Components. The viewer-printer shall consist of the following major components: puantitv Description Print processor Film spool pivot assembly Control panel assembly Projection lens and filter assembly Film gate assembly Blower unit
19、Projection lamp assembly Roll paper cassette 1 2 1 1 Viewing screen assembly 1 1 1 1 1 *3.3.1,1 Alternate cornmnents, Components offered as equivalent fo components specified herein as a specific manufacturers part number or equal shall be functionally equal, of equal or better quality, with the man
20、ufacturers part number identified, The incorporation of a substitute component in the design of the viewer-printer shall not require modification or change to any other component, and shall not reduce ease of maintenance to it or any other components unless approved by the contracting officer. 3.3.1
21、,2 Pluu-in cornmnents. To facilitate maintenance, miniaturized, replaceable, packaged components shall be utilized in the electrical assemblies of the viewer-printer, except where it is mutually agreed that a greater reliability and superior service life would result from a permanently wired constru
22、ction. “3.3.2 Print Drocessor. The print processor shall be a lighttight unit consisting of a roller assembly, drive mechanism and heating element capable of developing dry-silver photographic materials (such as the 3M type 774 papers), structure shall contain an alignment chute to facilitate quick,
23、 accurate and positive insertion of the roll paper cassette into the processor, The print processor or its surrounding 4 I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-*3.3.3 Film smol Divot assemblies. The film spool pivot They shall fit into a s
24、pace within assemblies shall be retractable mechanisms with sliding arms and crank handles, the instrument and be completely contained within the portable configuration when the cover panels are closed. be as follows. *3.3.4 Controls. Controls for the viewer-printer shall *3.3.4.1 Control panel. The
25、 control panel shall include the following controls, switches and indicators for functions as indicated: Controls, switches and indicators Platen Knob, Up-Down Develop time knob Lens focus lever Print Exposure Timer Power Switch Assembly View Switch Assembly, Display Print Expose Switch Assembly, Di
26、splay Print Process Switch Assembly, Display Functions Move to up position to release glass platen when film is being wound through the film gate to down position to hold film flat for viewing or printing. A variable control which adjusts development time of print from 8 seconds to 4 minutes. Focuse
27、s image on viewing screen, . Exposes film for required time. Range: 1 to 30 seconds. On-off switch which energizes the entire unit. On-off switch which turns on projection lamp and illuminates viewing screen, On-off switch which automatically exposes the paper for printing. On-off switch which turns
28、 on the processor roller assembly. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-28928A (MC) Controls, switches and indicators Functions Platen Down Indicator Red warning lamp, indicating Lamp Assembly, Display glass platen is in down posit
29、ion on the film. Selector Switch I/ Selects the desired input power of either 120 v-Olt (V) alternating current (ac) or 244 direct current (dc). _-. u The location of the selector switch shall be next to the input power line cerd receptacle at the rear of cabinet housing. *3.3.42 Developina temperat
30、ure control. The developing temperature control shall be an internal adjustment in a location which is not readily accessible. shall adjust the processing temperature from 180F to 280F. This control *3.3.5 Viewina screen assemblv. The viewing screen assembly shall consist of a frame assembly, with a
31、 9-by 9-inch, Polacoat, or equal, screen. A hinged mechanism shall be provided to permit the screen to be raised for insertion of the roll paper cassette. mirror shall be installed at a 45O angle in the hinged hood above the viewing screen to permit observation of the enlarged negative as it is proj
32、ected on the screen. A stainless steel “3.3.6 Projection lens assemblv. The projection lens assembly shall consist of an f/4, 50-mm focal length lens * conforming to MIL-STD-150, with focusing provision. *3.3.7 Film aate assemblv. The film gate assembly shall The platen shall consist of a main frame
33、 containing the glass platen, its associated linkage and a warning microswitch. shall be readily removable for cleaning. be controlled by the platen knob. shall be provided by the “platen down* indicator to prevent winding of the film through the film gate when the glass platen is pressing it flat.
34、This assembly A red warning light 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-t MIL-V-2872A 67 7779706 OL5b227 5 m MIL-V-28928A (E) 3.3.8 Blower unit. A blower unit shall be provided to cool the projection lamp and housing so that no film damag
35、e shall occur during prolonged viewing. it shall cool the housing sufficiently.so that it shall not be uncomfortable to the touch. The blower unit shall be capable of removal for maintenance. In addition, *3.3.9 Proiection lamp assemblv. The projection lamp assembly shall consist of a 250-watt lamp
36、which shall be used for both viewing and printing. This lamp shall be controlled by the view switch assembly, through the appropriate voltage limiting circuitry and relay interlocks. The print exposure timer, and its associated print exposure switch assembly, shall be integral with the electrical co
37、ntrol of the lamp. When the view switch has turned off the projection lamp, it shall be controllable by the print exposure timer. When the print exposure switch is actuated, the projection lamp shall light up and automatically shut off after the time duration set on the timer has passed. be provided
38、 to preclude the necessity of a darkroom when dry silver photo paper is used. The cassette shall hold 50 feet of 9-1/2-inch-wide photo paper. a removable cap to facilitate loading the paper. retractable slide shall be provided to permit convenient opening prior to print exposure and easy closure imm
39、ediately thereafter. of the cassette to hold the paper flat, cassette shall contain a specially designed indicating device to enable the operator to determine that the copy paper is being fed into the processor. Storage of the paper cassette shall be within the viewer-printer when not in use. - *3.3
40、.10 Roll DaEr cassette. A roll paper cassette shall It shall contain A Guide channels shall be provided in each side The roll paper 3.4 Reliabilitv. The viewer-printer shall be designed to meet an expected life of 8 hours per day for 5 years minimum, except for bulb replacement. 3.5 Maintainabilitv.
41、 Adjustments, minor repairs and replacement of parts shall be executed by service-type operating personnel. 3.6 Transxxirtabilitv. The viewer-printer shall withstand operation and storage as a jeep transportable unit. 7 ,- i i Provided by IHSNot for ResaleNo reproduction or networking permitted with
42、out license from IHS-,-,-MIL-V-28728A b7 m 7777706 0156230 L = v 3.7 Performance characteristics. Performance of the viewer-printer shall be as follows. 3.7.1 Environmental conditions. The viewer-printer shall perform under the following environmental conditions: a) (b) *3.7.2 Operating. Ambient tem
43、perature +lOC to +32OC Ambient barometric Sea level to 10,000 Ambient relative Maximum controlled pressure feet humidity humidityIto80 percent Nonoperating. Ambient temperature -5OOC to +70OC Ambient barometric Sea level to 40,000 pressure feet Mechanical. The viewer-printer shall meet the mechanica
44、l conditions in 4.5.1. 3.7.3 Electrical. The viewer-printer shall operate from either an ac or dc source of power within the following ranges: (a) Potential and phase. 120 V, 60 hertz (Hz) single (b) Power requirements. 500 watts nominal, single The phase, three-wire, grounded neutral, ac or 24 V dc
45、. phase power, 120 V, 60 Hz, or 24 V dc. Separate line cords shall be provided for either ac or dc power. ac line cord shall have astandard U-ground plug and mate with a Hubbell, No. 7556,or equal, twist lock flush base, . 3-wire male receptacle. Bendix No. 1O-42628-51Pl or equa1,connector with prot
46、ective casing and mate with a Hubbell, No. 7467,or equal, twist lock flush base, 2-wire polarized male receptacle. The dc line cord shall have a (c) Fluctuation in potential shall have a voltage regulation of 25 percent no load to full load. (d) Frequency regulation shall be 25 percent no load to fu
47、ll load. 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I MIL-V-28928A (MC) *3.8 Dimensions. The viewer-printer shall be a self-contained single unit, 22 inches long by 16 inches wide by 13 inches high (excluding leveling legs) . *3.9 Weiaht. The
48、viewer-printer shall not exceed 80 pounds in weight . 3.10 Finish and color. Unless otherwise specified (see 6.2), finish shall be in accordance with MIL-F-14072, type I. After finishing, the viewer-printer shall be painted with enamel conforming to TT-E-485; color shall match Marine Corps green, No
49、. 23 (see 6.3). 3.11 Workmanship. The methods and techniques of workmanship . used in the fabrication and assembly of parts, subassemblies and assemblies shall be consistent with recognized and accepted standards for high grade quality manufacturing of electrical and electronic equipment and shall be in accordance with current state-of-the-art. The requirements of this specification shall not prohibit
