1、MIL-D-3813!IA bb l 0b 0337857 5 l Fflo/-qi MIL-D-38134A (UiF) 20 May 1971 Superseding 14 June 1963 MIL-D-38134 (USAF) MILITARY SPECIFICATION DETECTOR , MAGNETIC AZIMUTH DSU-4/A , HIGH TEMPERATURE 1. SCOPE 1.1 designated DSU-4/A. 2. APPLICABLE DO(SUMENTS 2.1 The following documents, of the issue in e
2、ffect on date of invitation for bids or request for. proposal, form a part of this Specification to the extent specified herein: Specifications Federa 1 QQ-P-416 Plating, Cadmium (Electrodeposited) PP -B - 60 1 PP -B -63 6 Military MIL -P- 116 Preservation. Methods of This specification covers the r
3、equirements for a magnetic azimuth detector, Boxes , Wood , Clea ted-Plywood Box, Fiberboard MIL-s-4473 MIL-C-5541 MIL-S -7 742 Shielding, Magnetron Tubes and Magnets for Air Shipment Chemical Films and Chemical Film Materials for Aluminum and Aluminum Alloy Screw Threads, Standard, Optimum Selected
4、 Series: General Specifi- cation for Anodic Coatings, for Aluminum and Aluminum Alloys Wire, Electric , Fluorocarbon-Insulated, Copper and Copper Alloy Calibrator Set , Magnetic Compass, Type A/E37T-10 MIL -A - 8 65 MIL -W -2275 9 MIL-C-26524 Standards Military MIL- STD - 100 MIL-STD-130 MIL -STD -
5、143 MIL-STD-454 Engineering Drawing Practices Identification marking of US Military Property Standards and Specifications, Order of Precedence for the Selection of Standard General Requirements for Electronic Equipment FSC 6605 Provided by IHSNot for ResaleNo reproduction or networking permitted wit
6、hout license from IHS-,-,-MIL-DL38134A (WAF) MIL -STD-47 1 MIL-STD-781 MIL-STD-794 MIL-STD-810 MIL-STD-831 MIL -STD- 118 6 MS24264 MS24266 Ma in tainabi li ty Demonstra t ion Reliability Tests, Exponential Distribution Parts and Equipment, Procedures for Packaging and Packing of Environmental Test M
7、ethods Test Reports, Preparation of Cushioning, Anchoring, Bracing, Blocking, and Waterproofing, with Appropriate Test Methods Connector, Receptacle, Electrical Flange Mount, Miniature Connector , Plug, Electrical - Straight, Miniature (Copies of documents required by suppliers in-connection with sp
8、ecific procure- ment functions should be obtained from the procuring activity or as directed by the contracting officer.) 3. REQUIREMENTS 3.1 Qualification. The detectors furnished under this specification shall be products that are qualified for listing on the applicable Qualified Products List at
9、the time set for opening of bids (see 4.4 and 6.5). 3.2 Components. The detector shall consist of the following: a. Transmitter, Induction TRU-79/A b. Compensator, Electronic MW394/A 3.3 Selection of standards and specifications. Standards and specifications for necessary commodities and services no
10、t specified herein shall be selected in accordance with MIL-STD-143. 3 4 Materials 3.4.1 Metals. Metals shall be of the. cor-osion-resistant type or suitably treated to resist corrosion due to fuels, salt spray, or atmospheric condition% .encountered in storage or normal seryice. the high temperatur
11、es specified herein. Metals shall also withstand 3.4.2 Nonmagnetic materialst Nonmagnetic materials shall be used for all parts of the transmitter except where magnetic materials are essential. 3.4.3 Core material. The material for the magnetic core of the transmitter shall be such that it will. wit
12、hstand the maximum operating temperature specified herein plus the temperature rise due to heat dissipation from the electrical circuitry, without permanently altering the magnetic properties of the material. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from I
13、HS-,-,-3.4.5 Fungus-proof materials. Materials that are nutrients for fungi shall not be used .qhere it is practicable to avoid them. sealed, noninert materials shall be treated with a fungicidal agent acceptable to the procuring activity. However, if these materials are used in a hermetically seale
14、d inclosure, fungicidal treatment will not be necessary. 3.4.6 Protctive treatment. When materials are used in the construction of the detector that are subject to corrosion in salt air or other atmospheric conditions likely to occur during service usage, they shall be protected against such corrosi
15、on in a manner that will in no way prevent compliance with the performance requirements of this specification. Protective coatings that will crack, chip, or scale with age or extremes of atmospheric conditions shall not be used. 3.5 Design and construction. The detector shall be suitable for use wit
16、h the A/E37T-IO magnetic compass calibrator set conforming to MIL-C-26524. Where used and not hermetically 3.5.1 Transmitter. The transmitter shall conform to figure 1. It shall provide a minimum of 10 index error removal for either top or bottom mounting. When properly energized in the earths magne
17、tic field, the transmitter shall provide the indicator signal transformer with the proper direction signal for the compass system. The three secondary signal coils shall be internally Y-connected with the neutral point made externally available (see figure 2). The secondary coils leg-to-leg inductan
18、ce when measured at 1,000 cycles with a standard laborator-y instrument (such as a General Radio type 650-A impedance bridge or equivalent) shall be 92 110 millihenries and the d-c resistance shall be 30 I3 ohms, When the primary coil is excited at 23.5V 400 Hz, the signal frequency of the secondary
19、 coils shall be 800 Hz and the impedance shall be between 500 and 800 ohms at an angle between 60“ and 70“. secondary coils (leg-to-leg) shall be between 270 and 330 ohms at an angle between 72“ and 88“ at the 800-Hz signal frequency. The transmitter shall not become magnetized either by the presenc
20、e of strong magnetic fields or by a d-c current passing through the secondary coils. 3.5.1.1 Mechanism. The transmitter mechanism shall be mounted pendulously with respect to the case. The corresponding impedance of the 3.5.1.2 Pendulous element. The earth inductor shall be mounted on a pendulous el
21、ement so that it will tend to be horizontal when at rest. shall have at least 30“ of freedom in pitch and at least 10“ of freedom in roll with respect to the case. The pendulous element shall have a time period of not less than 0.2 second nor more than 0.75 :econd. error shall be 11.25 at a tilt ang
22、le of +15 The pendulous element The maximum permissible scale in pitch or 110“ in roll. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-D-38134A bb M 779790b 01378b0 5 ,166 WIDE TAP THRU 4 REQD (TO ALLOW ATTACHMENT OF TELESCOPE SUPPORT i PLATE
23、) MILLD-38134A (USAF) .I 12-40-UNC 38 3 SLOTS .I66 WIDE7 I. CON N CTOR MS24266R 12T12P I I* I TRANSMITTE-R - I4 TOLERANCE : + 0.005 NOTEI AT THE OPTION OF THE PROCURING ACTIVITY, THE TWO AFT HOLES FOR ATTACHMENT OF THE SUPPORT PLATE MAY BE LOCATED ON A 3.812 f.O.003 DIAMETER AT loo i5RADIALS ON EACH
24、 SIDE OF THE FORE-AFT CENTERLINE. FIGURE 1. TRU-79/A Transmimr 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL -D- 381 34A (USAF) REMOTE COM PENSATOR I TRANSMITTER r FIGURE 2. INTERCONNECTIONS 5 . I. Provided by IHSNot for ResaleNo reproduction
25、 or networking permitted without license from IHS-,-,- - flIL-D-3L34A bb W 77777Ob OL37b2 7 _ MIL -D - 38 134A (USAF) 3.5.1.2.1 Damping. element, when the pendulous element is made to swing from any position up to its maximum degree of freedom, Fluidetype damping shall be used to stabilize the pendu
26、lous The damping system shall permit not more than 12 oscillations to occur 3.5.1.3 Sealinn The. transmitter shall be hermetically sealed to prevent leakage of the damping fluid. 3.5.2 Compensator 3.5.2.1 General design. The compensator shall be designed for mounting remotely from the transmitter. I
27、nterconnection between the compensator and transmitter shall be as shown on figure 2. The degree of compensation specified herein shall apply for ineerconnecting lead lengths between the compensator and trans- mitter of up to 200 feet of No, 22 wire. The compensator shall incorporate two screwdriver
28、 slot-type adjustments by means of which it shall be possible to compensate for errors in the heading signal produced in the transmitter. One adjustment shall be capable of compensating for north-south signal transmitter errors and shall be labeled N-S and the other adjustment shall be capable of co
29、mpensating for east-west transmitter errors and shall be labeled E-W, The compensator shall conform to figure 3. 3.5.2.2 With both the N-S and E-W adjustments set on their neutral positions, the-Gmpensator shall not change the heading signal produced by the transmitter by more than 1“ upon removal o
30、r reinsertion of the compensator into the transmitter circuitry. eu tral Dosition influence. 3.5.2.3 Compensator range. With the transmitter set on O“ heading, the N-S adjustment shallbe capable of changing the output signal by 54“ to +6“ for the first +360“ rotation of the N-S adjustment from its n
31、eutral position. An additional 360“ rotation of Che N-S adjustment in the same direction shall deflect the output signal at least 9“ from the neutral position. With the transmitter setting on go“, the E-IJ heading shell be capable of changing the output signal by L-4“ to +6“ for the first k36Oo rota
32、tion of the E-W adjustment from the neutral position. An additional 360“ rotation of the E-W adjustment in the same direction shall deflect the output signal to at least 9“ from the neutral position, A clockwise rotation of each adjustment as specified above shall cause an increase in the resultant
33、heading signal, 3.5.2.4 Compensator adjustment interference. A 360 rotation of the E-W adjustment screw shall not inluence the transmitter output signal by more than 10.5 when it is set at O“ heading. on the N-S adjustment shall not influence the transmitter output signal hy more than fQ.5“. When se
34、t at 99“ heading, a rotation of 360 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-D-38134A (USAF) ADJUSTMENT SLOT 2 REOD INDEX MARKS 0.125 LONG 0.020 WIDE COLOR.; WHITE 0.170 DIA 2 HOLES t B3 I .I25 MAX LETTERS 1/4 HIGH COLOR; WHITE LETTERS 5
35、/32 HIGH COLOR WHITE w MS24264R12T12PNX I CONNECTOR PANEL CUTOUT, r2.812 20.0 Il CORNER RADIUS PANEL FACE COLOR; BLACK 0.06 to 0.09 TYP 2.312 2 0.01 DIMENSIONS IN INCHES. UNLESS OTHERWISE SPECIFIED, TOLERANCES: f OiO05 MAX FIGURE 3 MXU-394/A COMPENSATOR 7 Provided by IHSNot for ResaleNo reproduction
36、 or networking permitted without license from IHS-,-,-VIL-D-3L34A bb 979790b OL37b4 2 3.5.3 Reliability, criterion. The detector shall have a minimum acceptable mean-time-between- failures (MTBF) of 1,500 hours at a 90 percent confidence level. be considered as leakage or any malfunction which relul
37、ts in degraded perfor- mance regardless a the cause (careless handling or involuntary destruction excepted). Reliability of the detector shall be a major design Failure shall 3.5.3.1 Longevity. The detector shal.have a service life (longevity as defined in MIL-STD-781) of 5,000 hours before wearout
38、failures occur or the equipment consistently fails to meet the specified MTBF). within thfs period of time and the normal operating period of such parts shall be reported by the contractor to the procuring activity. Parts requiring replacement 3.5.4 Maintainability, The mean corrective maintenance d
39、owntime (Met) shall be 100 minutes not including the time required to unseal and reseal the detector and the maximum corrective maintenance downtime (Mctmax) shall be not more than 300 minutes including the time required to unseal and reseal the detector. 3.6 Performance, herein after subjection to
40、the between 150“ and 200C shall be within k0.8“ of true heading; and between -55“ and -30C shall be within a1.25“ of true heading. 3.6.11 Sensitivity. With the transmitter set to the O“ or north heading and the signal transformer set to a heading of 90“ f0.05“ greater than the transmitter, a current
41、 application of 1.07 50.05 ma from pins 1 to 6 shall result in a null indication on the signal transformer output. 3.6.12 Crosstalk error (180“). When the transmitter is set at the O“ or north heading, a current application of 2.14 50.1 ma dc from pin 1 to 6 shall generate a 180“ electrical heading.
42、 The error at this heading shall not differ from the corresponding scale error at 180“ by more than f0.8“. 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I MIL-D-38134A(USAF) -. a current application of 1.2 fO.l ma dc from pin 2 to pin 3 shall gen
43、erate a 270“ electrical heading, corresponding scale error at 270“ by more than 0.8“. I The error at this heading shall not differ from the I facturers-part number shall be functionally and dimensionally interchangeable. The item identification and part number requirements of MIL-STD-100 shall gover
44、n the manufacturers part numbers and changes thereto. I I 3.8 Power 3.8.1 Input. Excitation for the primary circuit of the detector shall be 23.5 I2,OV 400 e40-H single-phase a-c power, 3.8.2 Output. The 800-Hz signal output from the transmifter secondary circuit shall be transmitted over a 3-wire l
45、ine so that it may be connected to the stator of the signal transformer, 1-3 detector legs shall be recorded. then be rotated to the 30“ heading (null position), The voltage across the 1-2 leg shall increase and across the 1-3 leg shall decrease. With the transmitter still on the 30“ heading, the si
46、gnal transformer shall be rotated to the 120“ heading. The line-to-line voltage across the 1-2 leg shall be 140 f25 mv. The transmitter and signal transformer shall 3.10 Electric soldering. Electric soldering shall be in accordance with MIL-STD- I 454, requirement 5. sliprings, brushes, and rotary c
47、ontacts) shall be as nearly frictionless as possible except where friction is required. 3.12 Finishes and protective coatings 3.12.1 Aluminum-alloy parts. film canforming to MIL-A-8625, except as follows: 3.12.1.1 Small holes and case inserts need not b anodized. 3.12.1.2 with a chemical film in acc
48、ordance with MIL-C-5541. Aluminum parts shail be covered with an anodic Aluminum alloys which do not anodize sat2sfactorily shall be coated Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-D-38134A (USAF) 3.12.1.3 Where the primary purpose of the
49、treatment is to afford a suitable paint base, chemical. treatments in accordance with MIL-(2-5541 may be used in lieu of anodizing. 3.12.1.4 with a chemical film i.n accordance with MIL-C-5541 in lieu of anodizing. Castings containing nonaluminum-alloy integral inserts may be treated 3.12.1.5 When abrasion resistance is a factor, chemical film in accordance wit
