1、MIL-T-2.53738 bb m 7777706 0333272 3 m 7 27 March 1961 Superseng Mu-T-25193A ( ASG) 4 Sept i956 MILITARY SPECIFICATION TRIWSMIIvrER, REMOTE COMPASS, TYPE C-2 (UNSTABILIZED) This specWication has been approved by the Bureau of Naval Weapons, Department of the Navy, 1, SCOPE unstabilized remote compas
2、s transmitter designated type (3-2. 1.1 This specifiaation covers one type of 2, APPLICABLE DOCZMEXCS publications, of the issue in effect on date of invitation for bids, form a part of this specification to the extent specified herein: 2,l The followhg specifications, standards, and SPECIFICATIONS
3、Military MIL-D-70327 - Drawings, Engineering and Associated Lists MIL-C-5541 and Aluminum Alloys WL-P-7936 Prepmation for, Deliaery MIL-s-6872 - Soldering Process, Cieneral Speclfication for MIL-S-7742 - Screw Thmads, Standard, Aeronaut Ica1 1-8625 - Anodic Coatings, for Aluminum and Aluminum Alloys
4、 MIL-P-116 - Preservation, method of - Chemical Films for Alwainum - Parts and Equipment, Aeronutical, STANDARDS Military MIL-STD-129 - Marking for Shipment and MIL-STD-130 - Identification Marking of Storage U. .S Military Property /- .is No. 405 - Storage Life - Aeronautical Use of Articles REQu-m
5、s Preproduction - The transrmtzer furnished under this 9 Piaterials - Metals - Metals shall be of the corrosion- resistant type or sh suitably protected to resist corro- sion during noml service life. Materials contained within hemetically sealed enclosures are considered to be suitably protected fr
6、om corrosion, Requirements specified for fungi- cidal and corrosion protective treatment, anodizing of the alumnum-alZoy parts and cadmium plating of steel parts are not applicable for parts within hemetically sealed instruments, Nonmagnetic materials -+Nonmagne.t;ic materi- als shall be used for al
7、i parts of th e compass transmitter, except where magnetic materials are essential, fungi mat be used, auch materials shall be treated with a fungi- cidal agent, as approved by the procuring activity, Protective tyeatment - When materials that are subject to corrosion in sait air or other atmospheri
8、o conditions likely to occur during service usage are used in the construction of the compass transmitter, they shall be protected Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-T-25173B bb 77777Ob 0133274 5 MU-T-25193B NEP I i)- 3.575 MAX DIA
9、4 L.781 MAX DIA 4 1.688 SPHJXCCAL RAD CENTER OF GRAyITY (LEVEL POSITION) X .- L1/8 WITH COMPENSATOR X = l-5/16 WITHOUT COMPENSATOR DIMENSIONS ARE IN INCHES. UNLESS OTHERWISE SPEGLFIED, TOURANCE: 2.016. FIGURE 1. TRANSMITTER, -C-5541 in lieu of anodizing. chemical films in accordance with Specificati
10、on MU-(2-5541 shall not be used in lieu f anodizing. 3.11.1.4 Castings containing non-aluminum-alloy 3.11.1.5 When abrasion resistance is a factor, 3.12 Performance - The transmitter-shall meet the performance requirements specified in section 4, when sub- jected to the applicable tests. 3*13 Identi
11、fication of product - The transmitter assembly, subassemblies, and parts shall b e marked for identifi- cation In accordance with Standard MIL-STD-130. 3.14 Workmanship - 3.14.1 General - The transmitter, including parts and accessories, shall be constructed and finished workmanlike manner. Particul
12、ar attention shall be given neatness and thoroughness of soldering, marking of parts assemblies, and freedom of parts from burrs and shvp- edkes. Pivots, bearings, and gears shall neither bind nor shake shall be as nearly frictionless as possible. all in a to and and 3.14.2 Dimensions - Dimensions a
13、nd tolerances not specified shall be as close as is oonsistent with the best shop practices. interchangeability, operation, or performance of the compass, they shall be held or limited accordingly, Where dimensions and tolerances may affect the 3.14.3 Screw assemblies - Assembly screws and bal-f;s s
14、hall be tight, cannot be appreciably tightened further without damage or injury to the screw or bolt OP threads, The word “ti ght “ means that the screw QI? bolt 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reprod
15、uction or networking permitted without license from IHS-,-,-MIL-T-25373B bb W 9?747b 0333277 4 m- 4.2.6 Standard signal transformer - All tests shall be conducted with a standard signal transformer desianed for this purpose. The aignal transformer shall consist of-a three-phase, three-wire stator su
16、rrounding a single-phase, two- wire rotor, The maximum input line-to-line impedance of the stator with normal rotor load shall be 133L8l0 ohms k10 percent of the magnitude and angle, when measured at 1,000 cps with a standard laboratory instrument, such as a General Radio Type 650-A impedance bridge
17、, OP equivalent. The rotor when properly tuned to the signal shall have a minimum output voltage of 625 millivolts when the line-to-line signal input voltage to the stator is 90 +io millivolts, at 800 cps, 4.2.6.1 The signal transformer shall be as free as possible from inherent transmission error,
18、in order that errors caused by its use in the compass direction signal will be kept to a minimum. 4,2,6,2 The signal transformer shall have a suitable dial, mounted concentric with its rotor shaft, and a suitable pointer on the shaft for determining angular displacement from O to 360 degrees of the
19、rotor to within IO.1 degree. with the transmitter mounted on a turntable, accurately cali- brated in increments of 15 degrees from 0 through 360 degrees. 4.2.7 Turntable - All tests shall be conducted 4.2.8 Standard null meter - The standard null meter shall consist of a high-input impedance device
20、which shall be capable of detecting the null-position of the rotor of the standard signal transformer to withln 20.1 degree, when the line-to-line signal voltage of 90 10 millivolts is applied to the stator, 4.3 Preproduction tests - 4.3.1 Sampling instructions - The preproduction test samples shall
21、 uonsist of three transmitters. and forwarded to the testing laboratory designated in the contraut or order. Samples shaU be identified as required 4.3.2 3WtS -Prepsoduotion tests shall consist of the tests specifieCrUnder-Acceptance tests and, in addition, the following test. /- 8 Provided by IHSNo
22、t for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T- 251 93B(WEPS) 4.3.2.1 Special vibration test - The transmitter shall be vibrated a% a frequency of 900 cpm with a total excur- sion of 0.125 inches in a horizontal plane, for a period of 100 hours. in such a mann
23、er that the zero index line on the transmitter flame is 45 degrees from tk direction of the vibration machine motion. The transmitter shall eben meet both the scale error test specified in 4.4.1.2 and the tilt error specified in 4.4.1.7. Acceptance tests - Acceptance tests shall consist of Individua
24、l tests and Sampling tests. Individual tests - Each transmitter shall be subjected to the following tests. Examination of product - Each transmitter shall be inspected Co determine conformance with this specifica- tion with respect to material andworkmanship. Scale error - The transmitter without co
25、m- pensator shall be mounted on a turntable in a normal position with standard field strength, and standard input voltage. The transmitter secondary circuit shall be connected to the stator of a standard signal transformer whose rotor is connected to a standard null meter. The transmitter and signal
26、 transformer shall be set at zero or “north“ heading (rotor at null position). The transmitter shall then be turned in heading-increments of 30 through 360 degrees. At each heading, the pointer of the signal transformer shall be turned correspondingly to its null position and the reading of the poin
27、ter on the dial taken. between the pointer reading and heading of the transmitter shall not exceed rl0.75 degree after the index error has been subtracted. without compensator shall be set at th e zero heading specified in 4.4.1.2, the Scale error test The compensator, with both north-south and east
28、-west screws set at neutral, shall then be placed in its normal position on the transmitter. The resulting shift of the null position of the signal transformer rotor shall not exceed Cl degree. This test shall be repeated with the transmitter set on the 90-degree heading. without compensator shall b
29、 e set at th e zero heading specified in 4.4.1.2, the Scale error test. north-south and east-west screws set at neutral shall be placed The transmitter shall be mounted on the vibration machine 4.4.1 4.4.1.1 4.4.1.2 The difference 4.4.1.3 Neutral position test - The transmitter 4.4 .i.4 Compensator
30、range test - Tkie,4xansmitter The compensator with both r /- y 9 t Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-25393B bb 9999906 0333282 4 = Y
31、 standard signal transformer. former shall be set at zero or “north“ heading. of synchronization null shall be determined by rotating the transmitter. from the transmitter heading and the maximum 800-cps voltage re- corded. The transmitter and signal trans- The signal transformer heading shall be di
32、splaced Then the heading This voltage shall be not less than 600 millivolts. 4.4.2 Sampling tests - Five transmitters shall be selected at random from each quantity of 500 or fraction thereof on the order and subjected to the following tests. transmitters may be tested at the same time. The five 4.4
33、.2.1 Low temperature test - The transmitter, while inoperative, shall be subjected to a temperature of -65F (-54C) for a period of 3 hours. operation while at this temperature, and resubjected to the Scale error test (see 4.4.1.2), except that the tolerance shall be il degree. The transmitter shall
34、show no signs of leakage. The ad.iusting screws on the compensator shall operate without excess The transmitter shall then be set into biking r excess freedom. 4.4.2.2 be operated for a period of 160“ (71C). After returnizg to room temperature, the trans- mitter shall meet the requirements of the Sc
35、ale error test (see 4.4.1.2) . The transmitter shall show no signs of leakage, and the adjusting screws on the compensator shall operate without excess binding or excess freedom. High temperature test - The transmitter shall hours at an ambient temperature of 4.4.2.3 Vibration endurance test - The t
36、ransmitter shall be vibrated at a frequency of 2,000 cpm, so that a point on its case describes approximately a circle of a diameter of 0,018 to 0.020 inch in a plane inclined at 45 degrees to the horizontal for a period of 3 hours. mitter shall not be damaged, nor shall the compensator setting be c
37、hanged. The cornpensator and trans- The transmitter shall then be resubjected to the Individual tests . 4.4.2.4 Vibration error test - The transmitter shall be vibrated as speciried in 4.4.2.3, the Vibration endurance test, except that it shall be operated wlth the signal transformer alined on the z
38、ero-degree heading before vibration. mitter shall then be vibrated at frequencies of 600, 800, 1,000, etc cpm through 2,500 cpm with an amplitude of .O03 to .O05 inch (see 6.2.1). the signal transformer rotor shall not exceed L1 degree from the normal heading. the east-west axis. headings not less t
39、han 100 degrees apart. The trans- At each frequency, the shift in null position of The plane of the circle of vibration shall contain This test shall be repeated on two other - 11 _. - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-253938 bb m
40、 3999906 0333283 b m MIL- T- 25193BwEPS) 4.4.2.5 Voltage-frequency variation test - The transmitter shall be set up as specified in 4.4.1.2, the Scale error test, with the signal transformer on the zero-degree heading. The supply voltage shall then be ieduced to 22 volts and the frequency to 360 cps
41、. The shift in null position of the signal transformer rotor shall not exceed and the faot that the Government my have formulated, furnished, or in any way supplied the said drawings, specifications, or other data, is not to be regarded by implication or otherwise as in any manner licensing the holder or any other person or corporation, or convsying any rights or permission to manufacture, use, or sell any patented invention that may in any way be relahd thereto. u Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
