NAVY MIL-A-6752 A (3)-1958 AMMETERS VOLTMETERS AND LOADMETERS DIRECT CURRENT《直流电电流表电压表和载荷表》.pdf

1、 MIL-A-6752A(ASG) L AMENDMENT- 3 3 MARCH 1958 Superseding Amencinent -2 15 November 1955 MILITARY SPECIFICATION AMMETERS, VOLTMETERC, AND LOADIETEEJ DIRXCT CURRENT This amendment forms a part of Militarg Specification MIL-A-6752A(ASG), dated December 1953, and has been approved by the Department of

2、the Air Force and by the Navy mau of Aeronautics. Page 1, paragraph 2.1: Urder SpecFficatiom add the follcwiilg: “MIL-L-25l42 Luminescent Material, Fluorescent“ Delete the followings “Air Force-Navy Aeronautical kv-L-1 Luminescent Material ; Fluorescent“ Under Stardards in the title of n14S25025n de

3、lete “Type J-l“, and standards : add the following Numrals and Letters, Aircraft Instrument Dial, Stardard Form of Shunts, Iristnimerrt, External, 9-Millivolt, style BA Shunts, Instiument, Externai., !%Millivolt, Style MSB Shunts, Instrument, External, 9-Millivolt, Style K3Cn Under Air Force-Navg Ae

4、ronautical Stardard Drawings delete I the followirg : “AN3200 AND10400 Shunt-Ammter, External, 50 Hillivolt Numeras and Letters - Aircraft Iristnunent Dial, Stardard Form ofn Page 2, paragraph 3.3.4: Page 3, paragraph 3.3.11: othenrise specified.“ Page 3, paragraph 3.3.4; at 9 millivolta with a shun

5、t lead msistance of 0.5 ohm in series with the meter. meters shall be adjusted to provide the 1.0 mading at 50 ndllivolts and shunt lead resistance of 0.5 ohm. The shunt shall conform to Standards b591586, MS91587, arid IS91588“. In the last line delete “AN-L-1“ ard substitute 11MIL-L-251b2.n Add th

6、e following at the end,of the first sentence Delete, and sutetitute the following piragrapir “unless “3.3.14 Adjustment.- The ameters shall be adjusted ta provide full-scale reading Load- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-6752A (3

7、) 66 7777706 045Lbil5 il 9 Page 4, paragraph 3.9, “Tmperatum influence is the charge (percentage of fill-scale value) in the indication cased by a Wference in ambient temperature af fiOC from a reference temperature.“ Page 5, paragraph 3.18: Page 5, paragraph 3.19: “mounting screw“. Page 5, paragrap

8、h 3.21.1: “Standard M533558n . Page 5, paragraph 3.2l.lilt in the last line delete “AN-L-ln ami substitute MMIL-L-25l42. Page 5, paragraph 3.21.2: Delete, an substitute the following paragr: marked on the back of each ammetere Add the followirig sentence to emi of paragraph: I Delete the paragraph 1

9、; its entire, In the secad lhe delete “insert nut“ and substitute In the second Xine delete nDrawirg AND104OOn and substitute “3.21.2 The follow note in letters of 0.075 ineh minimum height shall be USE WITH 50 Mp SHUNT“ Page 8, FEGURE 3: (a) (b) Add the following note: Delete the nunierala “-.ln an

10、d “1.25“ from ule diel, “I6 PART NUMBER MAY HS PLACm ON EITHm DIAL OR ON BE MASK.“ (c) in the table after nMNOR GRADS“, delete n0.031n and “0.0s“ arid substitute “0.062“ and nO.OIOn, respectively. Page U, paragraph 4.3.1s Page U, paragraph 4.3.3; “applicablen. Page 12, paragraphs 4.5.5 and 4.5.5.1s

11、reference tenperature of 25 %?T. (apprcaimately equidistant) on the scale, such readings to inelude the madmim scale value. The meter shall then be subjected to a temperature 20% above the reference tenperature for not less than 2 ham, until thermal stability is attained, and the readings repeated.

12、The same procedure shall be repeated at a temerature 20% belar the refereme temperature. temperature and the corresponding readirig at the reference tempfmzxre shll be expressed as a percentage of full-scale value. at the low tenperature. not equal, the greater value shd.1 be considered the temperat

13、ure influence. Page 4, paragraph 4.5.4: Page 14, paragraph 4.5.15: subs titute nmounting hole“. I I Add “, as applicablen immediately foloung “teste“. In the third line between “then arad “tests“ add the word Delete, and substituter “4.5.5 Temperahire influence.- Meter readings shall be taken with t

14、he meter at a Readings shall be taken at not less than five points One-half of the difference between each mading at the high A similar coaiputation shall be made for the readings If the influemes above axxi belaw the reference temperature are (See 3.9.)“ I Delete the paragraph in Its entirety. In the fourth line delete “hole h the mounting nut“ and Custodians: Navy - Bureau of Aeronautics Air Force 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-