1、INCH-POUNDMIL-DTL-19595D (OS)11 February 2003SUPERSEDINGMIL-M-19595C (OS)02 August 1978DETAIL SPECIFICATIONMAGNETIC EFFECT LIMITS FOR NONMAGNETIC EQUIPMENT USED IN THEPROXIMITY OF MAGNETIC INFLUENCE ORDNANCEThis specification is approved for use by the Naval Sea Systems Command (OS), and is availabl
2、e for useby all Departments and Agencies of the Department of Defense.1. SCOPE1.1 Scope. This specification covers the magnetic effect limits and testing methods for nonmagneticequipment used in the proximity of magnetic influence ordnance. This specification covers finishedequipment (final assembli
3、es). Testing (Pre-screening) of sub-assemblies, components and raw materialswill not guarantee acceptability of the final assemblies.2. APPLICABLE DOCUMENTS2.1 Documents. This section is not applicable to this specification.3. REQUIREMENTS3.1 Authorized Testing Facility. The Naval Explosive Ordnance
4、 Disposal Technology Division(NAVEODTECHDIV), Equipment Management Department, Indian Head, Maryland is designated as thefacility authorized to test and accept equipment and material for compliance with this specification. Thisincludes testing first article and production lot items. Accordingly, all
5、 cognizant procuring activitiesrequiring equipment and material to comply with this specification shall contact the Naval ExplosiveOrdnance Disposal Technology Division, Equipment Management Department, Indian Head, Maryland,20640 for the following:(a) Test Facility, Labor, and Shipping.(b) Test Fac
6、ility Scheduling.Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving thisdocument should be addressed to: Commander, Indian Head Division, Naval Surface Warfare Center, EngineeringDocumentation Branch (Code 4230), 101 Strauss Avenue, In
7、dian Head, MD 20640-5035, by using the StandardizationDocument Improvement Proposal (DD Form 1426) appearing at the end of this document or by sending a letter.AMSC N/A FSC NDTIProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-19595D23.2 First
8、Article. As specified in the contract, the contractor shall furnish first article items of eachequipment type for first article testing and acceptance to the Naval Explosive Ordnance DisposalTechnology Division (see 3.1). First article items shall be tested 100% in accordance with the test methodssp
9、ecified herein.3.3 Production Lot. All production lot items shall meet the test limits of this specification, prior toacceptance by the Government. 100% of production lot items shall be tested by NAVEODTECHDIV.3.4 Magnetic Effects of Non-Electrical Items. The change in flux density of the background
10、 magnetic fieldshall not exceed 5 gamma, also referred to as 5 nT (nanoTeslas), for each test when the items are tested inaccordance with 4.2.1 and 4.2.3.3.5 Magnetic Effects of Electrical Items. If the final assembly (operating item) has electrical circuits, thechange in flux density of the backgro
11、und magnetic field shall not exceed 5 gamma for each test when theitems are tested in accordance with 4.2.1, 4.2.2 and 4.2.3.3.6 Eddy Current Generated Field Limits. Eddy current generated field shall not exceed 5 gamma when theitem is tested in accordance with 4.2.3. For electrical items, eddy curr
12、ent tests will be conducted with theitems powered on and off. 3.7 Station Magnetometer. A calibrated, model HSM-2 Station Magnetometer shall be used to conductmagnetic effects testing specified in paragraphs 4.2.1.2 and 4.2.3.1. The test distances specified in thisdocument are the distances from the
13、 center of the HSM-2 Station Magnetometers active sensor element tothe surface of the test item. When establishing the test distance, the maximum variation is “ 0.25 inch.3.8 Magnetic Idealization Generators. The MK 21 Mod 1 or MK 79 Mod 0 Magnetic IdealizationGenerator shall be used to perform Magn
14、etic Idealization and Demagnetization functions as specified inparagraphs 4.2.1.1 and 4.3.3.9 Item Categorization. All test items are categorized as either contact or non-contact and furthercategorized as a component, special test distance component or an assembly. The item categorizationdetermines
15、the HSM-2 Magnetometer sensors standoff test distances.3.10 Rejection and Resubmission. If the magnetic effect of any item exceeds the limits of 3.4, 3.5 or 3.6, itshall be rejected. If the contractor can correct the rejected item, the item may be resubmitted foracceptance testing.3.11 Identificatio
16、n. Each item that meets the requirements of this specification shall be permanentlymarked with the low-mu symbol, test date (month/year), and facility identification, by the approved,authorized test facility (see 4.1). Equipment that is too small or cannot otherwise be permanently markedshall be tag
17、ged or placed in sealed bags that are appropriately marked.4. VERIFICATION4.1 Classification of inspections. The inspection requirements specified herein are as follows:a. First article inspection (see 4.1.2)b. Quality conformance inspections (see 4.1.3)Provided by IHSNot for ResaleNo reproduction o
18、r networking permitted without license from IHS-,-,-MIL-DTL-19595D34.1.1 Responsibility for Testing. All initial acceptance testing, first article and production lot items, shall beperformed by an authorized test facility. The Naval Explosive Ordnance Disposal Technology Division,Equipment Managemen
19、t Department, Indian Head, Maryland, is currently the only authorized test facility. Naval EOD Technology Division is the certifying agent of additional Military test facilities authorized toconduct re-certification and initial testing of limited locally procured items. The Government reserves theri
20、ght to perform any of the tests set forth in this specification where such tests are deemed necessary toassure supplies and services conform to prescribed requirements.4.1.2 First article inspections. The first article sample shall be subjected to the tests and inspections of 4.2.The rejection of an
21、y sample unit shall be cause for rejection of the first article sample.4.1.3 Quality conformance inspections. All production lot items sample shall be subjected to the tests andinspections of 4.2. The rejection of any sample unit shall be cause for rejection of the production lot.4.2 Test Procedures
22、.4.2.1 TEST PROCEDURE 1. Magnetic Effects Test. Each item shall be idealized as in 4.2.1.1 and thenmeasured for magnetic effect as in 4.2.1.2. The procedure of 4.2.1.1 and 4.2.1.2 shall be sequentiallyfollowed for each of the three reference axes selected as in 4.2.1.5. The magnetic effect of the it
23、em is thelargest of the three measurements.4.2.1.1 Magnetic Idealization. Idealization shall consist of placing each test item in a uniform magneticfield of five gauss, with the items reference axis aligned parallel to the field. A cycled, pulsed magneticfield is superimposed parallel to the five ga
24、uss field. A six second cycle shall consist of the following: atwo second square positive pulse, one second off, a two second square negative pulse of equal amplitude,and finally one second off. The amplitude of the positive pulse of the first cycle shall be between fifty andsixty gauss. The amplitu
25、de of the positive pulse of the each successive cycle shall be reduced by no morethan one gauss per cycle. The cycling shall continue until the amplitude is reduced to zero. The purpose ofidealization is to attempt to temporarily magnetize the test item to provide a worst case condition.4.2.1.2 Magn
26、etic Effects Measurement. The HSM-2 Magnetometer detection sensor shall be alignedparallel to the earths magnetic field. Measurements are taken by introducing the test item to the sensoralong the earths field to the specified test distance. While the test item is at the test distance, it is rotatedt
27、hrough all axes to identify the highest positive and negative readings. All planes of the test item areintroduced to the sensor at the specified test distance. The magnetic effect measurement is the sum of theabsolute values of the highest positive and negative readings.4.2.1.3 Test Distances/Item C
28、ategorization. 4.2.1.3.1 Contact Component. The contact component test distance shall be 2.00 inches from the center ofthe active element in the HSM-2 Magnetometer sensor to the surface of the item.4.2.1.3.2 Contact Assembly. The contact assembly test distance shall be 4.50 inches from the center of
29、 theactive element in the HSM-2 Magnetometer sensor to the surface of the item.4.2.1.3.3 Non-Contact Component. The non-contact component test distance shall be 5.00 inches from thecenter of the active element in the HSM-2 Magnetometer sensor to the surface of the item.4.2.1.3.4 Non-Contact Assembly
30、. The non-contact assembly test distance shall be 12.00 inches from thecenter of the active element in the HSM-2 Magnetometer sensor to the surface of the item.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-19595D44.2.1.3.5 Special Component
31、 Test Distance. A special component test distance is the distance from thecenter of the active element in the HSM-2 Magnetometer sensor to the surface of the item as specified inthe applicable engineering drawings and/or specifications.4.2.1.4 Standard Test Temperature and Earths Magnetic Field Limi
32、ts. Magnetic effect measurementsshall be performed at a temperature of 70 “ 10EF and in an earths magnetic field of 44,000 - 56,000gamma. The field strength is measured when the test item and all other magnetic materials are removedfrom the vicinity of the magnetometer sensor. 4.2.1.5 Selection of R
33、eference Axes. Three mutually perpendicular reference axes shall be selected foreach item. The primary reference axis shall be the longest axis of the item, and the secondary referenceaxis shall be the longest axis perpendicular to the primary axis. The third reference axis shall beperpendicular to
34、the primary and secondary axes.4.2.2 TEST PROCEDURE 2. Test for Magnetic Effects of Electrical Items. The item shall bedemagnetized per 4.3 before testing. The magnetic effects of electrical items shall be measured for eachoperational mode. The magnetic effect measurement is the highest reading obta
35、ined from any operationalmode. Testing shall be in accordance with 4.2.1.2 and 4.2.2.1.4.2.2.1 Electrical Item Test Conditions. Fully charged batteries shall be used for these tests. All controlsshall be adjusted for maximum current flow.4.2.3 TEST PROCEDURE 3. Eddy Current Generated Field Test. The
36、 item shall be demagnetized per4.3 before testing. Each item shall be measured for eddy current generated field as in 4.2.3.1. Procedure4.2.3.1 shall be performed for each of the three reference axes selected as in 4.2.1.5. The eddy currentgenerated field measurement is the highest reading obtained
37、from any of the three idealized axes.4.2.3.1 Eddy Current Generated Field Measurements. The HSM-2 Magnetometer sensor shall be alignedperpendicular to the earths magnetic field. At the start of the measurement, the item shall have itsreference axis aligned perpendicular to the earths magnetic field
38、and passing through the point at which theeddy current generated field is measured. The initial distance between the item and sensor shall be at leasttwo feet. It is then moved in a nutational and oscillating motion, about the center of the reference axis, sothat one end of the item moves toward the
39、 detector while the other end moves away from the sensor. Themovement will be through an angle of 30E, 15E in each direction from the original position of the item atthe sensor. The rate of movement will be such that 15 complete oscillating cycles occur in 10 seconds. Theitem is then brought to test
40、 distance. This is repeated for the other two reference axes. After completingthe nutational and oscillating cycles, the item is removed to the starting point. The eddy current generatedfield is the sum of the absolute values of the largest plus and minus variations as measured during anycycle.4.3 D
41、emagnetization. The test item is placed in the same cycled, pulsed magnetic field used for idealization(see 4.2.1.1) except that the five gauss field is not present. The square wave is centered about zero gauss,instead of the five gauss field. The same six second cycle is repeated until the amplitud
42、e is reduced to zero.The test item shall be aligned with the last axis of magnetic idealization. The purpose of demagnetizationis to cancel any magnetically induced fields.5. PACKAGING5.1 Packaging. This section is not applicable to this specification.6. NOTESProvided by IHSNot for ResaleNo reproduc
43、tion or networking permitted without license from IHS-,-,-MIL-DTL-19595D56.1 Intended Use. Tests described in this document are intended to be applied to items, equipment andmaterials used in the proximity of magnetic influence ordnance. Examples of such items are nonmagnetictools and equipment used
44、 by military, civilian, contractor and other personnel tasked with explosiveordnance disposal missions. These items are not intended for common usage.6.2. Acquisition requirements. Acquisition documents must specify the following:a. Title, number and date of this specification.6.3 Definitions. When
45、used in conjunction with this specification, the following terms are defined.6.3.1 Contact Items. Contact items are intended to be placed in direct contact with magnetic influenceordnance. Examples include: energetic tools, hand tools, lifting shackles, etc.6.3.2 Non-Contact Items. Non-contact items
46、 are not intended to be placed in direct contact with, but inproximity to magnetic influence ordnance. Examples include: sonars, underwater breathing apparatus,swim fins, etc.6.3.3 Assemblies. Assemblies are complete and functional end items capable of performing an operationaltask. Examples include
47、: screwdrivers, AN/PQS-2A sonar, underwater breathing apparatus, etc.6.3.4 Components. Components are all other items not considered assemblies. Examples include: screws,brackets, batteries, valves, gauges, etc.6.3.5 Units of Measure. 1 gamma = 10-5 gauss = 10-5 oersted = 10-9 webers/M2 = 10-9 tesla
48、 = 1nT6.4 Subject Term (Key Word) Listing.EOD;Man rated6.5 Changes from Previous Issue. Marginal notations are not used in this revision to identify changes withrespect to the previous issue due to the extensiveness of the changesCustodians: Preparing Activity:Navy - OS Navy - OS(Project NDTI-N289)P
49、rovided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-STANDARDIZATION DOCUMENT IMPROVEMENT PROPOSALINSTRUCTIONS1. The preparing activity must complete blocks 1, 2, 3, and 8. In block 1, both the document number and revision lettershould be given.2. The submitter of this form must complete blocks 4, 5, 6, and 7.3. The preparing activity must provide a reply within 30 days from receipt of the form.NOTE: This form may not be used to
