REG MSFC-RQMT-2918 REV C-2012 REQUIREMENTS FOR ELECTROSTATIC DISCHARGE CONTROL.pdf

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1、 CHECK THE MASTER LISTVERIFY THAT THIS IS THE CORRECT VERSION BEFORE USE at https:/repository.msfc.nasa.gov/docs/multiprogram/MSFC-RQMT-2918 MSFC-RQMT-2918 National Aeronautics and REVISION C Space Administration EFFECTIVE DATE: OCTOBER 18, 2012 George C. Marshall Space Flight Center Marshall Space

2、Flight Center, Alabama 35812 QD01 MSFC TECHNICAL STANDARD REQUIREMENTS FOR ELECTROSTATIC DISCHARGE CONTROL NOT MEASUREMENT SENSITIVE Approved for Public Release; Distribution is Unlimited Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MSFC Technical

3、 Standard QD01 Title: Requirements for Electrostatic Discharge Control Document No.: MSFC-RQMT-2918 Revision: C Effective Date: 10/18/12 Page 2 of 24 CHECK THE MASTER LIST - VERIFY THAT THIS IS THE CORRECT VERSION BEFORE USE at https:/repository.msfc.nasa.gov/docs/multiprogram/MSFC-RQMT-2918 DOCUMEN

4、T HISTORY LOG Status (Baseline/ Revision/ Canceled) Document Revision Effective Date Description Baseline 02/05/99 Initial Release. Revision A 09/01/00 Converted document to new template. Revised document to delete references to previous MSFC-P documents. Changed Quality Assurance to Safety and Miss

5、ion Assurance (S document is authorized through MPDMS. Major rewrite. This document was updated using NASA-HDBK-8739.21 to provide standardized guidance based on Agency-level best practices. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MSFC Techni

6、cal Standard QD01 Title: Requirements for Electrostatic Discharge Control Document No.: MSFC-RQMT-2918 Revision: C Effective Date: 10/18/12 Page 3 of 24 CHECK THE MASTER LIST - VERIFY THAT THIS IS THE CORRECT VERSION BEFORE USE at https:/repository.msfc.nasa.gov/docs/multiprogram/MSFC-RQMT-2918 FORE

7、WORD This document provides requirements for prevention of electrostatic discharge (ESD) events and for protection of hardware from ESD. The document shall be applicable to MSFC in-house activities for flight hardware. This document has been tailored to comply with the requirements of ANSI/ESD S20.2

8、0 as specified per NASA Policy Directive (NPD) 8730.5, NASA Quality Assurance Program Policy. The NASA-HBDK-8739.21 was also used to provide standardized guidance based on Agency-level best practices. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-M

9、SFC Technical Standard QD01 Title: Requirements for Electrostatic Discharge Control Document No.: MSFC-RQMT-2918 Revision: C Effective Date: 10/18/12 Page 4 of 24 CHECK THE MASTER LIST - VERIFY THAT THIS IS THE CORRECT VERSION BEFORE USE at https:/repository.msfc.nasa.gov/docs/multiprogram/MSFC-RQMT

10、-2918 CONTENTS PARAGRAPH PAGE DOCUMENT HISTORY LOG.2 FOREWORD 3 1. SCOPE 6 2. APPLICABLE AND REFERENCE DOCUMENTS .6 3. DEFINITIONS 7 4. GENERAL REQUIREMENTS 9 5. DETAILED REQUIREMENTS .10 5.1 Handling 10 5.1.1 Packaging 10 5.1.2 Receiving 10 5.1.3 Kitting and Shipping .11 5.1.4 Component Testing (Bl

11、ack Box) 11 5.2 Protective Areas/Workstations 11 5.2.1 Access .11 5.2.2 Work Surfaces .11 5.2.3 Flooring .12 5.2.4 Air Ionizers .12 5.3 Personnel Grounding Devices .12 5.3.1 Wrist Straps .12 5.3.2 Foot Grounding Devices .12 5.4 ESD Grounding System Verification. .12 5.4.1 AC Equipment Ground. 13 5.4

12、.2 ESD Technical Elements .13 5.4.3 Facilities with AC Equipment Ground and Auxiliary Ground1 3 5.4.4 Field Service/Equipotential Bonding (Applications without AC Equipment Ground).13 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MSFC Technical Sta

13、ndard QD01 Title: Requirements for Electrostatic Discharge Control Document No.: MSFC-RQMT-2918 Revision: C Effective Date: 10/18/12 Page 5 of 24 CHECK THE MASTER LIST - VERIFY THAT THIS IS THE CORRECT VERSION BEFORE USE at https:/repository.msfc.nasa.gov/docs/multiprogram/MSFC-RQMT-2918 5.5 Accesso

14、ries .13 5.6 Humidity .14 5.7 Identification and Marking 14 5.8 Monitoring 14 5.8.1 Periodic Compliance Verification Testing 14 5.8.2 Daily Test Measurements 15 5.8.3 Audits 15 6. NOTES 15 7. SAFETY PRECAUTIONS AND WARNING NOTES .15 8. APPENDICES, DATA, REPORTS, AND FORMS 16 9 RECORDS 16 10. TOOLS,

15、EQUIPMENT, AND MATERIALS 16 11. PERSONNEL TRAINING AND CERTIFICATION .17 FIGURE 1. ESD Certification Badge .18 2. Typical ESD Grounded Workstation Layout 19 3. Workstation Common Point Ground Connections .19 4. Preferred Ground Connection and Main(s) Service Equipment .20 5. AC Equipment Ground Resi

16、stance Measurement Test Points .21 TABLE I. ESD Compliance Verification Schedule and Measurements. .22 II. Recommendations Applicable to HBM Class 0 ESD Devices.24 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MSFC Technical Standard QD01 Title: Re

17、quirements for Electrostatic Discharge Control Document No.: MSFC-RQMT-2918 Revision: C Effective Date: 10/18/12 Page 6 of 24 CHECK THE MASTER LIST - VERIFY THAT THIS IS THE CORRECT VERSION BEFORE USE at https:/repository.msfc.nasa.gov/docs/multiprogram/MSFC-RQMT-2918 1.0 SCOPE This document provide

18、s a consistent application of requirements for an electrostatic discharge (ESD) control program for electrical or electronic assemblies, equipment, and their constituent parts susceptible to damage from ESD. This document shall not apply to ESD requirements for electrically initiated explosive devic

19、es. For propellant and explosive devices, reference MSFC-STD-1800 or other approved procedures. This document shall be for use internally at MSFC and shall not be invoked or specified on contracts. Use ANSI/ESD S20.20 or other approved ESD control procedures for contracts. This document shall apply

20、to all MSFC organizational elements involved in the design, procurement, receiving, inspection, fabrication, test, handling, storage, and operation of flight and flight associated hardware containing ESD sensitive items for MSFC projects. Specifically, these requirements shall apply to the following

21、 personnel as a minimum: electrical designers, engineers who troubleshoot electrical hardware, manufacturing personnel, quality assurance (QA) personnel, shipping/receiving personnel, kitting personnel, and electrical test personnel. 2.0 APPLICABLE AND REFERENCE DOCUMENTS 2.1 APPLICABLE DOCUMENTS Do

22、cument Number Title ANSI/ESD S1.1 ANSI/ESD STM3.1 ANSI/ESD S4.1 ANSI/ESD S6.1 ANSI/ESD S7.1 ANSI/ESD STM12.1 ANSI/ESD STM13.1 ANSI/ESD S20.20 Wrist Straps Ionization Worksurfaces-Resistance Measurements Grounding Floor Materials Characterization of Materials Seating-Resistive Measurement Electrical

23、Soldering/Desoldering Hand Tools ESD Association Standard for the Development of an Electrostatic Discharge Control Program for Protection of Electrical and Electronic Parts, Assemblies, and Equipment (Excluding Electrically Initiated Explosive Devices) ANSI/ESD TR20.20 ANSI/ESD TR53 ANSI/ESD STM97.

24、1 Handbook for the Development of an Electrostatic Discharge Control Program for the Protection of Electronic Parts, Assemblies and Equipment Compliance Verification of ESD Protective Equipment and Materials Floor Materials and Footwear-Resistance Measurement in Combination with a Person Provided by

25、 IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MSFC Technical Standard QD01 Title: Requirements for Electrostatic Discharge Control Document No.: MSFC-RQMT-2918 Revision: C Effective Date: 10/18/12 Page 7 of 24 CHECK THE MASTER LIST - VERIFY THAT THIS IS THE C

26、ORRECT VERSION BEFORE USE at https:/repository.msfc.nasa.gov/docs/multiprogram/MSFC-RQMT-2918 MIL-STD-129 Standard Practice Military Marking For Shipment And Storage MWI 3410.1 NASA-HDBK-8739.21 NPD 8730.5 NFPA 70 Marshall Work Instructions (MWI), Personnel Certification Program Workmanship Manual f

27、or Electrostatic Discharge Control (Excluding Electrically Initiated Explosive Devices) NASA Quality Assurance Program Policy National Electrical Code 2.2 REFERENCE DOCUMENTS MSFC-STD-1800 Electrostatic Discharge (ESD) Control For Propellant and Explosive Devices 3.0 DEFINITIONS a. Antistatic . Usua

28、lly refers to the property of a material that inhibits triboelectric (friction) charging. NOTE: A materials antistatic characteristic is not necessarily correlatable with its resistivity or resistance. b. Conductive Material. A material that has a surface resistance of less than 1 x 104 ohms. c. Ele

29、ctrostatic Discharge (ESD). The rapid, spontaneous transfer of electrostatic charge induced by a high electrostatic field. Note: Usually, the charge flows through a spark between two bodies at different electrostatic potentials as they approach one another. Details of such processes, such as the rat

30、e of the charge transfer, are described in specific electrostatic discharge models. d. Electrostatic Discharge Sensitive (ESDS). The ESD level that causes component failure. e. Electrostatic Field. An attractive or repulsive force in space due to the presence of electric charge. f. Equipment Groundi

31、ng Conductor. The conductor used to connect the non-current carrying metal parts of equipment, raceways, and other enclosures to the system grounded conductor, the grounding electrode conductor, or both at the service equipment. g. ESD Protected Area/Workstation. Area or workstation constructed and

32、equipped with necessary ESD protective materials, equipment and procedures to limit ESD voltages below the sensitivity level of handled ESDS items. A protected area differs from a workstation by Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MSFC Te

33、chnical Standard QD01 Title: Requirements for Electrostatic Discharge Control Document No.: MSFC-RQMT-2918 Revision: C Effective Date: 10/18/12 Page 8 of 24 CHECK THE MASTER LIST - VERIFY THAT THIS IS THE CORRECT VERSION BEFORE USE at https:/repository.msfc.nasa.gov/docs/multiprogram/MSFC-RQMT-2918

34、accessibility. Access to protected areas is limited to certified personnel or personnel escorted by certified personnel. h. Ground. 1) A conducting connection, whether intentional or accidental between an electrical circuit or equipment and the earth, or to some conducting body that serves in place

35、of the earth. 2) The position or portion of an electrical circuit at zero potential with respect to earth. 3) A conducting body, such as the earth or the hull of a steel ship or vehicle, used as a return path for electric currents and as an arbitrary zero reference point. i. Groundable Point (Gp). A

36、ny point with low impedance to ground where grounding may be attached. Usually, it is the common point ground (CPG). j. Grounded. Connected to the earth or some conducting body that serves in place of the earth. k. Grounded Conductor (i.e., the Neutral conductor). A system or circuit conductor that

37、is intentionally grounded. l. Grounding Electrode(s). A metal underground water pipe, metal frame of a building or structure, ground ring encircling a building or structure, or an iron or steel rod/pipe/plate electrode in direct contact with the earth and electrically continuous to the points of con

38、nection of the grounding electrode conductor and bonding conductor/jumper. m. Grounding Electrode Conductor. The conductor used to connect the grounding electrode(s) to the equipment grounding conductor, to the grounded conductor, or to both, at the service equipment. n. Hard Ground. A connection to

39、 earth ground either directly or through low impedance. o. Human Body Model (HBM). The most commonly used model for ESD sensitivity levels of electronic devices. This model reflects the discharge effects when a person touches an electronic device. The HBM classifications are specified in accordance

40、with the requirements of ANSI/ESD S20.20 and other approved ESD documents. p. Impedance. The total opposition (i.e., due to resistance and reactance) a circuit offers to the flow of alternating current. It is measured in ohms and the lower the ohmic value, the better the quality of the conductor. q.

41、 Raceway. An enclosed channel of metal or nonmetallic materials designed expressly for holding wires, cables, or busbars. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MSFC Technical Standard QD01 Title: Requirements for Electrostatic Discharge Con

42、trol Document No.: MSFC-RQMT-2918 Revision: C Effective Date: 10/18/12 Page 9 of 24 CHECK THE MASTER LIST - VERIFY THAT THIS IS THE CORRECT VERSION BEFORE USE at https:/repository.msfc.nasa.gov/docs/multiprogram/MSFC-RQMT-2918 r. Soft Ground. A connection to ground through an impedance sufficiently

43、high to limit current flow to safe levels for personnel (normally 5 milli-Amperes). Impedance needed for a soft ground is dependent upon the voltage levels which could be contacted by personnel near the ground. s. Static Dissipative Materials. ESD protective material having surface resistivities gre

44、ater than 1 x 105 but not greater than 1 x 1012 ohms per square. t. Surface Resistance. The ratio of DC voltage to the current flowing between two electrodes of specified configuration that contact the same side of a material. This measurement is expressed in ohms. u. Surface (Sheet) Resistivity. Th

45、e surface resistivity is an inverse measure of the conductivity of a material and equal to the ratio of the potential gradient to the current per unit width of the surface, where the potential gradient is measured in the direction of the current flow in the material. (Note: Surface resistivity is nu

46、merically equal to the surface resistance between two electrodes forming opposite sides of a square. The size of the square is immaterial. Surface resistivity applies to both surface and volume conductive materials and has the value of ohms per square.) v. Triboelectric (friction) charging. The gene

47、ration of electrostatic charges when two materials make contact or are rubbed together, then separated. 4.0 GENERAL REQUIREMENTS ESD controls, as a minimum, shall be implemented to include the following ESD control program requirements: a. The minimum protection for ESDS design shall be as specified

48、 per the engineering documentation. b. Protected areas and work stations shall be established and verified as adequate by Safety and Mission Assurance (S and ANSI ESD STM3.1 Discharge time: User defined Offset voltage: 50 Volts X 13 5 Soldering Iron Tip to Ground Resistance ESD STM13.1; and ESD TR20.20 Verify first that the voltage is 2.0 mVAC to the common ground point; then verify that resistance is 20 ohms to the common point ground during periodic verification. X 14 AC Equipment Ground ESD TR53; and ANSI ESD S6.1 1 ohm total resistance. X 15 Auxiliary Ground ESD T