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Compliance Verification Testing of Installed ESD Protective Products ©Copyright 2011 DESCO INDUSTRIES INC. 9/05.

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Presentation on theme: "Compliance Verification Testing of Installed ESD Protective Products ©Copyright 2011 DESCO INDUSTRIES INC. 9/05."— Presentation transcript:

1 Compliance Verification Testing of Installed ESD Protective Products ©Copyright 2011 DESCO INDUSTRIES INC. 9/05

2 ESD TR53 Compliance Verification Use ESD Association Technical Report ESD TR Compliance Verification of ESD Protective Equipment and Materials. Can be purchased from TR53 includes equipment, test procedures and troubleshooting tips to periodically verify the performance of ESD protective equipment and materials.www.ESDA.org Desco.com

3 ESD Protected Area Clearly Identified Caution signs indicating the existence of the Protected Area shall be posted and clearly visible to personnel prior to entry to the EPA [ESD Protected Area]. NOTE: An EPA can consist of a single workstation, entire room or building. Ref: ANSI/ESD S20.20 section 8.3. Report Visual Observations Desco.com

4 Attention Sign Aisle Tape ESD Protected Area Clearly Identified

5 Access to the EPA shall be limited to personnel who have completed appropriate ESD training Untrained individuals shall be escorted by trained personnel while in an EPA. Ref: ANSI/ESD S20.20 section 8.3. Report Visual Observations Access to ESD Protected Area Controlled Desco.com

6 Wrist Strap & Footwear Tester SmartLogX3

7 Check Ground The AC equipment ground is the preferred ground connection because all electrical equipment (e.g., soldering irons,' scopes, etc.) at the workstation is already connected to this ground. Ref: ESD Handbook ESD TR20.20 section Check AC outlet properly wired with AC Outlet Analyzer Desco.com

8 AC Outlet Analyzer and Wrist Strap Tester Check Ground

9 Check Ground Points < 1 Ohm Can use ohmmeter or (as an indicator) Megohmmeter (note: if has resistor expected measurement 1 megohm +/- 20%) Suggest extension cord with AC Outlet Analyzer to connect to AC equipment ground and use Surface Resistance Megohmmeter without 5# Electrodes. Plug one lead into wrist strap ground jack and sensing lead into electrical ground At 10 volts, look for lowest reading if no resistor or about 1 x 10^6 ohms if there is a resistor. Report Rtg Desco.com

10 Ohmmeter Check Ground Points < 1 Ohm

11 No Resistor in Mat Ground Cord a direct connection from the ESD technical element to the common point ground or common connection point is acceptable and recommended. Note: Manufacturers may add resistance to the grounding conductors for purposes other than ESD (e.g. current limiting). … The typical added resistance in grounding conductors is 1 megohm Ref: Grounding ANSI/ESD S6.1 section Desco.com

12 Rtg and Rtt Resistance The most important resistance measurement is resistance to ground or Rtg. How well the material conducts charges to ground; whether material is or can be grounded Rtg or Resistance to ground The resistance in ohms measured between a single electrode placed on a surface and ground. Rtt or Point-to-point resistance (or top to top) The resistance in ohms measured between two electrodes placed on any surface. Desco.com

13 Worksurfaces 10^6 – 10^8 Ohms Use Megohmmeter Test Kit Worksurfaces, Shelves, and Cart storage surfaces in EPA S20.20 specifies no lower limit, however, ANSI/ESD S4.1 recommends in the manufacturing environment a resistance range of over or equal to 1 x 10^6 to less than 1 x 10^9 ohms. Report Rtg resistance mat to equipment ground If fails or if measures close to 1 x10^6 ohms (perhaps measuring resistor in ground cord) measure Rtt with two 5# electrodes about 10 apart measuring mat resistance itself. Desco.com

14 Worksurfaces 10^6 – 10^8 Ohms Use Megohmmeter Test Kit

15 Use Megohmmeter Test Kit For Rtg use Surface Resistance Megohmmeter with one 5# electrode For Rtt use Surface Resistance Megohmmeter with two 5# electrodes Measure at 10 volts; if over 10^5 then at 100 volts Desco will change test voltage automatically, and has a switch to set only at 10 volts Some other equipment use a manual switch Desco.com

16 Worksurfaces 10 6 – 10 8 Ohms Use Megohmmeter Test Kit For Rtg use Surface Resistance Megohmmeter with one 5# Electrode Suggest using a extension cord with AC Outlet Analyzer to connect sensing lead to AC equipment ground Place the one 5# electrode on mats center or most worn area; measure Rtg at 10 volts; if over 10^5 at 100 volts Measure at least one of each type or color mat and laminate. If fail high, measure Rtt with two 5# electrodes about 10 apart before and after cleaning (first allow to dry). Report Rtg (& Rtt if fail) Desco.com

17 Worksurfaces Troubleshooting ESD Mat Cleaner Static dissipative solution cleans & restores ESD properties Does not contain silicone which will leave a insulative film Report observations and Rtg or Rtt before and after cleaning allowing time to dry –Cleaners will have some alcohol as a carrier. As the alcohol evaporates, it cools the surface and thus condenses moisture on the surface. Recommended "dry time" is ~20 minutes from cleaning to retest Desco.com

18 Worksurface Troubleshooting Check if Properly Grounded Grounding / Equipotential Bonding Systems shall be used to ensure that ESDS items, personnel and any other conductors (e.g., mobile equipment) are at the same electrical potential. Ref: ANSI/ESD S section 8.1 Use ohmmeter to ensure electrical continuity between components in path to ground Desco.com

19 ESD Seating < 10^9 Ohms Use Megohmmeter Test Kit Use Surface Resistance Megohmmeter with one 5# Electrode Suggest extension cord with AC Outlet Analyzer to connect sensing lead to equipment ground Place the one 5# electrode on various seating surfaces Measure Rtg at 10 volts; if over 10^5 at 100 volts Can measure with two 5# Electrodes; one on seating and one to known good ESD Floor Report resistance measurements. Desco.com

20 ESD Seating Troubleshooting If high Rtg, measure ESD Floor Rtg to determine if floor is high If high, check if conductive casters are dirty If high, use ohmmeter to ensure electrical continuity between components in path to ground Note: if measuring Seating back surface ensure that you are holding insulative surface of 5# Electrode (or wear insulative gloves) otherwise could create a secondary path to ground through the person performing the test Desco.com

21 Storage Shelves & Cart Shelves Electrically Connected & Grounded Less than 10^9 ohms Rtg; 10^6-10^8 if unprotected ESD sensitive items (ESDS) Mats and Shelves worksurfaces to be grounded Use Surface Resistance Megohmmeter with one 5# electrode same test as worksurface Can measure with two 5# Electrodes to a known good ESD Floor If shelf material is unknown, measure Rtt with two 5# electrodes about 10 apart Report resistance measured Desco.com

22 ESD Flooring Less Than 10^9 Ohms Rtg Per Floor standard ANSI/ESD S7.1 section Perform a minimum of five tests per contiguous floor surface material or a minimum of five tests per 5,000 square feet (464.5 m2) of floor material, whichever is greater. A minimum of three of the five tests should be conducted in those areas that are subject to wear or that have chemical or water spillage or that are visibly dirty. Report Rtg and Rtt if measured Desco.com

23 ESD Floor <10^9 Ohms Use Megohmmeter Test Kit

24 ESD Floor Less Than 10^9 Ohms Rtg Use Surface Resistance Megohmmeter with one 5# Electrode Suggest extension cord with AC Outlet Analyzer to connect sensing lead to equipment ground For 3 of 5 tests, place the one 5# electrode on areas that are subject to wear or that have chemical or water spillage or that are visibly dirty. Measure Rtg at 10 VDC; if over 10^5 at 100 VDC If fail high, measure Rtt with two 5# electrodes about 3 feet apart before and after cleaning (first allow to dry). If tiles, place electrodes on different tiles. Report Rtg and Rtt if measured Desco.com

25 Flooring-Footwear System Less Than 35 megohms Rtg Use Surface Resistance Megohmmeter with one 5# Electrode Suggest extension cord with AC Outlet Analyzer to connect sensing lead to equipment ground Place the one 5# electrode on bare palm of person wearing ESD footwear standing on ESD Floor; Measure Rtg at 10 VDC; should be < ^7 ohms (35 megohms) resistance in series thru person – ESD Footwear – ESD Floor to ground. Report Rtg Desco.com

26 Personnel Grounding Guideline Resistance (megohms) Body Voltage Desco.com Data used to set Resistance Limit in Combination with a Person < 35 megohms ESD TR20.20 Figure 14 Relationship Body Voltage and Resistance to Ground

27 Flooring-Footwear System Charge Generation Less Than 100V Use Charged Plate Monitor to measure electrostatic charge on a person wearing ESD Footwear on ESD Floor. With person connected to isolated conductive plate via a wrist strap and bulldog clip, and moving feet, report highest peak voltage Desco.com

28 Charged Plate Analyzer

29 Flooring-Footwear System Demonstration Need both ESD flooring and footwear To demonstrate can use Human Body Model Fixture & Ionization Test Kit Try regular athletic shoes on ESD floor and then with ESD Footwear Ground equipment and hold Fixture portion Have person moving feet or walking. Note peak voltage Desco.com

30 Human Body Model Fixture & Ionization Test Kit

31 Flooring-Footwear System Charge Generation Less Than 100V Charged Plate Monitor for more accurate reading Human Body Model Fixture & Ionization Test Kit for indication or demonstration purposes Dance 6-step recommended in ANSI/ESD 97.2, or as people normally walk in the facility Desco.com

32 ESD Protected Area Clear of Insulators All nonessential insulators, such as those made of plastics and paper must be removed from the ESD workstation. Less than 2,000 volts or kept 12 from ESDS Visual – Are non-essential insulators present? Measure what charge can be generated on item Use Static Field Meter to measure ability to charge after rubbing item with hand or on your clothing. Report voltage; report observations of closest distance to ESD Sensitive component or assembly Desco.com

33 Digital Field Meter

34 Measuring ElectroStatic Field Tips Static Field Meter may have oscillating light beam to position 1 away from surface. Typically display ElectroStatic field in kilovolts (so 1.20 would be 1,200 volts) Static Field Meter to be grounded Technician to be grounded Measured charge on items smaller than 3" x 3 only an indication Desco.com

35 ESD Protected Area Clear of Insulators - Resistance Can measure Rtg with item between 5# electrode and ESD mat Use Surface Resistance Test Kit sensing lead to AC equipment ground & one 5# electrode on item on ESD mat. Note: paper absorbs moisture so may not interfere with path-to-ground, but measure with & without Report resistance Rtg Desco.com

36 ESD Garments Compliance Verification ESD Garment should be grounded via cord or ESD flooring/footwear. Can be tested while worn using a Wrist Strap or Footwear Tester < 3.5 x 10^7 ohms Observe that Garment is properly worn covering all clothing with cuffs or wristband in snug contact with skin. Can use Surface Resistance Megohmmeter with two 5# Electrodes sleeve to sleeve Rtt Place Garment on insulative surface; place one 5# electrode on each sleeve or cuff. Measure Rtt at 10 volts; if over 10^5 ohms at 100 volts Desco.com

37 Garment on Insulative Surface Testing ESD Garments Rtt Sleeve to Sleeve

38 Essential Insulators Neutralized with Ionizers Necessary non-conductors in the environment cannot lose their electrostatic charge by attachment to ground. Ionization systems provide neutralization of charges on these necessary non-conductive items (circuit board materials and some device packages are examples of necessary non-conductors). [ANSI/ESD S Foreword] Test Ionizers, use Charged Plate Monitor or Ionization Test Kit Report Offset Voltage (Balance) & Discharge Times (both polarities) Desco.com

39 Ionizer being Tested

40 Ionizers < +/-50 Offset Voltage User Defined Discharge Times Test ionizer as being used; do not clean. Remove from the surface only those items that might block airflow. Technician and Ionization Test Kit to be grounded. If adjustable, zero reading, and then locate test fixture on worksurface furthest away from the ionizer where ESD sensitive products are handled. Using Charging Unit, hold acorn nut & simultaneously press button to charge Conductive Plate. With Ionizer operating at normal speed, use a stop watch or count time in seconds it takes to go from 1,000 volt reading to 100 volts. Change polarity and repeat discharge time test -1,000 volts to -100 volts Measure Offset Voltage or Balance reading after allowing sufficient time for reading to stabilize. Record Discharge Times and Offset Voltage Desco.com

41 Ionizer Troubleshooting If poor performance, remove filter & repeat test without filter in place (passing then suggests maintenance is the problem). If still fails, remove electrical power, and clean wiping emitter pins with alcohol & re-test. Calibrate: adjust improving offset voltage [balance] to near zero Desco.com

42 Continuous Monitors Checked Continuous monitoring devices should be functionally checked prior to use and periodically to ensure that they are operating as designed. Use Manufacturers Calibration or Verification Device Follow manufacturers instructions Desco.com

43 Continuous Monitor Calibration Unit

44 Packaging / Material Handling Dissipative Preferred 10^4 – 10^10 ohms Can use Static Field Meter to measure ability to charge after rubbing surface. Report voltage; report observations of closest distance to ESDS Use Surface Resistance Megohmmeter with two 5# Electrodes Place Packaging on insulative surface; place 5# electrodes 10 apart if possible. Measure Rtt at 10 VDC; if over 10^5 ohms, measure Rtt at 100 VDC Report Voltage and/or Rtt Desco.com

45 Use Shielding Bags / Containers Outside ESD Protected Area When not specified by [contract]… the organization shall define ESD protective packaging requirements, both inside and outside the EPA per ANSI/ESD S541. Ref: ANSI/ESD S section 8.4 Desco.com

46 In-Plant Handler

47 Are Re-used Bags / Containers in Good Condition? Users should be aware that some packaging materials may be humidity dependent and may have limited shelf life. They may also lose static shielding properties by crumpling, puncturing and folding. Report: Observations Desco.com

48 ESD Packaging Properly Marked ESD protective packaging should be marked in accordance with ESD Protective Symbol [ANSI/ESD S541] Desco.com

49 Test Per What Reference? Compliance Verification of ESD Protective Equipment and Materials ESD TR Recommend buying a copy from at Desco.com

50 Compliance Verification Testing of Installed ESD Products Desco.com


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