ANSI/ESD S20.20 Has Three Categories of ESD Garments – Why? ANSI/ESD S20.20-2007 has three Garment categories with the following names and required limits: Static Control Garment < 1 x 10^11 ohms Groundable Static Control Garment < 1 x 10^9 ohms Groundable Static Control Garment System < 3.5 x 10^7 ohms Per section 8.2 Personnel Grounding…
Read more ANSI/ESD S20.20 Has Three Categories of ESD Garments – Why?
For Compliance Verification periodic testing, how frequently should an ESD control item be checked? Answer: It is user defined, so it is up to you. Best practice is to test each and every ionizer, but you could also decide (if you got good results) to test a percentage of a particular ESD control item. The…
Question: I am confused on ESD connections. I understand that you cannot clip a cord from a wrist strap to the edge of an ESD protective mat. I know that the common cord for wrist straps has 1 megohm of resistance and that the point to connect the wrist strap cord should have less than…
“Any auxiliary grounds (water pipe, building frame, ground stake) present and used at the workstation must be bonded to the equipment ground.” A low resistance connector (such as metal wire) should be soldered or mechanically attached electrically connecting the building electrical system AC ground (Equipment Ground) to the Auxiliary Ground. ESD Handbook TR20.20 section 5.1.3…
Read more What is the proper procedure for connecting the ESD ground to the building ground?
Question: What happens if you staple ESD Bags shut? Does that damage the ESD Bag’s effectiveness? What if the ESD Bag is heat sealed shut & a staple on the seam is used to attach paperwork? Answer: Desco Statshield® ESD Shielding Bags have a layer of metalized film which creates continuous conductive enclosure or Faraday…
Question: How are the electronics inside plastic cell phones and hand held computers protected from externally generated electrostatic fields? -Anonymous, Elkhorn, Wisconsin Answer: The electronics inside plastic cell phones and hand held computers may be protected from externally generated electrostatic fields by several factors: 1 – a static electric field does not generally penetrate materials,…
ElectroStatic Discharge (ESD) is the hidden enemy within your factory. You cannot feel or see most ESD events but they can cause electronic components to fail or cause mysterious and annoying problems. There are two types of ESD damage: 1) Catastrophic failures, and 2) Latent defects. By definition, normal quality control inspections are able to…
What Not to Do with an ESD Shielding Bag Replacement circuit boards or other ESD sensitive items should be handled by the grounded operator or be on a grounded mat. Since the ESD sensitive item comes packaged in an ESD (metal-in or metal-out) shielding bags, many people believe they should continue to use the bag.…
Does it matter where a person should wear the wrist strap? Desco is happy to share our knowledge of ESD control through our Answer’s Database. We have 5 NARTE Certified ESD Technicians, we are a member of the ESD Association, and we have 30+ years of manufacturing products for ESD control. See the following question…
Read more Can anyone wear their wrist strap on their leg instead of their wrist?