How To Set Up Esd Mat

half-dozen steps to choosing and installing an ESD working surface

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The purpose of an ESD protective working surface is to aid in the prevention of impairment to ESD sensitive items (ESDS) and assemblies from electrostatic discharge. An ESD protective working surface provides protection in the post-obit two means:

• Providing a low charging (antistatic) working surface area that will limit static electricity to be generated below potentially damaging levels.
• Removing the electrostatic charge from conductive objects placed on the working surface.

one. Types of ESD working surface

ESD protective working surfaces are categorised into two general categories: conductive and dissipative .

A conductive working surface is divers by near documents as a textile that has a surface resistance of less than one x ten⁴ ohms. Conductive materials are the quickest to ground a charge only they tin besides cause damage by discharging too rapidly. Conductive materials are ordinarily used as floor mats or floor products.

A dissipative working surface is defined every bit existence materials having a surface resistance of at to the lowest degree 1 x 10⁴, but less than 1 x ten⁹ ohms. Dissipative materials volition dissipate a charge slower and are recommended for handling electronic components. Dissipative materials are normally the preferred choice for demote acme working surfaces.

Most people in the industry consider working surfaces to be the second most important office of an ESD Command Plan, with personnel grounding being almost important.

2. Grounding Methods for working surfaces

Method 1: Grounding via ground cords

• Vermason recommends using an earth bonding bespeak string when grounding via basis cords. Most globe bonding point cords volition ground an ESD protective working surface and provide assistant jacks for 2 wrist strap grounds.

  

  Earth Bonding Point for each workstation

• An earth bonding indicate should be installed at each workstation and should be connected directly to a verified electrical system ground or to a verified grounding bus which is connected to the protective earth ground. Only one groundable point should be installed on a working surface.
• Wrist straps should never exist grounded through a working surface, as the added resistance of the working surface material will preclude the wrist strap from operating properly.

Proper Grounding of Wrist Straps

Method two: Grounding via a grounded conductive surface

• This alternate form of grounding should just be employed when using a homogeneous dissipative material with a book resistance of less than 1 10 10⁸
• The dissipative working surface may be placed on a properly grounded laminate, metal or other conductive surface. The working surface will electrically couple to the grounded surface and may not require a separate ground cord.
• When using this type of grounding method exist certain to examination that the working surface Rg is less than one x ten⁹ ohms, tested per IEC 61340-2-3. Likewise consider increasing Compliance Verification exam frequency.

Alternate Grounding Method via a Grounded Conductive Surface

three. Groundable Point Installation

Before installing a groundable betoken on your work surface you lot must first make up one's mind whether you volition need a male stud or female person socket, the type of snap hardware and the desired location. In that location are by and large 3 types of groundable points available for working surface mats: screw-on snap kits, push & assure snaps (with prongs) or stud & posts sets (requiring installation using a punch and an anvil).

Snap Kits and Tools

Screw-on Snaps:

• Make up one's mind the position of the grounding snap (i only per mat). Punch a hole through the material with a pocket-sized Phillips screwdriver or awl.
• Insert the screw through the bottom on the snap fastener, the washer and the material. Affix the assembly with the conical nut supplied with the kit and tighten down the screws.

Installing a spiral-on Mat Grounding Snap Push & clinch snaps:This snap is designed for use with whatsoever type of soft mat fabric: dissipative, conductive or multi-layered. It is recommended for use with three-layered material, because it provides better contact with the internal conductive layer. It is recommended that earlier inserting this snap, the mat exist punctured with a sharp tool where the snap will exist placed. Centre the prongs on the snap assembly. Apply pressure to the snap until the prongs come up through the dorsum of the mat, then assure over prongs making apartment to the mat's bottom side to secure snap as shown in the below flick.

Installing Push button & Clinch Mat Grounding Snap Stud & post sets:This blazon of groundable indicate must exist riveted through bench and floor mats to connect ground cords. A dial and anvil are elementary but effective tools to reach a neat finish with firm materials no more than 4mm thick.

• Dial a 5mm diameter hole at the desired location of the mat.
• Insert the mail from underneath and apply the stud over the protruding post on the top side.
• Fit the anvil under the mail service and place the dial inside the stud and hammer the post (or utilise an arbor press) until it rolls and a tight assembly is accomplished.

Using a Punch and Anvil to install Stud & Post Sets four. Selection of Common Point & Floor Mat Grounding Systems

• Determine the type of common indicate grounding system you will use: barrier strip, motorcoach bar, grounding block or mutual point footing cord. Vermason recommends the use of mutual point ground cords and globe bonding bars.
• If you determine that you volition utilize ground cords, yous must now determine the type of ground cord y'all will utilize for your workstation grounds. It is the user'southward preference to utilize a ground cord with or without a current limiting i megohm resistor to basis working surfaces or floor mats. Choice of the basis cord is adamant by user needs and specifications; the resistor is non for ESD control.

  

  Examples of Grounding Cords

• Earth bonding point confined permit the grounding of multiple operators at one common basis bespeak. They also mount easily under the front edge of a workstation benchtop.

Earth Bonding Indicate Installation 5. Mat Installation

• For best results, allow the mats to lay flat for well-nigh four hours at room temperature before installing. This will give the material time to flatten out from being rolled for shipment.
• Examination all workstation grounds for proper resistance to footing.
• Lay the mat in position and snap the footing string to information technology. Bring the other end of the footing string to the common basis point (or earth bonding bar) and attach information technology using the band terminal (or other termination device). The electrical systems junction box and connecting conduit should too connect to globe protective ground. Tie the ground wire to the bench to keep it out of the fashion and neat. You may cut and strip the ground wire to a shorter length and attach it with an extra ring terminal if required.

  Note : DO Not DAISY CHAIN. Because of the loftier resistances inherent to many types of protective surfaces, daisy chaining of these materials can crusade the overall resistance to exceed the required limit of EN 61340-5-one.

  

  ESD working surface should never be grounded in serial, i.e. daisy chained

• If your kit includes a flooring mat, yous should indistinguishable step two and adhere the floor mat ground to the same footing betoken equally the working surface ground.
• Measure the resistance from the ground snap on the mat to the common ground betoken. It should read i megohm ±twenty percent if yous are using a basis string with a resistor, and less than 10 ohms if yous are using a basis string without a resistor.
• If you have a surface resistance or resistance to footing tester available, yous may wish to test the resistance to footing from the mat surface. Note: depending upon the accurateness of the musical instrument you are using, you may get a broad range of results in resistance to ground tests. In club to go the electrical readings specified per EN 61340-2-three, two two.2kg electrodes are to be used. This will require a megohmmeter with 100 volt open test circuit voltage and two 2.2kg electrodes.
• If you are using a mat kit that includes the wrist strap, install the wrist strap direct to the mutual bespeak mat ground string. Once more, test the resistance from the backplate of the wrist strap to the mutual footing betoken. It should read 1 megohm ± 20 percent.

  

  Adding a Wrist Strap

• Your completed installation of an ESD workstation should comply with i of the electric diagrams illustrated below.

Proper wiring diagrams for conductive and dissipative ESD workstations

6. Maintenance and Cleaning For optimum performance, periodic cleaning is required following the manufacturer's recommendations.Exist SURE YOU Test ALL GROUNDS AND THE WRIST STRAP FREQUENTLY

Desco Europe is the newest brand in the Desco Industries family, consolidating our two previous Great britain-based brands, Charleswater and Vermason. Desco Europe sells the total range of DII products, manufactured in our facilities in the USA and UK, servicing the European market via trained distributors who will sell the Desco Europe value packet and complete ESD solution to all ESD users in their territory, leading with hi-cease solutions that mark u.s.a. out from the contest.

How To Set Up Esd Mat,

Source: https://www.rs-online.com/designspark/6-steps-to-choosing-and-installing-an-esd-working-surface

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