What Is The Esd Mat Resistance

The esd surface resistance test meters are used to measure the resistivity of the esd work surface mats and floor mats.
What is the esd mat resistance. Examples of these are packaging esd protective clothing and personnel grounding equipment. The esd wrist strap test meters verify a continuous path between the wrist band and a coil cord. The speed is referred to as the resistance of the material i e. The grounding conductors wires from wrist straps worksurfaces flooring or floor mats tools fixtures storage units carts chairs garments and other esd technical elements may or may not.
The esd protective symbol should be used to identify items that are specifically designed to provide esd protection for esds items. They are designed for electronic repair or assembly facilities to protect esd sensitive components during the soldering process. For esd control purposes materials are classified by how quickly electricity moves through the material. The esd association grounding standard ansi esd s6 1 recommends hard ground with no resistor for mats etc however a resistor is permissible.
The lower the number the more conductive the material and may be considered. Without the 1 meg resistance the static discharge would be an instantaneous drain directly to ground through the product. Since static exists on the surface of an object what we want to test anti static mats for is their ability to dissipate static on their top surface or work surface. Esd soldering mats made in usa.
Esd test meters include esd surface resistance test meters and esd wrist strap test meters. The speed is measured in ohms and is typically displayed in powers of 10 example 10 3. The ansi esd association standard used in the united states to test that an esd mat is static dissipative is ansi esd s4 1 worksurfaces resistance measurement s. Point to point resistance is 10 8 10 9 ohms and point to ground resistance is 10 5 10 6 ohms.
When measuring esd product such as esd mat resistance i have noticed that the resistance measures higher on some of my older esd rubber mats when using 10v and will sometimes be greater than 10 9 ohms. This requires the use of a surface resistivity esd meter to perform both resistance top to top rtt and resistance to groundable point rtg tests. Rtt testing for esd resistance per ansi esd s4 1. How strongly the material resists charge movement.
The esd protective symbol should also be used on items designed to replace static generative materials. Hence the title ansi esd s4 1 worksurfaces resistance measurements. Antistatic or esd mats have a high electrical resistance which allows the electrostatic discharge to flow across the surface of the mat at a slow rate enough to get the esd away from your electronics while at the same time neutralizing what little charge inevitably does build up.