ESD workbench: how is the work surface made dissipative and grounded?
An ESD workbench has a dissipative work surface or an ESD mat that is grounded via a common earth bonding point. The frame should be groundable so the whole bench is ESD-safe. This guide shows the resistance values to DIN EN 61340-5-1 and the path to ground.
View ESD workbenchesWhat makes a bench an ESD workbench?
An ESD workbench differs from an ordinary bench through a dissipative work surface and a groundable frame. The surface - a dissipative worktop or an ESD mat on top - is routed via a ground cord to a common earth bonding point (EBP) and from there bonded to protective earth.
The decisive factor is the resistance to ground: the surface must drain charges in a controlled way, not short them instantly. That is why the required range lies between 106 and 109 Ω. This keeps the workstation part of the EPA and protects sensitive components from discharges.
- Dissipative worktop or ESD mat as the work surface.
- Grounding kit with snap and 1 MΩ cord from surface to EBP.
- Groundable metal frame, bonded to the EBP or protective earth.
- Common grounding point for surface, wrist strap and floor.
Which resistance values does DIN EN 61340-5-1 require?
The standard defines a resistance range to ground for each element of the bench. The table below summarises the key requirements for the work surface and its grounding.
| Requirement | Element | Value |
|---|---|---|
| Surface to ground (Rgp) | worktop / ESD mat | 106-109 Ω |
| Point to point (Rp-p) | mat surface | < 109 Ω |
| Ground cord | surface to EBP | typ. 1 MΩ in series |
| Frame | metal frame to PE | conductive, groundable |
The 1 MΩ resistor in the ground cord is a personnel-safety measure, not a substitute for the surface resistance. The surface itself must meet the required 106‑109 Ω to ground - verified with a resistance meter and electrodes.
How does the bench fit into the ESD workstation?
The bench is the work surface of the ESD workstation, but it is not sufficient on its own. Only together with personnel grounding and - for standing work - a dissipative floor does it form a complete, grounded workstation within the EPA.
Frequently asked questions
Is an ESD mat on an ordinary bench enough?
A grounded dissipative ESD mat makes the work surface ESD-safe, provided it is routed to the EBP via a grounding kit. For a full ESD bench the frame should also be groundable and combined with personnel grounding.
Why must the surface not be metallically conductive?
A too low-resistance surface would discharge components instantly. The 106‑109 Ω range provides controlled, slow dissipation and so protects sensitive electronics.
How is the bench grounded?
Surface, frame and personnel grounding run in a star to a common earth bonding point (EBP) that is bonded to protective earth (PE). The surface cord usually contains a 1 MΩ resistor.
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