By John Papiewski
Updated Mar 24, 2022
An antistatic mat employs a conductive polymer to dissipate static charges from a work surface. Its surface resistance typically ranges from 1 MΩ to 10 GΩ. Standard multimeters lack the range to measure such high resistances, so professionals use specialized ESD meters. Over time, dust and grime can alter resistance; periodic testing with an appropriate meter informs cleaning or replacement decisions.
Place the mat on a clean, level, non‑conductive surface.
Power on the ESD test meter. Attach one probe to the mat’s metal grounding rivet or clip, and the other to the opposite corner of the mat’s top surface.
Observe the meter. Most meters display a resistance value; others show LEDs for “good,” “high,” and “low.” A properly functioning mat should read between 1 MΩ and 10 GΩ, or illuminate the “good” LED.
Remove the probes. Touch the metal end of one probe to an edge point and the other to the opposite edge. Move the probes around the perimeter, always spanning the full width. Consistent readings or a steady “good” LED confirm proper resistance. If readings drift, clean the mat with a mild detergent and retest.
Rectangular mats show variation in resistance readings due to probe distance; values may vary up to five times but should remain within 1 MΩ–10 GΩ.
