How do ESD testers work?
Even the best ESD equipment will not protect anything if it is not checked regularly. ESD testers are therefore part of the basics of every EPA.
What is an ESD tester and why is it important?
A measuring device for checking the function of ESD protection elements – grounding of people, wrist straps, shoes, floors and work surfaces.
How do they work?
They measure electrical resistance, the continuity of the connection and the resistance to ground, and compare the values with set limits.
Types of testers
Wrist strap testers
The most common, used several times a day.
Footwear testers
Checking the person–shoe–floor system, often at the EPA entrance.
Combined testers
Wrist straps and shoes at the same time.
Surface resistance meters
For benches, mats and floors.
Monitoring systems
Continuous automatic checking, especially in automotive and semiconductors.
What can be measured and how often?
Wrist straps and shoes daily, surfaces and floors regularly – according to the ESD program measurement plan and ČSN EN 61340-5-1.
Common mistakes
Irregular checking, missing records, incorrectly set limits or faulty cables. The article how an ESD audit works shows how a full check is done.
Conclusion
Testers make ESD protection measurable and verifiable. A separate article helps with choosing ESD shoes; find more guides in the ESD Guide.