Turning watches into ESD wrist straps
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It turns out you can turn just about any watch into an "antistatic" wrist band. More accurately, an anti static wrist strap, or ESD band is a tool for safely discharging electrostatic buildup. It doesn't actually prevent static buildup from happening, it just keeps the discharge current to a safe level.
ESD buildup can destroy your test equipment as well as your boards / devices under test. It's critical to follow proper ESD protocols for your specific situation.
A proper ESD strap should have a 1 MOhm resistance between the strap and ground. It should also have a high resistance outer band and a low resistance inner lining. The high resistance outer prevents accidental discharge from contact with high voltage or mains. The low resistance inner strap gives your skin a good connection to strap, enabling proper electrostatic discharge.
You should also work on a grounded ESD surface, use ESD-safe bags when transporting boards, and keep charged materials at least 0.3 meters away from exposed assemblies.
If you want to learn more about how to protect your test gear from ESD, check out this video:
https://youtu.be/dDvue5whx0s00:00 Why I hate ESD straps, and why I still use them
01:32 Sign up for a Keysight University course
02:05 Turning a calculator watch into an ESD wrist strap
07:48 Turning a Rolex into an anti static wrist strap
12:11 anti static strap resistance and how they work
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https://www.youtube.com/watch?v=f3nBl2DrAEA