Basic knowledge of anti-static wrist strap
People working in static-sensitive equipment and components wear anti-static wrist straps to prevent them from accumulating charges on themselves, which may be transferred to static-sensitive objects. Usually, wrist straps are used together with other anti-static measures to keep the items to be handled in a static-free environment, in which electrical charges that may damage components can be safely dissipated. When a person moves to generate static charges, it is necessary to provide a safe grounding path for the charge, and an anti-static wrist strap can achieve this.
Typical examples of anti-static wrist straps Typical examples of anti-static wrist straps Basic knowledge of ESD wrist straps ESD wrist straps are worn by operators who operate electronic products and provide a high-resistance ground path and in this way prevent static electricity from accumulating Will damage electronic circuits.
The anti-static wrist strap must not be directly grounded. Instead, the connecting wires have built-in resistors. This has two functions:
Dissipated power: One of the reasons for grounding a series resistor from an antistatic wrist strap is to provide a leakage path for any static electricity buildup. Slow discharge can prevent damage caused by sudden electrostatic discharge.
Provide safety: More importantly, the series resistance in the lead provides safety for the user. In the unlikely event of a direct connection to a high voltage by mistake, a resistance of usually 1 MΩ will prevent a serious electric shock. If the wrist strap is wrapped around the user's wrist, it may cause serious danger. Beware: Some coil leads may not have built-in resistors. When using new wires, these wires may not be originally used for ESD applications, or may come from unknown sources, please check if the wires have built-in resistors. If a wristband tester is used, the problem should be flagged. Usually, the wrist strap is connected to a workbench or other suitable grounding point by a wire. The wire is also coiled in a spiral shape, allowing the user to move freely. Coiling can prevent the lead from trailing the work piece and also make it more convenient to use.
Typical examples of ESD wrist straps with leads Typical examples of ESD wrist straps with connecting wires Although there are many types of anti-static wrist straps, they usually have an outer surface made of non-conductive materials and an inner surface that is conductive. Silver yarn is usually used.
There are usually two types:
Use 10mm snap connectors: One version uses 10mm snap connectors at both ends of the lead. One snap-on connector is mounted on the wrist strap, the other snap-on connector uses the same connector, and another 10mm snap-on connector is used to connect to the desktop/mat/power ESD connection point. This makes the two ends of the wire the same.
Use Alligator Clip/Alligator Clip: On some versions, the alligator leather uses a snap connector on one end and an alligator clip on the other end. This allows the anti-static wrist strap to be connected to various grounding points. The bent wire grounds the wrist strap. The bent wire grounds the wrist strap. The crimped wire makes the wire compact and will not become an obstacle. The anti-static wrist strap is an indispensable component in any anti-static workstation or work area. They prevent users from accumulating static charges, which can damage any electronic components or components in use.