When developing a dependable product, the ESD test is always necessary for checking and ESD hazards. ESD tests are carried out using ESD generators or simulators. You may call them guns since their form is like a weapon. ESD guns have various voltage variants, such as 15kV, 16kV, 30kV, or more.
Why is this test required?
Well, you will learn about why the ESD test is required and how many models it has.
Human body model (HBM)
This ESD model is one of the earliest utilizes and tries to represent a person who has collected static load and dissipates it to the test equipment. The setup for this test is to load a 100pF condenser and then unload it through a 1,5K ohm DUT resistor.
An ESD simulator with a specific output circuit. The human body model (HBM), is frequently uses for evaluating the susceptibility of electrical equipment to ESD from human touch. This comprises a condenser with a resistor in series. The condenser is charges from an external source at a predetermined high voltage and then abruptly discharged through the resistor into an electrical terminal of the item under test.
Machine model (MM)
The test setup of the Machine Model was designing to simulate charges on equipment or materials then discharged. The load may be accumulates on equipment in assembly lines or even in packaging during the production process. The test setup comprises of charging a 200pf and unloading it to the device using a 500nH inductor. No series resistance exists; therefore, the charge pulse’s pulse width is typically considerably shorter, and the current may be much worse than the HBM.
Charge devise model (CDM)
This test may be doing in a batch or on a single component. The objective of this test is to determine whether the test equipment acquires load and is discharging to a ground plane. The test comprises a pin or portion of a device loaded at a specific voltage. The gadget is separates from a ground plane and is discharges by 1 ohm to the ground plane after charging.
A charged device model (CDM) test is performer when the machine itself contains an electrostatic charge and discharges due to metal contact to characterize the ESD of a device. This kind of discharge is the most frequent form of ESD in electronic equipment and causes most ESD damage in its production. The discharge of CDM is primarily dependent on parasite discharge parameters and significantly relies on component size and type. The JEDEC is one of the most often utilizes CDM simulation test models.
What issues might ESD equipment solve?
Electrostatic discharge for most individuals outside the industrial and production sectors is just an irritating and ultimately harmless occurrence in daily life. For example, after pressing a doorbell, you receive a small jolt or get out of the vehicle. For businesses and industrial facilities, the same cannot be accurate. Since the 1400s, ESD has raised issues. In a weird irony, humankind had to deal long before it could utilize electricity as a source of energy with the hazards of static electricity. LISUN has the best equipment for ESD tests.
ESD equipment aims to actively neutralize the danger of static electricity by preventing ESD occurrences, safe unloading of static charges, and protecting the environment. ESD equipment, in particular, is designed to:
- Prevent static electricity build-up
- Safely unload any static electricity produced
- Protect people and goods from adverse discharge consequences