ESD Tester

Electrostatic discharge (ESD) is a significant factor in both the premature failure of electronic equipment and the ignition of explosive devices. ESD has become a common cause of microelectronic circuit failure.   Since it is not always possible to control the environment where electronic or explosive devices are used, the burden of product reliability falls upon the manufacturer to design and build equipment that will reduce its susceptibility to ESD. Common specification Items Descriptions Operating power AC 110/220 ±10 % at 50/60Hz Voltage range(adjustable power supply) 0.1 ~ 40 KV(pulse)( depends on user's option ) Accuracy of output Setting value± 10% Charge capacitor 300 pF~ 0.1pF(option) Discharge resistor Option N.B) Detailed specification is depending on user's option.Basically, ESD simulator consists of a variable H.V power supply, H.V switch and capacitor network to simulate a specific electrostatic discharge from human body, a machine or device.The relevant specification describes a unique waveform characteristic resulting in different ESD susceptibility levels for each model.   Technical specification Mechanical scheme of ESD Some devices may be more readily damaged by discharges occurring within automated equipment, while others may be more prone to damage from handling by personnel. Basic Machine Model Circuit of ESD Typical Machine Model Circuit Photo shows a mechanic model circuit of ESD, and is similar to HBM.According to the variable ESD occurrence, above circuit parameters (discharge circuit, voltage and charge capacitor) is quite different. So, these circuit factors depend on user's option or kinds of products. ESD test procedures Make-up of TesterHBM (Human Body Model)MM (Machine Model)CDM (Charged Device Model) Develop and measure suitable on-chip protection. Enable comparisons to be made between devices. Provide a system of ESD sensitivity classification to assist in the ESD design and monitoring requirements of the manufacturing and assembly environments. Have documented test procedures to ensure reliable and repeatable results. Devices failure models and device test methods define the sensitivity of the electronic devices and assemblies to be protected from the effects of ESD.