Lesson 5/1050%
MODULE 05

ESD Generator, Test Setup & Current Waveform

The ESD gun, the coupling planes it discharges through, and the exact shape of the current pulse it injects are all tightly specified by IEC 61000-4-2 -- understanding each piece is what makes a lab report readable and a design decision defensible.

Learning Objectives

🔫
Identify the parts of an ESD generator
🗺️
Understand HCP and VCP test setups
📈
Read Ip, I30, and I60 waveform parameters
🎚️
Explore how waveform scales with test level
🧰
Explain the purpose, physics, and variants of every test-bench component

Click each part of the generator below to see what it does.

Diagram: ESD Generator

A detailed, to-scale illustration of a typical handheld pistol-grip ESD generator -- digital kV display, polarity switch, trigger, interchangeable tip, and return-strap coil. Built as an illustration rather than a stock photo so licensing never becomes a problem and every label stays in sync with the part you select above.

Two indirect-discharge coupling planes let the standard reproduce nearby discharges without touching the EUT directly, simulating a spark near (not necessarily on) the product.

Engineer applying an ESD generator to a device on a bench with a vertical copper coupling plane behind it
A real bench setup: the ESD generator discharges to the EUT while a vertical coupling plane (the copper sheet behind) stands ready for indirect-discharge testing.

Animated: Test Setup

A compliant ESD test bench is more than just the gun -- every piece pictured in a typical IEC 61000-4-2 tabletop setup has a defined purpose, a physics reason for existing, and often more than one real-world variant. Select a component below for a detailed illustrated breakdown.

ESD Generator ("The Gun")

Purpose

Physics

Real-World Variants

    Component Typical Spec Key Physics Role
    ESD Generator 150 pF / 330 O network, up to 15-30 kV Produces the standardized Ip/I30/I60 current waveform
    Contact discharge tip Sharp pointed metal tip Direct, repeatable galvanic connection at the relay-defined instant
    Air discharge tip Rounded ball tip, larger radius Controlled, if less repeatable, air-gap breakdown geometry
    HCP 1.6 m x 0.8 m metal sheet Capacitive coupling path for indirect tabletop discharges
    VCP 0.5 m x 0.5 m metal sheet Capacitive coupling path simulating a nearby person/object
    Ground reference plane Copper or galvanized steel, extends ≥0.5 m beyond EUT Low-impedance common return reference for the whole setup
    Insulating table 0.8 m height, non-conductive Standardizes the HCP-to-GRP stray capacitance geometry
    Bleed resistors 470 kO, two per coupling plane Drain accumulated charge slowly without loading the fast transient
    Ground/bonding strap Short, wide braided copper Minimizes inductance in the generator's HF return path

    IEC 61000-4-2 specifies the exact current waveform a compliant generator must produce, defined by three parameters: the first peak current Ip (reached in a 0.7-1 ns rise time), the current at 30 ns (I30), and the current at 60 ns (I60). Select a test level to see the specified values.

    Level Test Voltage Ip I30 I60
    1 2 kV 7.5 A 4 A 2 A
    2 4 kV 15 A 8 A 4 A
    3 6 kV 22.5 A 12 A 6 A
    4 8 kV 30 A 16 A 8 A
    KNOWLEDGE CHECK

    Module 5 Quiz

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