IEC 61000-4-2 Ed.2 Test Standard

* ISO 10605 ed.2 test standard is also described after the description on IEC 61000-4-2

The international immunity test standard which applies to electronic equipment against ESD generated directly from a human body or near metal objects in condition chemical fiber carpets or clothings are used in low hhumidity relatively. This standard assumes cases an charged human body discharges to electonic equipment and testing with the circuit to simulate current waveform generated in such conditions.

Test level range for the ESD

Generator specification

discharge current waveform and its characteristics

Generator characteristics

waveform verification of ESD generator


Grounding method in jis (japan industrial standard)

climatic and other environmental conditions

It is necessary to leave equipment brought in from different climatic conditions fully before performing the test. Also, in order to stabilize the discharging condition certainly, it is necessary to fix the climatic conditions in the test room. Fulfillment of the conditions listed in following table must be required to perform testing in conformance with IEC 61000-4-2.

Test Procedure

Direct discharge test:  Contact discharge (at 1 second interval ) and air discharge

Indirect discharge test:  Discharge to VCP and HCP

At least 10 single discharges shall be applied at 1 second or linger interval in both positive and negative polarities.

* A preliminary test which discharges 20 times or more per second may be done in order to select the points to which single discharges should be applied.

evaluation of test results and test report

The tests results are classified into following 4 patterns according to specifications of EUT and operating conditions.

1. Normal operation within the tolerance of the spefication

2. Temporary degradation or loss in the operation or the function which is able to be revocered by a self-recovery function

3. Temporary degradation or loss in the operation or the funcition which needs to be recovered by user intervention or reset in the system

4. Damage of the system (parts) or software, and unrecoverable degradation in the function due to loss of the data.

Generally, as far as the EUT is immune to the ESD during testing and it satisfies the functional requirements according to the product sepcification after testing, the test result can be perceived as "Pass". The test report shall contain the test conditions and the result.

Note:  This test procedure and test set-up are extracted from IEC 61000-4-2.

ISO 10605 Ed.2 Test Standard

Electrostatic discharges which are generated both in vehicles and while we get on and off there can be factors to cause malfunction of the electrical devices and components. Nowadays, more attention has been paid, as vehicles install more and more electronic devices and components. This standard provides that static electricity is discharged to the electronic devices or equipment from the charged human body and tests are simulated by electrical circuit to reproduce the electric current waveform at the discharge.

In addition to procedures for the immunity tests and evaluations in state that the electronic devices or equipment work while the vehicle is driving, also the standard provides tests procedures to evaluate the immunity of the each module against simulated human discharges during the assembly process or in servicing.

Test level

The following tests level are reference. The categories are classified according to functional importance of the electronics devices/components.

Specification of ESD simulator

Following specifications must be satisfied with the simulator for the test.

Contact discharge mode current specifications

Following discharges characteristics should be verified.

Verification of output current waveform

The waveform shall be verified with an osilloscope whose bandwidth is 1GHz or more in a Faraday cage or with a 1.2m x 1.2m metallic board mouting an ESD current target in the center of the cage or the board. The discharge electrode (Discharge tip of the gun) shall be touched onto the target and the discharge mode shall be set at the contact discharge mode. The discharge return cable shall be turned up the center of the length and connected to vertically 0.5m under the target on surface of the Faraday cage or board.

Test setup and test procedure

For testing powered DUT immunity to direct ESD - contact discharge and air discharge -

  • Capacitance shall be selected to 150 pF (In case of r components accessible from outside vehicle) or 330 pF (In case for components accessible from inside vehicle) and resistance shall be 330 ohm.
  • The test level shall be two or more.
  • At least 3 discharges shall be applied both to the positive and negative polarities with the interval not less than 1s. The time interval between successive signal discharges in the indirect discharge shall be longer than 50 ms and the number of the test shall be > 50 times.
  • In the contact discharge, it shall be done to wherever human finger may touch.
  • In the aire discharge, the speed of the DUT when possible; if not possible, an angle of at least 45 degree to the surface of the DUT is preferred.
  • Insulating blocks shall be used for DUT which is not grounded to the chassis directly.

For testing powered DUT immunity to indirect ESD

For testing (unpowered) packaging and handling ESD sensitivity

  • Capacitance shall be selected to 150 pF ( Although the resistance value is not provided, it is recommended to perform the tests supposing both resistance when the DUT may be directly acessible by human body (2k ohm) and it may be accessible by a metal object a human hold (330 ohm))
  • The test level shall be two or more.
  • At least 3 discharges shall be applied both to the positive and negative polarities with the interval not less than 1s.
  • In the contact discharge, it shall be done to wherever human finger may touch.
  • Charge build-up should be eliminated by briefly connecting a bleeder wire with high resistance (>1M ohm) after the discharge and the DUT shall be turned on. Afterwards, normal operation of it shall be confirmed.

Vehicle test - Internal and external points

  • Choose a generator capacitance of 330 pF for areas that can easily be accessed only from the inside of the vehicle and resistance of 300 ohm or 2k ohm.
  • Choose a capacitance of 150 pF for points that cna easily be touched only from the outside of the vehicle and resistance of 300 ohm or 2k ohm.
  • The ESD generator ground shall be connected to chassis like the seat-rain in case of the interior test or connected to a metallic plate under the wheel closest to the application point in case of the exterior test.
  • Both the contact discharge and air discharge shall be done both for the internal and external.

Optional test set-up and procedure for electronic modules (powered-up test)

- Direct and indirect discharge -