IEC61000-4-2 Ed.2 Test Standard

For ESD Simulator ESS-S3011A & GT-30RA


1. General


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 fibers carpets or clothings are used in low humidity relatively. This standard assumes cases an charged human body discharges to electronic equipment and testing with the circuit to simulate current waveform generated in such conditions.

2. Test Level


Test level range for the ESD

The levels as below.

Level Test voltage (contact discharge) Test voltage (air discharge)
1 2kV 2kV
2 4kV

4kV

3 6kV

8kV

4 8kV

15kV

X Special

Special

* X can be any level determined by consent between the EUT manuracturer and the simulator supplier

3. Test Generator and Waveform Verification


Generator specification

The generator must satisfy following specification.

Energy accumulation capacity 150pF (typical)
 Discharge resistance  330Ω (typical)
Output voltage 8kV / Contact discharge, 15kV / Air discharge
Tolerance of output voltage ±5%
Polarity of output voltage Positive and negative (Switching available)
Hold time >= 5sec.
Discharge mode of operation Single discharges (Discharge interval >=1 sec)
Waveform of discharge current See right figure

Discharge current waveform and its characteristics


Generator characteristics

The characteristics in following table must be verified in order to compare the tests results even among different generators

Level Indicated voltage 1st peak current of discharge (±15%) lp

Rise time

(±25%)

Current

(±30%)

at 30ns

Current

(±30%)

at 60ns

1 2kV 7.5A 0.8ns 4A 2A
2 4kV 15A 0.8ns 8A 4A
3 6kV 22.5A 0.8ns 12A 6A
4 8kV 30A 0.8ns 16A 8A

Capacitance Cs : 150pF
Discharge resistance Rd : 330

Simplified diagram of the ESD generator


Waveform verification of ESD Generator

Measure the waveform with an oscilloscope whose band width is 2GHz or more upon use of Faraday cage and the current target. Attach the discharge electrode directly to the current target and operate the generator with the contact discharge mode.

* It is recommended that insertion of approx. 20dB attenuator for protecting the measurement equipment although it is not specified in IEC Standard.


4. Test setup


Example of test set-up for table-top equipment

The direct discharge test is electrostatic direct discharge to EUT and examine the influence.
Put a wooden table whose height is 0.8m on the ground plane and place horizontal coupling plate (HCP 1.6m × 0.8m).
Connect the HCP with resistor 470kΩ × 2 to the ground plane and lay a insulation sheet between the HCP and the EUT.
The indirect discharge test is electrostatic discharge to the HCP and vertical coupling plate (VCP 0.5m × 0.5m) and examine the influence of EUT. Connect the VCP with resistor 470kΩ × 2 to the ground plane as well.

* The isolation transformer for EUT is not specified in IEC Standard.


Example of test set-up for floor-standing equipment

Put an insulation pallet whose height is 0.1m onto the ground plane and place EUT on the pallet for the direct discharge test.
The indirect discharge test is electrostatic discharge to the VCP and examine the influence of EUT.
Connect the VCP with resistor 470kΩ × 2 to the ground plane as well.

* Float cables from the ground plane with 0.5mm thickness insulation sheet.
* Keep GND cable of the discharge gun ≧ 0.2m from any conductive parts other than the ground plane
* The isolation transformer for EUT is not specified in IEC Standard.


Grounding method in JIS (Japan Industrial Standard)

Since the grounding method in Japan is different from the other countries, it is specified in JIS (Not done in IEC61000-4-2)

2-line power supply (for table-top EUT)

3-line power supply (for table-top EUT)

2-line power supply with ground terminal (for table-top EUT)


5. Test Procedure


Climatic and Other Environmental Conditions

It is necessary to leave equipment which are 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 IEC61000-4-2.

Ambient temperature 15ºC to 35ºC
Relative humidity 30% to 60%
Atmospheric pressure 86 kPa (860 mbar) to 106 kPa (1060 mbar)
Electromagnetic conditions Level not to affect the test result

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 longer 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.

6. 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 specification
  2. Temporary degradation or loss in the operation or the function which is able to be recovered by a self-recovery function
  3. Temporary degradation or loss in the operation or the function 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 specification after testing, the test result can be perceived as "Pass"
The test report shall contain the test conditions and the result.

 

Notes : This test procedure and test set-up are extracted from IEC61000-4-2 (2009) and JIS C 61000-4-2 standardsed.2.0 (2005) Standard for applying to our products.
Please go through the Standards if the more details are required.

For further optional item information, please contact us.

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