Purpose
This test is for electrical and electronic equipment subjected to electrostatic discharge (ESD) from operators/personnel directly touching equipment or being adjacent to the equipment
Contact Discharge Test Levels and Waveform Parameters
Test levels - all lower test levels must also be satisfied, i.e., if the test specification is 6 kV contact, then 2 and 4 kV must also be applied.
|
Level
|
Indicated voltage [kV]
|
First Peak current of discharge [A] (± 15%)
|
Rise time tr with discharge switch [ns] (± 25%)
|
Current at 30ns [A] (± 30%)
|
Current at 60ns [A] (± 30%
|
|
1
|
2
|
7.5
|
0.8
|
4
|
2
|
|
2
|
4
|
15
|
0.8
|
8
|
4
|
|
3
|
6
|
22.5
|
0.8
|
12
|
6
|
|
4
|
8
|
30
|
0.8
|
16
|
8
|
The reference point for measuring the time for the current at 30ns and 60ns is the instant when the current reaches 10% of the 1st peak of the discharge current when measured into a target.
NOTE: The rise time tr is the interval between 10% and 90% value of the 1st peak current.
CURRENT WAVEFORM
Applying the ESD test
• Points of application - all points that are accessible to the user in normal operation; not necessarily pins of open connectors nor points accessible only during maintenance or servicing.
• Application method - contact discharge is preferred; air discharge is used where contact cannot be applied; both direct discharges to the EUT and indirect discharges to the coupling plane(s) are required.
• Non-earthed apparatus - should be deliberately discharged between each pulse, e.g. via connection of bleed resistor or by air ionization.
• Number of discharges - normally ten in each polarity to each point of application – EN 55024 requires a total of 200, 50 at each point.
• Mode of application - test generator must be perpendicular to the surface of the EUT; for air discharge, the tip must approach the EUT as fast as possible without causing mechanical damage; for contact, the tip must touch the EUT before the discharge is cancelled.
Test setup
Table top EUT insulated from HCP - click image to enlarge
Floor standing EUT - click image to enlarge
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