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Notice: This information is a brief overview. For daily ESD simulator gun verifications and in-depth test information you will need to attain a copy of IEC 61000-4-2:2009.
Following parameters to be considered when verifying the pulse shape from the ESD generator with an oscilloscope:
An oscilloscope must use 0% and Max thresholds in order to perform the EMC-specific measurement.
Capturing the correct waveform with the scope can only be achieved with the proper settings of the DSO. The settings need to be made to measure pulses with +/-2kV, +/-4kV, +/-6kV and +/-8kV. Four parameters need to be measured at each voltage level:
- Initial peak current
- Rise time between 10% and 90% of the initial peak
- Current value at 30ns
- Current value at 60ns
The time domain for the initial peak and rise time measurement is recommended to be set to 1ns/Div. For the current measurement at 30nS and 60ns a setting of 10ns/Div is recommended as being appropriate.
Calculated from the impedance and attenuation values the following equation gives the proper ratio:
Ip = 5 x Vm
Vm is the voltage signal measured by the DSO in Volt
V1 is the voltage measured accros the CTR 2 target
Ip is the discharge current
V1 = 20dB x Vm = 2ohm x Ip
Ip = 20dB x Vm/2ohm
A discharge current of 7.5A will give a voltage reading of 1.5V on the DSO.
Using an oscilloscope and attenuators - verify the waveform coming off your ESD gun:
Note: Attenuator A should be 20 dB, Attenuator B (typically 10 dB) may not be required.