EMC-PARTNER IMU4000, User Manual

Page: 88 / 104

Appendix and Corrections
88/104
13.1.2 Definition of the ESD Waveform
IEC 61000-4-2 Ed.2
Level
1
2
3
4
Test
voltage
kV+-5%
2
4
6
8
Peak
current
A+-15%
7,5
15
22,5
30
Amplitude
at
30ns
A+-30%
4
8
12
16
Amplitude
at
60 ns
A+-30%
2
4
6
8
0,5
0,3
0,9
30ns +-30%
5ns +-30%
t
A
I
0,1
0,9
0,7 to 1ns
t
I fi rs t Peak
I m ax at 30ns
I m ax at 60ns
It is only possible to check the impulse current by using very expensive measuring equipment. The price of
such an instrument today lies at approx. 50 k$. In addition, persons who carry out such tests must have
some experience with high voltage and high frequency test work, so that they can interpret the measured
values. The calibration and verification of the generators must be carried out by the manufacturer or the
official calibration authorities.
Measurement of ESD current
wall cage
2 Ohm Target
50 Ohm
Termination
Attenuator
e.g. 20 dB
Oscillograph
50 Ohm
u2
u1
ESD-Mouse
IEC 61000-4-2 Ed.1
The ESD-current produces on 2 Ohm Shunt a voltage drop u1. The 2 Ohm target is terminated with 50 Ohm
to avoid reflection. With the 20 dB attenuator the 60V trop on the 2 Ohm will be reduced to the allowed input
voltage of the oscilloscope. The memory oscilloscope must have a minimum bandwidth of 1 GHz. For all
four levels (2,4,6,8 kV) the current wave-form must be within the tolerances as specified in the IEC standard
61000-4-2.
IEC 61000-4-2 Ed.2
The ESD-current produces on 2 Ohm Shunt a voltage drop u1. The 2 Ohm target is no longer terminated
with 50 Ohm. To avoid reflection the attenuator must be inserted on the target side. With the 20 dB
attenuator the 60V trop on the 2 Ohm will be reduced to the allowed input voltage of the oscilloscope. The
memory oscilloscope must have a minimum bandwidth of 2.5 GHz. For all four levels (2,4,6,8 kV) the
current wave-form must be within the tolerances as specified in the IEC standard 61000-4-2 Ed.2.
Current peak