User manual SESD 216 / SESD 230
281606
page 5 of 20
2
Introduction
The test generator SESD 216 / SESD 230 simulates "Electrostatic Discharge" as defined in the standard
IEC /EN 61000-4-2. The standard shows two test modes
a) Air Discharge
The discharge electrode with the domed point should first be connected to the SESD. The high voltage
discharge of the generator is into an air gap. The very short rise time of each single pulse generates a
wide RF spectrum and interference’s. This can be the reason for an influenced EUT.
b) Contact Discharge
The discharge electrode with a sharp point is connected to the EUT. The discharge switch is operated by
a vacuum relay allowing a better reproduction of the test results.
If the probe is not in contact with the EUT (e.g. varnished or oxidized surfaces) there will be no triggering
of impulses. The display will show "NO contact". This item makes sure that a discharge took place in the
contact discharge mode
Important!
The approach at air discharge has to be started from a distance of at least 20 cm, otherwise
there is the danger of multiple discharge at the single shot mode (discharge voltage can't rise high
enough and is recharged).
You can use the generator either with the built in batteries or with the mains operated power supply.
Automatic tests are available and easy to activate.
3
ESD - Definition
Drawing 1
Test
level
Test voltage
Air discharge
Test voltage
Con
discharge
Rise time
CON
(
±
25 %)
1. peak
current
(
±
15 %)
Current
30 ns
(
±
30 %)
Current
60 ns
(
±
30 %)
1
2 kV
2 kV
0,8 ns
7,5 A
4 A
2 A
2
4 kV
4 kV
0,8 ns
15,0 A
8 A
4 A
3
8 kV
6 kV
0,8 ns
22,5 A
12 A
6 A
4
15 kV
8 kV
0,8 ns
30,0 A
16 A
8 A
X*
special
special
* Level "X" is an open level.
Table 1: Severity level and waveform parameters at contact discharge
