Schloder SESD 200 User manual

OPERATION MANUAL
ESD - GENERATOR
SESD 200

User manual SESD 200 page 2
OPERATION MANUAL
ELECTRO STATIC DISCHARGE
GENERATOR
SESD 200
130707
Warning:
This unit generates high voltages and is inherently dangerous. The local, national and all applicable
safety regulations must be obeyed for operation of this unit. The device must only be used by
experienced electric technicians, see VDE 0140. People using cardiac pacemakers should be excluded
from the test area.
Before using the generator please read this manual
and also the warnings to the safety points under item 1

User manual SESD 200 page 3
Contents
1. SAFETY REGULATIONS ..................................................................................................................4
1.1. WARNINGS ...........................................................................................................................................4
1.2. REDUCTION OF SAFETY .........................................................................................................................4
2. INTRODUCTION ................................................................................................................................5
3. ESD - DEFINITION.............................................................................................................................5
4. UNIT FUNCTIONS .............................................................................................................................6
4.1. FRONT PANEL FUNCTION .......................................................................................................................6
4.2. CASE ...................................................................................................................................................7
4.3. POWER SUPPLY ....................................................................................................................................7
5. DESCRIPTION OF FUNCTION .........................................................................................................8
5.1. ON /OFF -SWITCH ..............................................................................................................................8
5.2. OUTPUT VOLTAGE ADJUST.....................................................................................................................8
5.3. POLARITY .............................................................................................................................................8
5.4. MODE CON /AIR.................................................................................................................................9
5.4.1. Special function contact control ..................................................................................................9
5.4.2. Discharge voltage at AIR discharge............................................................................................9
5.5. REPETITION FREQUENCY .......................................................................................................................9
5.6. ADJUST PRE-SELECT COUNTER ...........................................................................................................10
5.7. CONTINUOUS DISCHARGE ....................................................................................................................10
5.8. LCD -DISPLAY...................................................................................................................................10
5.9. TRIGGER KEY......................................................................................................................................10
5.10. DISCHARGE RETURN CABLE .............................................................................................................10
5.11. DISCHARGE ELECTRODES FOR CON /AIR .......................................................................................11
5.12. CONNECTOR POWER SUPPLY ...........................................................................................................11
5.13. CONNECTOR FOR A TRIPOD..............................................................................................................11
5.14. ADJUST THE CONTRAST OF THE LCD -DISPLAYS .............................................................................11
5.15. SERIAL NUMBER ..............................................................................................................................11
5.16. GENERATOR RESET ......................................................................................................................11
6. POWER SUPPLY.............................................................................................................................12
6.1. CONNECTOR ESD GENERATOR ...........................................................................................................12
6.2. FUNCTION SELECT SWITCH ..................................................................................................................12
6.3. POWER -LED ..................................................................................................................................12
6.4. CHARGE -LED ................................................................................................................................12
7. CALIBRATION.................................................................................................................................13
7.1. TEST EQUIPMENT FOR THE CALIBRATION MEASUREMENT.......................................................................13
7.2. PROOF OF THE QUALITY OF THE ESD PULSE ........................................................................................13
8. ESD TEST FIELD.............................................................................................................................14
8.1. ABOUT WHAT'S WRITTEN IN THE STANDARD ..........................................................................................14
8.2. RECOMMENDATION FOR THE SET-UP OF A TESTING CORNER..................................................................15
9. TECHNICAL DATA..........................................................................................................................16
9.1. GENERATOR .......................................................................................................................................16
9.2. AIR -/CONTACT DISCHARGE ...............................................................................................................16
9.3. POWER SUPPLY ..................................................................................................................................16
10. SCOPE OF DELIVERY ....................................................................................................................16
11. BLOCK SCHEMATIC DIAGRAM ....................................................................................................17

User manual SESD 200 page 4
1. Safety regulations
1.1. Warnings
The test generator SESD 200 creates high voltage up to 16.500 Volts. The energy of this high voltages is
limited, but injury might be incurred if the probe tip is touched.
The handling of the generator is only allowed to experienced and instructed persons according to DIN
570105 / VDE 0105 part 1. Persons with a cardiac pacemaker are not allowed to handle this unit.
The use of the ESD generator assumes, like all measurement tasks and verifications, that the local and
branch specific directions are considered. Precautions should be taken that any part that carries high
voltage and can be touched should be shielded. This is important with both the ESD Generator and the
object under test.
While using the SESD 200 it must be sure that the ground / earth connection is fastened at the
generators ground and connected to earth potential.
The interference generator SESD 200 is according to its specifications designed only for
laboratory use in the industrial surrounding (tests in an Faraday’s cage).
1.2. Reduction of safety
If the unit has visible damage so that a save operation is no longer possible, it has to be set out of
operation. It has to be ensured against unauthorised usage. The unit has to be send immediately to the
manufacture / dealer with a description of the damage!
We warn against untrained staff opening the unit. There is high voltage inside EVEN WHEN
SWITCHED OFF. Your warranty will be void if the unit is opened.

User manual SESD 200 page 5
2. Introduction
The test generator SESD 200 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 test voltage can be varied from 200 V to 16,500 V. The
very short rise time of each single pulse generates a wide RF spectrum and interference’s.
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.
Important ! If the probe is not in contact with the EUT (e.g. varnished or oxidised 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.
3. ESD - Definition
Drawing 1
level
test voltage
air discharge
test voltage
contact dis.
rise time
(contact dis.)
1. peak
current
( ±10 %)
current after
30 ns
(±30 %)
current after
60 ns
(±30 %)
1 2 kV 2 kV 0,7 - 1,0 ns 7,5 A 4 A 2 A
2 4 kV 4 kV 0,7 - 1,0 ns 15,0 A 8 A 4 A
3 8 kV 6 kV 0,7 - 1,0 ns 22,5 A 12 A 6 A
4 15 kV 8 kV 0,7 - 1,0 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

User manual SESD 200 page 6
4. Unit functions
4.1. Front panel function
Drawing 2
1ON / OFF - switch
2Potentiometer output voltage adjust and special function
3Polarity of the pulse, positive and negative
4Mode CON / AIR - contact discharge or air discharge
5Repetition frequency
6Counter pre-selectable
7Continuous discharge
8LCD - Display

User manual SESD 200 page 7
4.2. Case
Drawing 3
4.3. Power supply
Drawing 4
[14] POWER - LED (green)
[15] CHARGE - LED (yellow / red)
[16] Function select switch for line using or charging
[17] Connector to ESD generator
[9] Trigger key
[10] Connector for the
discharge return
cable
[11] Discharge electrodes
for CON
[11] Discharge electrodes
for AIR
[12] Connector for the
power supply
[18]Connector for an optical
RS 232 Converter
[13] Connector for a tripod

User manual SESD 200 page 8
5. Description of function
5.1. ON / OFF - switch
After switching on the generator the LCD display shows the last used parameters. In accumulator mode
the generator should be switched off after usage.
5.2. Output voltage adjust
With the potentiometer the output voltages amplitude can be adjusted in the range of:
± 0,2 kV to 16,5 kV with test method "air discharge".
± 0,2 kV to 9,0 kV with test method "contact discharge".
The voltage value is shown in the upper line of the LCD display. The voltage can be changed in steps of
100 Volts by turning the potentiometer slowly. Turning the potentiometer fast will increase the voltage
steps.
On the left hand of the voltage display the respective test level "L1" to "L4" is shown.
5.3. Polarity
Referring to the standard tests the electrostatic discharges have to be tested in positive (+) and negative
(-) polarity. The display shows the chosen polarity on the left hand of the voltage value, "+" or "-".

User manual SESD 200 page 9
5.4. Mode CON / AIR
With this key the test mode can be changed between contact discharge and air discharge. While pressing
the key the display shows in the lower line the information "CON" or "AIR". Simultaneously the admissible
voltage ranges are changed - see point [5.2]. If the voltage display shows a "standard test level" like L1,
L2, L3 or L4 the voltage is changed according to the test modes specification.
Example: test mode CON test level L3 = + 6.0 kV.
test mode AIR test level L3 = + 8.0 kV.
Make sure that the right test tips are connected to the generator - air discharge "round" and contact
discharge "sharp".
5.4.1. Special function contact control
If the test mode is set to "CON" the triggering can only be released if the serial resistance in the test
circuit is smaller than 4 MΩ. In other cases the display shows "NO CONTACT".
At the level < 1 kV the display doesn’t show "NO CONTACT". Notice, in this case a discharge will be
done.
If you don’t want the function “contact control”, with the service menu you are able to switch ON and OFF
this function. Please ask the manufacturer or your dealer.
5.4.2. Discharge voltage at AIR discharge
In the test mode “AIR” and “Single” the “real discharge voltage” we can show in the display.
After the discharge and hold on the trigger key [9] the voltage in the display changes from the adjusted
voltage to the real discharge voltage. This voltage is shown as sparkled information.
For example:
Adjusted voltage: 12.0 kV -> after the discharge the value 9.7 kV is flashing.
That means the value 9.7 kV is the different value between the adjusted voltage (12.0 kV) and the
residual voltage of the discharge capacitor (2.3 kV)
5.5. Repetition frequency
By pressing the key a number of times the following repetition frequencies (shown on the right hand in the
lower line of the display) can be chosen.
Air discharge: SINGLE or REP (single pulse or repeated).
Contact discharge: SINGLE, 1 Hz, 2 Hz, 5 Hz, 10 Hz or 20 Hz.

User manual SESD 200 page 10
5.6. Adjust pre-select counter
After pressing the key the display shows "COUNTER SET CXXXX". The last selected value appears,
e.g. C1400. Using the potentiometer [2] the value can be changed from C 00 up to C9999. After pressing
the key again the displayed value is fixed in the pre-select counter.
When the charge is released, the counter counts down to zero, then no more impulses are released. For
further usage of the generator, the pre-select counter must either be programmed again or cleared. By
pressing and holding key [6] the pre-select counter will be cleared after the key is released.
5.7. Continuous discharge
For longer tests or if a tripod is used, the generator can be adjusted for automatic continuous discharge.
Operation: press and hold key "CONTINUOUS" [7]. Press trigger key [9].
Release keys [7] and [9]. The function "continuous discharge" is activated.
Switch off: press [9] - the function "continuous discharge" is switched off.
5.8. LCD - Display
The upper line of the two line display shows the test voltage in kV and polarity. The left side of the lower
line gives information about the test mode (CON / AIR), the right side shows the selected repetition
frequency. If the pre-set counter is activated the value is shown in the middle of the lower line.
Special information’s:
a) " BAT ": If this message appears in the upper line on the right hand, the built in battery
needs to be charged. See chapter 6.2.
b) " * " and " _ " : The " * "- sign in the left hand side of the upper line signifies "Attention! High
Voltage" at the test tip. The information is displayed as long as the trigger key [
9] is pressed. After releasing the key [ 9] the sign "_" appears for two or tree
seconds. During this time the high voltage is discharged internally. While the
symbol "_" is displayed, you should not try to change options.
5.9. Trigger key
With the key [9] the discharge is released. There are also special functions that are shown in previous
chapters.
5.10. Discharge return cable
The discharge return cable has to be connected to the ground connector [10]. The other end has to be
connected to ground, either to the ground plane of the test bay or directly to the EUT.