EMTEST EFT 500N5 Series Instruction Manual

M a n u a l
f o r O p e r a t i o n
EFT 500N5 / N8 series
EFT 500N5
EFT 500N5.1 / .2 / .3 / .4 / .5 / .6/ .7/ .8
EFT 500N8
EFT 500N8.1 / .2
EFT/burst generator pulse 5/50ns
EFT 500Nx series –an EFT/Burst generator –is an intelligent
solution offering exactly what you need for full-compliance
immunity tests against Electrical/Fast transients phenomena.
The distinct operation features, convenient EUT connection
facilities, a clearly arranged menu structure and display
philosophy as well as the pre-programmed standard test
routines make testing easy, reliable and safe.
Extendable by a variety of test accessories the EFT 500Nx is a
universal equipment for abroad range of recommendations even
for three-phase applications up to 100A
IEC 61000-4-4
IEC 61000-4-4 Ed 3
EN 61000-4-4
EN 61000-4-4 Ed 3
Version:
5.23 / 13.07.2016
The benchmark for emc
Replaces:
5.22 / 08.03.2016
Filename:
UserManual-EFT500Nx-E-V5.23.doc
Printdate:
13.07.16

EM TEST EFT 500Nx Series
Manual for Operation V 5.23 2 / 36
EM TEST (Switzerland) GmbH
Sternenhofstrasse 15
4153 Reinach BL1
Switzerland
Phone : [phone]
Fax : [phone]
URL : http://www.emtest.com
Copyright © 2016 EM TEST (Switzerland) GmbH All right reserved.
Specifications subject to change

EM TEST EFT 500Nx Series
Manual for Operation V 5.23 3 / 36
Content
1. Model Overview.............................................................................................................................................4
1.1. EFT Models......................................................................................................................................4
2. Operating Functions .....................................................................................................................................5
2.1. Front view.........................................................................................................................................5
2.2. Rear view.........................................................................................................................................6
3. Operation........................................................................................................................................................8
3.1. Description of the menus.................................................................................................................8
3.2. Main Menu .......................................................................................................................................8
3.3. Quick Start .......................................................................................................................................9
3.4. User Test Routines ........................................................................................................................10
3.5. Test Routine as per IEC 61000-4-4 (2004-07) Ed 2......................................................................12
3.6. Service...........................................................................................................................................13
3.7. Setup..............................................................................................................................................14
4. Test Equipment EFT 500N..........................................................................................................................15
4.1. Specification of the test parameters...............................................................................................15
4.2. Burst generation.............................................................................................................................15
4.3. Coupling decoupling network.........................................................................................................16
4.3.1. Coupling/decoupling network for ac/dc power lines.......................................................................16
4.3.2. Capacitive coupling clamp .............................................................................................................16
4.4. Burst Test Setup ............................................................................................................................17
4.4.1. Test setup with capacitive coupling clamp.....................................................................................17
4.5. Computer setup for EFT/Burst testing. ..........................................................................................18
5. Technical data..............................................................................................................................................20
5.1. EFT Electrical Fast Transients Burst as per IEC 61000-4-4.............................................................20
6. Maintenance.................................................................................................................................................22
6.1. General ..........................................................................................................................................22
6.2. Test set-up.....................................................................................................................................22
6.3. Fuse for the EUT power supply .....................................................................................................22
6.4. Calibration and verification.............................................................................................................23
6.4.1. Factory calibration..........................................................................................................................23
6.4.2. Guideline to determine the calibration period of EM Test instrumentation....................................23
6.4.3. Calibration of Accessories made by passive components only:....................................................23
6.4.4. Periodically In-house verification ...................................................................................................23
6.4.5. General information for verification................................................................................................24
6.4.6. Verification tests according standard.............................................................................................24
6.4.7. Specification of the pulse parameters............................................................................................25
6.4.8. Verification on coaxial output.........................................................................................................26
6.4.9. Verification on EUT output.............................................................................................................28
7. Delivery Groups...........................................................................................................................................29
7.1. Basic equipment EFT 500Nx .........................................................................................................29
7.2. Accessories and options................................................................................................................30
8. Appendix ......................................................................................................................................................32
8.1. Declaration of CE-Conformity........................................................................................................32
8.2. EFT 500Nx series - General Diagram ...........................................................................................33
8.3. EFT 500Nx - Overview...................................................................................................................34
8.4. EFT 500Nx - Overview 3-phase coupling......................................................................................34
8.5. USB Interface.................................................................................................................................35
8.6. EFT 500Nx Menu overview..........................................................................................................36

EM TEST EFT 500Nx Series
Manual for Operation V 5.23 4 / 36
1.
Model Overview
1.1.
EFT Models
Standard and special models
Special models have the index EFT 500Nx Sx . The difference to the standard models is the voltage or current
ranges. The operation is the same as by the standard EFT equipment’s.
Generator model
Model name
up to 2008
Description
EFT 500N5
EFT 500 M4
4.8kV Burst Generator with built-in CDN 250V 16A
EFT 500N5.1
EFT 500 M4 S1
4.8kV Burst Generator with built-in CDN 3x440V 32A
EFT 500N5.2
EFT 500 M4 S2
4.8kV Burst Generator with built-in CDN 3x440V 50A
EFT 500N5.3
EFT 500 M4 S3
4.8kV Burst Generator without CDN
EFT 500N5.4
EFT 500 M4 S4
4.8kV Burst Generator with built-in CDN 690V 32A
EFT 500N5.5
EFT 500 M4 S5
4.8kV Burst Generator with built-in CDN 250V 32A
EFT 500N5.6
EFT 500 M4 S6
4.8kV Burst Generator with built-in CDN 250V 32A
additional ext. CNE 503S16
EFT 500N5.7
4.8kV Burst Generator with built-in CDN 3x440V 16A
EFT 500N5.8
4.8kV Burst Generator with built-in CDN 3x690V 32A
EFT 500N8
EFT 500 M8
Burst Generator up to 7kV with built-in CDN 250V 16A
EFT 500N8.1
EFT 500 M8 S1
Burst Generator up to 7kV with built-in CDN 3x440V 32A
EFT 500N8.2
EFT 500M8 S2
Burst Generator up to 7kV with built-in CDN 250V 32A
No longer available models
The following models are no longer available on the sales list but still supported by maintenance and upgrade to
the actual standard.
Modell Pulse voltage
CDN
replaced by
EFT 500 4,4kV
3x440V 16A
3 - phase
EFT 500N5
EFT 503 4,4kV
3x440V 16A
3 - phase
EFT 503 M4 S6
EFT 503 S1 4,4kV
3x690V 16A
3 - phase
--
EFT 503 S2 4,4kV
3x440V 32A
3 - phase
EFT 500N5.1
EFT 503 S3 4,4kV
3x440V 50A
3 - phase
EFT 503 M4 S2

EM TEST EFT 500Nx Series
Manual for Operation V 5.23 5 / 36
2.
Operating Functions
2.1.
Front view
1Display
2"Test On"
3Function keys "F1..F7"
4Knob (Inc / Dec)
5Cursor keys "" and ""
6Exit
7Escape
8CRO
9 HV pulse output 50 ohm
10 Ground reference
11 Coupling “On”
12 EUT test supply
1 Display
All functions and parameters are displayed (8 lines with max. 40 characters).
2 Function keys "F1 .. F7"
Parameters and functions, displayed in the lowest line, can be selected with the related function key.
3 Test On
By pressing the key "Test On" the test procedure is initiated with the preselected parameters. The red LED
indicates the trigger of a burst event.
4 Knob (Inc / Dec)
The knob increments or decrements test parameters with a numeric value or selects from a list of parameters.
5 Cursor keys
Parameters and functions can be changed on-line. The selection of these parameters is realized with the cursor
moving to the left or to the right.
6 Exit
Pressing of the Exit function will cause a reset of the firmware. This is only possible if no test routine is running.
7 ESC
When pressing the ESC button the user moves back one page in the menu.
8 BNC - CRO Trigger
At the BNC output the generator trigger can be checked, e.g. the burst duration, the burst repetition rate and the
spike frequency (+15 V rectangular). This output signal can also be used to trigger external measuring devices
(e.g. an oscilloscope)
9 HV pulse output 50 ohm
External coupling devices such as the capacitive coupling clamp and the coupling network CNE 503 are
connected to the coaxial 50 ohm output. Also the pulse parameters, on 50and 1000load condition must be
verified at this coaxial output.
10 Ground reference
During test or calibration procedure the burst generator must be grounded to the reference ground plane.
11 Coupling
The LED indicates that the pulses are coupled to the L –N –PE line.
12 EUT test supply
The coupling / decoupling network is part of the generator. The EUT is powered via the safety laboratory plugs
at the front panel of the simulator. The nominal power mains supply is 250V/16A. For higher currents, up to
100A, the external coupling network CNE 503 shall be used.

EM TEST EFT 500Nx Series
Manual for Operation V 5.23 6 / 36
2.2.
Rear view
1Voltage indicator
2EUT test supply input
3Ventilator
4Label for serial number
5External Trigger
6Power On switch
7 Mains selector 115V / 230V
8 Fuse holder
9USB Interface optical forN8 models
10 Remote control connector CN
11 Sync input
12 Reference ground connector
13 Mains plug
14 Safety circuit
15 Interface GPIB / IEEE 488
16 Fail input Fail 1and Fail 2
1 Voltage indicator
Glow lamp for phase detection. The glow lamp is connected to PE and indicates a correct phase connection.
Is the lamp not on, the voltage is off or the phase and neutral is inverse.
2 EUT test supply input
The power supplyfor the EUT is connected to the safety laboratory connectors + and -. The front panel output is
decoupled by the internal coupling/ decoupling network.
3 Ventilator
Behind the ventilator hole a free space of at least 10cm for device cooling is necessary.
4 Label for serial number
The serial number tag indicates additionally the operating voltage and used fuse sizes.
5 External trigger
One single burst event can be released. Trigger level 5-15V positive going.
6 Power on switch
The switch is part of the mains filter. Mains fuses are part of the filter. (230V / 1A and 115V / 2A)
7 Mains selector
Selection of 115V / 230V
8 Fuse holder
Mains fuse 2-pole (phase and neutral). Fuse 5 x 20mm (230V / 1A and 115V / 2A) slow blow
9 USB interface
USB interface “USB B” connector. For data transfer a USB interface is available. The internal RS 232 interface
is converted to USB standard. Therefore the user must set the same Baud rate in the device and control
software.
Using the USB interface the user can have emc problems during burst tests Our experiences says, that usually
the computer USB port is disturbed by interference’s. Therefore a high quality USB cable (USB 2.0 standard)
must be used. EFT 500N8 models are equipped with an optical USB interface
10 Remote control connector CN
To remote control an external coupling matrix CNE 503. All functions are controlled by the EFT 500. It is
recommended to connect and power the CNE 503 before turning the power mains ON at the EFT 500.

EM TEST EFT 500Nx Series
Manual for Operation V 5.23 7 / 36
1Voltage indicator
2EUT test supply input
3Ventilator
4Label for serial number
5External Trigger
6Power On switch
9 Mains selector 115V / 230V
10 Fuse holder
9USB Interface optical forN8 models
10 Remote control connector CN
11 Sync input
12 Reference ground connector
13 Mains plug
14 Safety circuit
15 Interface GPIB / IEEE 488
16 Fail input Fail 1and Fail 2
12 SYNC input
An ac voltage to which the events shall be synchronized is connected to
this input. If no voltage is available the tests are started automatically in
asynchronous mode with no phase angle adjust for pulse release.
Normally this input shall be connected directly to L1 plug.
The maximum input voltage is 300Vac.
12 Reference ground connection
The generator has to be connected to the reference ground plane of the test set up. Very important is the
connection at the front panel of the simulator.
13 Mains plug
C14 type plug, for ac mains power 115V/240V 50/60Hz.
14 Safety circuit
For connect an external security circuit.
15 Parallel interface GPIB / IEEE 488
IEEE 488 interface with IEEE connector.
16 Fail detection FAIL 1 (TEST STOP)
The BNC input FAIL 1 can be used for DUT monitoring. In case of a low going signal (to chassis ground) the
EFT 500 will stop pulse generation and the actual running test routine is paused. The test routine than can be
stopped completely or can be continued from break point.
A message of FAIL 1 is indicated in the LCD display as well as in the ISM ISO software.
Fail detection FAIL 2 (TEST PAUSE)
The BNC input FAIL 2 can be used for DUT monitoring In case of a low going signal (to chassis ground) the
EFT 500 will stop pulse generation and the actual running test routine is paused as long as the low level signal
is available at the FAIL 2 input.
The test routine continues automaticallyas soon as the low level signal goes to high level.
A message of FAIL 2 is indicated in the LCD display as well as in the ISM ISO software.

EM TEST EFT 500Nx Series
Manual for Operation V 5.23 8 / 36
3.
Operation
3.1.
Description of the menus
The simulator is operated by an easy menu control system. Seven
function keys are available to select parameters and functions. All
functions are indicated on the display; max. 8 lines and 40
characters.
The selected parameter is blinking and can be changed by turning the knob (incr. /dec.).
The takeover of the input value occurs after about 500ms encoder downtime. This allows
the operator a brief check of the correct input value.
 : The digit to be changed can be selected with the cursor ( ).
- Settled values are direct indicated on the screen.
- Status on the bottom lines shows the desired status after pressing the function
key.
ESC: ESC will take you back to the previous level in the menu and set the displayed
values. The latest settings are stored automatically and will be recalled when the
menu is selected again.
EXIT: The firmware will reset to the main screen.
EM TEST
EFT 500N5
Burst 5/50ns
V 5.00a01
SWN: 001234
The serial number and the version number SWN are
used for traceability reasons. These numbers are listed in
the test reports and calibration certificates. These
numbers also are listed within the test reports generated
by the ISM IEC software
Start-up display example EFT 500N5
3.2.
Main Menu
MAIN MENU
F1 : Quickstart
F2 : User test routines
F3 : Standard test routines acc
F7 : Service
F1
F2
F3
F4
F5
F6
F7
Quick Start
Easy and fast operation mode for equipment using without special functions. All parameters can be adjusted
during the running test.
User Test Routines
The user can program, save and recall customized specific test routines. He can select standard routines or
special functions such as automatic change of voltage or frequency during a test routine.
Test Routines as per IEC 61000-4-4
The user can call up the standard routines as per IEC 61000-4-4 and start them immediately.
Service
Set-up menu for the generator.

EM TEST EFT 500Nx Series
Manual for Operation V 5.23 9 / 36
3.3.
Quick Start
Easy and very fast operation of all standard functions of the equipment. The latest simulator settings are stored
automatically and will be recalled when Quick Start is next selected.
QUICK START
V = 2000V f = 5.0kHz
td = 15.0ms tr = 300ms
kop = L N PE +/- = +
T = 5:00min
START CHANGE
F1
F2
F3
F4
F5
F6
F7
Press CHANGE and the test parameters parameter can be changed.
Select the desired parameter with the related function key and change the value by turning the front panel knob.
The cursor allows the user to define the digit to be changed (fast or slow change).
Press START and the test starts immediately with the displayed test parameters.
The operator now can navigate with the Cursor from parameter to parameter. The blinking parameter can be
changed byturning the front panel knob.
Press ESC will bring the user back to the previous menu level.
Page 3 (Change)
QUICKSTART
Voltage V : 200V - 4400V
Frequency f : 0.1kHz - 1000.0kHz
Duration td : 0.1ms - 999.9ms
Repetition tr : 10ms - 9999ms
Test time T : 0:01min - 99:59min
U f td tr cpl +/- T
200 5.0 15.0 300 L N PE + 5:00
F1
F2
F3
F4
F5
F6
F7
After starting the test the elapsed test time is displayed. All function keys except F2 (manual trigger) can Stop the
test routine. After test stop (Stop, Test OFF), the display keeps for about 2s.
After starting the test the elapsed test time is displayed. All
function keys except F2 (manual trigger) can Stop the test routine.
After test stop (Stop, Test OFF), the display keeps for about 2s.
Press ESC will bring the user back to the previous menu level.
All function keys except F2 (manual trigger) can Stop the test
routine.
Burst specification as per IEC 61000-4-4 (2004-07) Ed 2
f = 5kHz 100kHz
td = 15ms 0.75ms
tr = 300ms 300ms
Warning
If the user reduces the test voltage in Quickstart, the storage capacitor will be discharged
only by the burst pulses. The result is a higher test voltage on the EUT than indicated on the
display till the storage capacitor is discharged to the settled value.
If the voltage reduction is several 100V the discharge time to the correct test voltage can be
some seconds. The discharge time depends on the repetition rate tr and the duration td of the
burst pulse.
Pressing STOP / START will discharge the storage capacitor over the discharge resistor
immediately. After the START the test will continue with the correct voltage level.

EM TEST EFT 500Nx Series
Manual for Operation V 5.23 10 / 36
3.4.
User Test Routines
The user can program, save and recall his own specific test routines. The next pages show the selection of the
functions.
USER TEST ROUTINES Page 1 / 2
USER TEST ROUTINES Page 2 / 2
F1 : Customized test routines
F1 : Change duration after T by dt
F2 : Voltage change after T by V
F2 : Change polarity after T
F3 : Frequency change after T by f
F3 : Statistical burst release
F4 : Frequency sweep in one single burst
F4 : Synchronized at fixed angle
Page 2
Page 1
F1
F2
F3
F4
F5
F6
F7
F1
F2
F3
F4
F5
F6
F7
Each of these special functions can include 7 stored test routines.
CUSTOMISED TEST ROUTINES
F1 : Store F1 F5 : Store F5
F2 : Store F2 F6 : Store F6
F3 : Store F3 F7 : Store F7
F4 : Store F4
F1
F2
F3
F4
F5
F6
F7
After selection of a stored test file the test parameters will be indicated on the display.
Customized test routines
The software controls standard test routines according to the specification of the user. All limitations are the same
as defined under Quick Start.
Voltage change after T by V
The test voltage is increased from V1 to V2 by steps of V
after the defined test time T. All limitations are the same as
defined under Quick Start. The limitation of the max.
generated number of spikes is related to the higher voltage
of V1 or V2.
Frequency change after T by f
The spike frequency is increased from f1 to f2, and then
from f2 to f3 by steps of f after the defined test time T. All
limitations are the same as defined under Quick Start. The
limitation of the max. generated number of spikes is related
to the higher frequency of f1, f2 or f3.

EM TEST EFT 500Nx Series
Manual for Operation V 5.23 11 / 36
Frequency sweep in one single burst
During one single burst the frequency sweeps from f1 to f2.
For this function the following limitations have to be
respected:
tr
>=
100ms
f1
<=
f2
td
>=
5.0ms
td
>=
5 / f1
tr -td
>=
50ms
Duration change after T by t4
The burst duration is increased from t4s to t4e by steps of 
t4 after the defined test time T. All limitations are the same
as defined under Quick Start. The limitation of the max.
generated number of spikes is related to the higher duration
of t4s or t4e.
Random burst release
No repetition rate is selected. The single burst will be
triggered randomly within the limits of 20 to 2000ms as time
between two bursts. All limitations are the same as defined
under Quick Start.
Polarity change after T
The polarity will be changed from + to - after the defined test
time T.

EM TEST EFT 500Nx Series
Manual for Operation V 5.23 12 / 36
3.5.
Test Routine as per IEC 61000-4-4
The display shows a list of test levels as per the standards IEC 61000-4-4. In the menu Service F4 Change
standard level you select between the burst frequency 5 kHz and 100 kHz.
N5 models Setting IEC 61000-4-4 Setting IEC 61000-4-4 Ed 2
STANDARD TEST ROUTINES
STANDARD TEST ROUTINES
F1 : Level 1 250 V / 5.0 kHz
F1 : Level 1 250 V / 100.0 kHz
F2 : Level 2 500 V / 5.0 kHz
F2 : Level 2 500 V / 100.0 kHz
F3 : Level 3 1000 V / 5.0 kHz
F3 : Level 3 1000 V / 100.0 kHz
F4 : Level 4 2000 V / 5.0 kHz
F4 : Level 4 2000 V / 100.0 kHz
F5 : Level 5 4000 V / 5.0 kHz
F5 : Level 5 4000 V / 100.0 kHz
F6 : Level X - Level Y
F6 : Level X - Level Y
F1
F2
F3
F4
F5
F6
F7
F1
F2
F3
F4
F5
F6
F7
N8 models Setting IEC 61000-4-4 Setting IEC 61000-4-4 Ed 2
STANDARD TEST ROUTINES
STANDARD TEST ROUTINES
F1 : Level 1 1000 V / 5.0 kHz
F1 : Level 1 1000V / 100.0 kHz
F2 : Level 2 2000 V / 5.0 kHz
F2 : Level 2 2000V / 100.0 kHz
F3 : Level 3 4000 V / 5.0 kHz
F3 : Level 3 4000 V / 100.0 kHz
F4 : Level 4 6500 V / 5.0 kHz
F4 : Level 4 6500 V / 100.0 kHz
F6 : Level X - Level Y
F6 : Level X - Level Y
F1
F2
F3
F4
F5
F6
F7
F1
F2
F3
F4
F5
F6
F7
The function key F5 selects a procedure which starts at test level X and stops at test level Y. The test level is
changed automatically after the preselected test time T.
(X <= Y)
Page 3 (Show values)
Standard IEC 1000-4-4 Level 3
The Standard defines the burst duration at
100kHz with 0.75ms. The EFT 500 generators
with firmware < V 5.10 support not a resolution of
0.05ms.
The burst duration at 100kHz is set to 0.8ms
which is inside the specified tolerance of the
standard of 0.75ms 20%
V = 2000V f : 100 kHz
td = 0.8ms tr : 300ms
kop = L N PE +/- : +
T = 1:00min
F1
F2
F3
F4
F5
F6
F7
The functions START, CHANGE and PRINT are the same as defined under Quick Start.
The function key CHANGE can only handle the coupling, polarity and the test time.
All other parameters are defined by the standard.
EFT generators with firmware V5.10 or higher have a td resolution of 0.01 ms an support the setting of 0.75 ms.

EM TEST EFT 500Nx Series
Manual for Operation V 5.23 13 / 36
3.6.
Service
SERVICE
F1 : Addresses
F2 : Selftest
F3 : Set-up
F4 : Change standard levels
F1
F2
F3
F4
F5
F6
F7
F1 Addresses
The addresses of the EM TEST (Switzerland) GmbH
and the EM TEST GmbH are shown. The addresses
of all EM TEST sales agencies are listed on the web
site of EM Test under :
www.emtest.com
F2 Selftest
Selftest for check the key functions.
F3 Set-up
The software will clearly explain the set-up procedure.
F4 Change standard levels
This procedure allows the user to change the standard values to his actual requirements.
The Burst Repetition frequency has the following rulers:
- IEC 61000-4-4 5 kHz 15ms
- IEC 61000-4-4 Ed.2 100 kHz 0.75ms
SERVICE
F1 : Change parameters Level 1
F2 : Change parameters Level 2
F3 : Change parameters Level 3
F4 : Change parameters Level 4
F5 : Change parameters Level 5
F6 : Change parameters IEC 61000-4-4
F7 : Change parameters IEC 61000-4-4 Ed.2
F1
F2
F3
F4
F5
F6
F7

EM TEST EFT 500Nx Series
Manual for Operation V 5.23 14 / 36
3.7.
Setup
SETUP
F1 : Change language
F2 : LCD backlighting
F3 : Interfaces
F4 : Keyboard-Beeper
F5 : Timer
F6 : Safety circuit
F1
F2
F3
F4
F5
F6
F7
Change language
The user can chose between two languages, German and English.
LCD backlighting
With the use of F2 the backlighting can be switched ON or OFF. Additionally the Auto Off function can be
programmed to switch off the backlighting after a specified time the generator has not been in operation (1 -
30min).
Interfaces
This menu will help the user to define the status of the integrated serial and parallel interfaces, e.g. the baud rate
of the RS 232 or the address of the IEEE interface.
Keyboard-Beeper
F1 is the selector for the beeper ON/OFF mode.
The beeper is always on when a test routine is finished. To indicate that a running test is finished the beeper
sounds 3 times.
Timer
Pressing of F5 will show the total operating time of the test equipment.
Safety circuit
The menu F6 is the setting if security circuit is built in or not. Old EFT generators models have no built in safety
circuit. This must be settled in the device setup. The display on the bottom line shows the state after pressing the
function key F1.
Software ISMIEC cannot work proper if the safety circuit setting is not
correct.
For generators with a built in safety circuit connector
the setting must be as shown in the figure below!
SETUP
Display for Burst generators with Safety circuit
F1 : Safety circuit on/off
must have the display shown on the left figure
on / off
off
F1
F2
F3
F4
F5
F6
F7

EM TEST EFT 500Nx Series
Manual for Operation V 5.23 15 / 36
4.
Test Equipment EFT 500N
4.1.
Specification of the test parameters
As per IEC 61000-4-4 the EFT pulses are specified as follows:
Definition of a single pulses
Definition of a complete burst
Parameter
on a 50 load
on a 1000 load
VS
125V –2000V
250V - 4000V
Ri
50
50
td
50ns 30%
35ns –150ns
tr
5ns 30%
5ns 30%
f1
5kHz/2.5kHz
5kHz/2.5kHz
t4
15ms
15ms
t5
300ms
300ms
4.2.
Burst generation
Discharge switch:
The discharge switch is a highly reproducible semiconductor switch. Spike frequencies up to 1000 kHz are by a
factor of 200 higher than recommended in the actual EFT standards. This means of course that also the pulse
energy would be 200 times higher. This is not generally possible for the high voltage switch. Therefore the
following limitation protects the pulse forming circuit against overload:
M5 Version
Voltage U
Max. pulse / burst
td * f
Max. pulse / s
td * f / tr
< 1'500V
1,000
10,000
>= 1'500V < 2'500V
1,000
linear decrease to 5,000
>= 2'500V
linear decrease to 500
linear decrease to 1,500
N8 version:
Voltage U
Max. pulse / burst
td * f
Max. pulse / s
td * f / tr
< 4'000V
150
1,000
>= 4'000V
<= 7'000V
150 –75
linear decrease to 75
1,000 –250
linear decrease to 250

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4.3.
Coupling decoupling network
The decoupling part of the coupling network has to:
- filter the interference pulses in the direction to the power supply;
- protect other systems that are connected to the same power supply and
- realize a high impedance of the power supply, e.g. battery supply.
4.3.1.
Coupling/decoupling network for ac/dc power lines
The coupling network has to couple the interference pulses to the lines of a power supply system (AC or DC). As
coupling devices capacitors of sufficient strength and bandwidth shall be used according to IEC 61000-4-4.
The coupling on signal lines can usually not be effected capacitive without interfering with the signal flow. It is
often impossible to contact the required circuit (direct), e. g. coaxial or shielded cables. In this case the coupling
is realized with the capacitive coupling clamp. The interference simulator can be connected on both sides of the
coupling clamp.
Coupling method:
Test duration: At least 2 minutes in positive and negative polarity. The test duration must be at least as long for
examine all functions of the EUT
Coupling IEC 61000-4-4 edition 2 (2004) and later versions requires to couple all lines simultaneously in
Common Mode coupling.
This means that a EFT test needs two tests with 60s (positive and negative 60s each).
IEC 61000-4-4 (1995, 2001) requires all line combination to be tested individually.
A 1-phase EUT needs to test all combination L, N, PE, L+N, L+PE, N+PE, L+N+PE each with
two tests with 60s (positive and negative 60s each). Total test time 14 x 60 seconds
4.3.2.
Capacitive coupling clamp
- The coupling clamp is not matched by 50 ohm. If the clamp is matched
there exists an additional magnetic coupling, which may cause
completely different test results.
- The clamp should be placed in a distance of 0.5m to the equipment
under test. When the distance is shorter distances, the EUT may be
influenced by radiation.
- If the EUT is includes two separate equipment, the test should be
conducted on each single equipment with the required distance.

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4.4.
Burst Test Setup
- The test generator and the coupling network should be connected to the reference ground plane (acc. to high
frequency requirements).
- The equipment under test must be isolated from the reference ground plane. The distance should be 10cm.
being part of the EUT, these requirements are also recommended for all connected cables. The EUT should
only be grounded if this is recommended by the installation guideline. For safety reasons, the test without any
ground connection should be conducted as well (at 100MHz 1m ground cable has an impedance of about 600
ohm)
- Whenever possible the test set-up and the cabling should always be the same; e.g. for testing power lines it
would be possible to fix the cables on the test table for all tests in the same way.
- Lines under test and all other lines should be decoupled strictly.
4.4.1.
Test setup with capacitive coupling clamp
When using the coupling clamp, the minimum distance between the coupling plates and all other conductive
surfaces (including the generator), except the ground reference plane beneath the coupling clamp and beneath
the EUT, shall be at least 0,5 m.
The distance between any coupling devices
and the EUT shall be (0,5 − 0/+0,1) m for
tabletop equipment testing, and (1,0 ± 0,1) m
for floor standing equipment, unless otherwise
specified in product standards. When it is not
physically possible to apply the distances
mentioned above, other distances can be used
and shall be recorded in the test report.

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4.5.
Computer setup for EFT/Burst testing.
During immunity tests high frequency interference is generated. Due to the length of the connected lines, a
certain part of this energy will be transformed into radiated interference.
Therefore the operator shall be aware that systems and installations in the neighborhood, even those not being
part of the test set-up can be disturbed.
Especially for fully automated test systems, where simple computers may be used, EMC problems within the test
system may occur. To avoid such disturbances in the following paragraphs some information is given to which
the operator has to take care:
- EM TEST generators are tested with the maximum test level. If no damage has been occurred the equipment
must be seen as immune.
- The interference always will enter into a system at the weakest part. Within a computer controlled system the
weakest unit is almost the computer with its interconnection lines and the peripheral equipment.
- The most critical test concerning the above mentioned problems is the burst test according to IEC 61000-4-4
and IEC 61000-4-6 ( conducted RF up to 80MHz). This is a high frequency test, which may radiate extreme
interference fields to the environment.
Concerning the test set-up the following points are explained:
1. The burst generator must be connected very well to the ground reference plane on the table.
2. The ground reference plane shall be connected to the protective earth system. For tests within a shielded
room the connection shall be made to the walls of the room.
3. The test set-up shall have one single ground reference point (not several)
GROUND LOOPS SHALL BE STRICTLY AVOIDED
4. The central ground reference point shall be located where the EFT generator is connected to the ground
reference plane. At the same point the reference ground plane shall be connected to the protective earth
system or to the shielded room.

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For conducting the test the following points shall be taken under consideration:
1. It is not allowed to touch the EUT or the cables under test during a running test. The test results will be
influenced and are no more reproducible.
2. If the operator in contrary touches directly the EUT or the connected lines increased radiation from the test
set-up is generated. The operator itself will radiate and/or will cause ground currents into the whole
environment.
3. As larger the dimensions of an EUT are, as higher the radiation of high frequency energy will be.
4. Especially the capacitive coupling clamp with its length of 1m radiates.
5. Auxiliary equipment as well as computer can be influenced directly due to the radiation.
Remarks:
Even the use of fiber-optic links for the communication between a computer and EFT does not help in case of
direct radiation. The computer and its lines will be directly influenced and the data transmission will be disturbed.
6. The influence of direct radiation can be reduced by increasing the distance between a computer and the test
set-up. In any case a minimum distance of 3m shall be available.
It is not only the length of the cable but also the physical distance between computer and test set-up which is
important to take care to.
7. It is shall be strictly avoided to put the computer directly onto the ground reference plane of the test set-up.
The computer then is part of the test set-up and will also be tested. Mostly all computers are not immune to
this test and will be disturbed.
What to say about the computer:
1. Do not use oldest equipment available in your company. Actual computer show better behavior to what EMC
concerns.
2. Do not use notebooks for this application. Laptops are fully manufactured within a plastic housing and therefore
are very sensitive to all kind of interference.
4. It would be better to use tower- or mini-tower equipment. They are at least partially screened. The interface
connectors are mounted on metallic surfaces so that the screen of the communication lines can be connected
to the chassis.
5. The screens of the USB and IEEE cables must be connected to the chassis of the instruments at both sides,
at the computer and at the EFT generator.
6. The communication cables, USB and IEEE, shall be screened. Do not use standard cables, consumer products
with plastic connectors.
These cable types are using mostly very bad designed cable screens. The contact to the housing of the
connector is mostly realized with a small cable, which is very bad under the aspect of RF screening.
Please take care that the screen is connected very good to the metallic housing of the connector and that the
connector is screwed to the housing of the generator.
This mostly is the problem when using the USB interface. Especially those cables are badly designed. For IEEE
cables very good products are available.
7. The weakest parts within the computer system are the peripherals, as keyboard and mouse. Both products
are not designed to operate under these severe conditions.
It is very easy to make the design better. The operator would be able to do it for himself.
What is the problem?
The screen of the cables between a computer and the keyboard (mouse) are soldered directly to the printed
circuit board.
The screen shall not be soldered to the print, but to another „ground reference plane“.
E.g. put into the keyboard, directly under the keyboard print a broad copper foil area. Connect the screen of the
cable to this copper foil, without any connection to the print. You will see a dramatic change to better results.

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5.
Technical data
5.1.
EFT Electrical Fast Transients Burst as per IEC 61000-4-4
Test Level
N5 / N5.x N8 / N8.x
Open circuit
200V - 4800V ± 10% Step 20V 1000V - 7000V ± 10% Step 50V
Wave shape into a 50load
100V - 2400V 500V –3500V
Rise time tr
5ns ± 30%
Pulse duration td
50ns 30%
Wave shape into a 1000load
200V - 4800V 1000V –7000V
Rise time tr
5ns ± 30%
Pulse duration td
35ns - 150ns
Source impedance
Zq = 50± 20%
Polarity
positive / negative
Trigger
Trigger of bursts
AUTO, MANUAL, EXTERN
Synchronization
0 - 360° (16 - 500Hz)
Asynchron = 0° If a reference signal is connected to the Sync input.
Synchronization
0° - 360°
Burst duration td
0.1ms - 999.9ms, step 0.01 ms
Burst repetition rate tr
10ms - 9999ms
Spike frequency f
0.1kHz - 1000kHz
Test duration T
0:01 min - 99:59 min
Output
EFT 500 N5 /N5.4 /N5.5 / N5.6 EFT 500 N5.2 /N5.7 /N5.8
N8 /N8.2 N8.1
Direct via 50coaxial connector
To connect ext. coupling devices
Coupling network
To L, N, PE all combinations
EUT power mains AC 50/60Hz
250 V / 16 A N5/ N8 3 x 440V/16A EFT N5.7
250 V / 32 A N5.5/ N5.6/ N8.2 3 x 440V/32A EFT N5.1/N8.1
690 V / 32 A N5.4 3 x 440V/50A EFT N5.2
3 x 690V/32A EFT N5.8
EUT DC power
270V / same as AC 270V / same as AC per line
Max Output voltage to 3-phase coupling may be reduced
EUT power supply fuse
The EUT power supply fuse must be installed external. The fuse dimension
must match the rated current of the devices EUT current
Test routines
Quick Start
Immediate start, all parameters adjustable during a running test
Standard test as per
IEC 61000-4-4 : N5 level 1 ... level 5 N8: level 1 ... level 4
Level X - Level Y
User test routines
Customized test routines
Voltage change after T by V
Frequency change after T by f
Frequencysweep in one single burst
Change duration after T by td
Change polarity after T
Statistical burst release
Synchronized at fixed angle
Safety
Safety circuit
Control input ( short circuit )
Design
as per IEC 1010, EN 61010
Interfaces
USB
USB (compatible to USB 1.1 and 2.0); optical for N8 models
IEEE
parallel, addresses 1-30
CN port
Control of CNE 503 for 3-ph testing
Opto Link
Optical interface