Ametek CDN 118A Series User manual

.
Operating-
manual
CDN 118A Series
CDN 118A-C4-4-1
CDN 118A-C6-4-1
Coupling network for surge and
telecom-surge to signal and datalines
The coupling network of the CDN 118A series are designed for
coupling surge and telecom-surge pulses to symmetrical signal
or datalines.
The coupling network expands the range of application of the
impulse generator of the NSG 3040A and NSG 3060A series,
for testing signal and datalines.
Main characteristics are the advantages for handling and the
easy using with banana plugs.
•EC 61000-4-5 Ed3.0
•EN 61000-4-5
•ITU-T K.44
Version:
1.00 / 30.04.2019
The benchmark for emc
Replaces:
No previous version
Filename:
UserManual-CDN 118A-series-E-V1.00.doc
Printdate:
30.04.19

AMETEK CTS CDN 118A series
Operating manual V 1.00 2 / 26
AMETEK CTS GmbH
Sternenhofstrasse 15
4153 Reinach BL1
Switzerland
Phone: [phone]
Fax: [phone]
URL: http://www.emtest.com
Copyright © 2019 AMETEK CTS GmbH.
All right reserved.
Information in earlier versions. Specifications subject to change

AMETEK CTS CDN 118A series
Operating manual V 1.00 3 / 26
Content
1. General.............................................................................................................................4
1.1. Intended use.......................................................................................................................................4
1.2. Safety label on the device ..................................................................................................................4
2. Safety................................................................................................................................5
2.1. Safety aspects....................................................................................................................................5
2.2. Testing and danger.............................................................................................................................6
2.2.1. Coupling networks..............................................................................................................................6
2.2.2. Danger from EUT ...............................................................................................................................6
3. Standards for testing with coupling networks of CDN 118A series............................7
3.1. Device models....................................................................................................................................8
3.2. Impulse generators.............................................................................................................................8
4. Device functions and operating.....................................................................................9
4.1. Coupling network CDN 118A-C4-4-1 and CDN 118A-C6-4-1............................................................9
4.2. Device components CDN 118A-C4-4-1 and CDN 118A-C6-4-1........................................................9
4.3. Test Setup for I/O and datalines.......................................................................................................10
4.4. Test setup for 1.2 µs / 50 µs impulses .............................................................................................11
4.5. Test setup for 10µs / 700µs impulses...............................................................................................12
4.6. Diagram CDN 118A series...............................................................................................................13
5. Technical data ...............................................................................................................14
5.1. CDN 118A series..............................................................................................................................14
5.2. Weight and dimension......................................................................................................................15
6. Maintenance...................................................................................................................16
6.1. General.............................................................................................................................................16
6.2. Calibration and Verification...............................................................................................................16
6.2.1. Factory calibration ............................................................................................................................16
6.2.2. Guideline to determine the calibration period of AMETEK CTS instrumentation.............................16
6.2.3. Calibration of Accessories made by passive components only .......................................................16
6.2.4. Periodically In-house verification......................................................................................................16
6.3. Maintenance, Adjustments, Replacement of Parts ..........................................................................17
7. Calibration procedure as per IEC 61000-4-5 Ed3........................................................18
7.1. Calibration Surge impulse (1.2/50 μs –8/20 μs)..............................................................................18
7.1.1. General ............................................................................................................................................18
7.1.2. Calibration procedure for CDNs for symmetrical interconnection lines ..................................18
7.1.3. Surge waveform definition on CDN for symmetrical interconnection lines.............................19
7.2. Calibration Telecom Surge impulse (10/700 μs –5/320 μs)............................................................20
7.2.1. General ............................................................................................................................................20
7.2.2. Calibration procedure for CDNs for symmetrical interconnection lines..................................20
7.2.3. Telecom Surge waveform definition.............................................................................................21
8. Delivery Groups.............................................................................................................22
8.1. Delivery groups CDN 118A-Cx-4-1 ..................................................................................................22
8.2. Accessories ......................................................................................................................................22
9. Appendix........................................................................................................................23
9.1. Declaration of conformity..................................................................................................................23
9.2. Typical waves...................................................................................................................................25
9.2.1. Voltage waveform...........................................................................................................................25
9.2.2. Current waveform...........................................................................................................................25
9.2.3. Residual voltage waveform ...........................................................................................................26
9.3. Transferfunction................................................................................................................................26

AMETEK CTS CDN 118A series
Operating manual V 1.00 4 / 26
1.
General
1.1.
Intended use
Coupling decoupling networks of the CDN 118A series are used for simulating conducted electromagnetic inter-
ference effects for immunity testing to international, national, and manufacturers’standards.
The CDN’s are designed for full compliance conducted electromagnetic compatibility (EMC) test requirements.
The application range is for testing of industrial, light industrial, household or commercial equipment, including
many product family and product standards as per following basic standards
Only qualified personnel who deal with attendant hazards in impulse generators, are allowed to perform installa-
tion and servicing. Before put in service the attached safety and user manual must be readed and applied. The
Safety and user manual are an essential part of the equipment and must be available to the operator at all times.
The user must obey all safety instructions and warnings.
It is the user’s responsibility to ensure that the test rig does not emit excessive electromagnetic interference (EMI)
that might affect other equipment. The test system itself does not produce any excessive radiation; however, the
injection of interference pulses into the EUT can result in the device and/or its associated cables radiating EMI.
To avoid radiating unwanted interference the standards organizations recommend that the test setup be located
in a Faraday cage.
1.2.
Safety label on the device
Please take note of the following explanations of the symbols used in order to achieve the optimum benefit from
this manual and to ensure safety during operation of the equipment.
This symbol warns of a potential risk of shock hazard. The symbol on an instrument
shows that it can source 1000 volt or more, including the combined effect of normal
and common mode voltages. Use standard safety precautions to avoid personal con-
tact with these voltages.
This symbol indicates where a caution is required. Refer to the operating instructions
located in the manual to protect against personal injury or damage the equipment
CAUTION
The CAUTION symbol indicates a potential hazard. It calls attention to a procedure,
practice or condition which, if not followed, could possibly cause damage to equipment.
Such damage may invalidate the warranty. If a CAUTION is indicated, do not proceed
until its conditions are fully understood and met.
WARNING
The WARNING symbol indicates a potential hazard. It calls attention to a procedure,
practice or condition which, if not followed, could possibly cause bodily injured or
death. If a WARNING is indicated, do not proceed until its conditions are fully under-
stood and met.

AMETEK CTS CDN 118A series
Operating manual V 1.00 5 / 26
2.
Safety
2.1.
Safety aspects
Read the following operation manual carefully. Pay special attention to both safety and operation details!!!
Observe all of these precautions to ensure your personal safety and to prevent damage to the test equipment.
The generators correspond to Installation Category II (overvoltage category).
Symbols marked on equipment
WARNING
Risk of electric shock. Dangerous voltages are present.
Use extreme care. Refer to the manual.
GROUND
Indicates protective earth terminal
Power Mains
The equipment is intended to operate with a power mains supply that will not apply more than 250Vrms between
the supply conductors or between either supply conductor and ground. A proper protective ground connection,
through the grounding conductor in the power cord, is essential for safe system operation.
Safety Ground and grounding the generators
The generators are grounded through the power cord. To avoid electrical shock, plug the power cord into a
properly wired receptacle where earth ground has been verified by a qualified service person. Do this before
making connections to the input or output terminals of the test equipment.
Without the protective ground connection, all parts of generators are potential shock hazards. This includes
knobs and controls that may appear to be insulators. The equipment MUST NOT BE USED if this protection is
impaired.
Use the proper power cord
Use only the power cord and connector specified for your product. Only use a power cord that is in good condi-
tion.
Use the proper fuse
To avoid fire hazard, use only the fuse specified in the parts list for your product, with matching type, voltage
rating, and current rating.
Do not remove covers or panels
To avoid personal injury, do not operate the generators without the panels in place or covers.
Do not operate in explosive atmospheres
The generators provide no explosion protection from electrostatic discharges or arcing components. Do not oper-
ate them in an atmosphere of explosive gases around explosive chemicals.
Electric Overload
Never apply a generator's voltage to a connector which is not specified for that voltage range.

Read the Operation Manual of each instrument carefully!

AMETEK CTS CDN 118A series
Operating manual V 1.00 6 / 26
2.2.
Testing and danger
All tests offered by the High Voltage or EMC generators are immunity tests on electronic equipment or devices.
These tests are potentially dangerous for the operator. Therefore, it is the responsibility of the user to avoid criti-
cal failures and risks to the environment and operator.
Long and distributed lines of the DUT can radiate certain energy to their vicinity. Therefore, it is also the respon-
sibility of the user to decide whether it can conduct immunity tests in a given installation.
Test voltages above 500V may generate spark discharges. Therefore, it is forbidden to test in an explosive envi-
ronment.
National and international recommendations regarding human safety must be followed.
People with certain health conditions, e.g. with a heart pace-maker or similar device, must be excluded from test-
ing.
When setting up the test national and international regulations regarding human safety must be guaranteed.
Generator and coupling/decoupling network must be grounded and connected to reference plane.
2.2.1.
Coupling networks
•The coupling network has mostly no On- Off switch and no internal fuse for the EUT power supply. This is
caused the different regulation in each country. The device under test must be protected by the user in an
adequate safe solution. As an option special adapters and switches can be built-in, but the user must to
specify these special solutions.
•Generators and coupling devices must be grounded and connected to the reference ground.
•For coupling pulses to the lines, the coupling path must be setted.
•If a line has not to be coupled, it is necessary to disconnect or switch off this coupling path.
•Special safety adapter cables are part of the delivery.
2.2.2.
Danger from EUT
The device being tested may become defective and
ignite due to the influence of the applied test signal.
Therefore, the operator shall take the following precautions:
•As soon as the EUT ceases to operate as intended, the test shall be stopped immediately.
•In case of internal damage, the operator may be exposed to high frequency signals of high power (up to 75
Watts and more) anywhere on the EUT.
•Cables and connectors can be overloaded by high voltages or energies.
•Due to internal damage of components fire and/or explosion may occur.
•Unintended use of the EUT may cause hazardous situations near the test area.
Never touch the EUT or anything connected to the EUT during a test.
It is suggested to read the operating manual carefully and completely. It is necessary to observe and
comply with all safety recommendations.

AMETEK CTS CDN 118A series
Operating manual V 1.00 7 / 26
3.
Standards for testing with coupling networks of CDN 118A series
The coupling network CDN118A series are suitable for tests according the following standards:
- IEC 61000-4-5
- EN 61000-4-5
- Surge 1.2/50s as per figure 10 for unshielded symmetrical interconnection lines
- IEC 61000-4-5
- EN 61000-4-5
- Telecom surge 10/700s, Figure A4 for unshielded outdoor symmetrical communica-
tion lines
- ITU-T K.44
Impulse 1.2 s / 50 s
Impulse 10 s / 700 s
IEC 61000-4-5 Ed.3 Figure 10
IEC 61000-4-5 Ed.3 Figure A4
Example for n= 4:
Rc = n x 40 Ω = 160 Ω
Example for n= 2:
Rc = 25 Ω

AMETEK CTS CDN 118A series
Operating manual V 1.00 8 / 26
3.1.
Device models
Following coupling decoupling network for signal and data lines exist:
Standard devices:
Model
Signal lines
EUT max.
Test level max.
Coupling
gas arrestor or other
1.2/50µs 10/700µs
CDN 118A-C4-4-1
4 wires
50 VDC 1A
4,8 kV 1.2/50us
4 x 160 Ω4 x 25 Ω
CDN 118A-C6-4-1
4 wires
50 VDC 1A
6,6 kV 1.2/50us
4 x 160 Ω4 x 25 Ω
3.2.
Impulse generators
The CDN 118A series can be used for the following surge generators:
Device
previous name
Pulseform
Remark generator
NSG 3040A
All models
1.2/50s - 8/20s
up to 4800V as per IEC 61000-4-5
NSG 3060A
All models
1.2/50s - 8/20s
up to 6600V as per IEC 61000-4-5
NSG 3040
All models
1.2/50s - 8/20s
up to 4800V as per IEC 61000-4-5
NSG 3060
All models
1.2/50s - 8/20s
up to 6600V as per IEC 61000-4-5

AMETEK CTS CDN 118A series
Operating manual V 1.00 9 / 26
4.
Device functions and operating
The difference between the various models is:
- Number of data lines (CDN 118A Cx-4-1 series with 4 lines)
- nominal voltage and current level of the signal- and data lines
- various test voltage level of 4.8 kV and 6.6 kV
4.1.
Coupling network CDN 118A-C4-4-1 and CDN 118A-C6-4-1
CDN 118A-Cx-4-1 for 4 lines
4.2.
Device components CDN 118A-Cx-4-1
Front
1 Bypass for get 25 Ωimpedance
2 Coupling GDT / ABD enable
3 Signal output to EUT
4 GND for Calibration measuring device
5 HV / COM input (Generator)
6 Signal input (AE port)
7 Protective devices
8 PE connector to ground

AMETEK CTS CDN 118A series
Operating manual V 1.00 10 / 26
4.3.
Test Setup for I/O and datalines
Arrangement:
The CDN 118A series is placed on the top or on the side
of the surge generator.
Connections frontside
Couplings: All couplings for surge pulses are realized
with short circuit connectors.
Data lines: L1...L4 Output to EUT
Front NSG 3040A with CDN 118A-Cx-4-1
Connections rear side:
1Earth: Earth bolt generator - CDN 118A-Cx-4-1
and additional layer to the system GND
A low inductice copper band or the delivered
cable from the earth set (green-yellow cable).
2Twisted high voltage cable from generator to CDN
HV-cable red: HV generator - HV CDN 118A
HV-cable black: COM generator - COM CDN 118A
HV-COM plug on CDN 118A device
3HV and COM generator output CDN 118A-Cx-4-1
4AE Port protection
5AE Port Input, Transducer - Sensor
Rear NSG 3040A with CDN 118A-Cx-4-1
Example of a test setup with an NSG 3040A or NSG 3060A generator and CDN 118A-Cx-4-1 coupling / decoupling
network. It is important to connect GND wire from CDN 118A-Cx-4-1 to the impulse generator. The HV impulse
cables between the generator and CDN 118A-Cx-4-1 must be twisted for mimimize the magnetic field influence.
The device earth bolt must be connected to the ground reference plane if there is one. In other case
user is responsible that the generator earth bolt is proper connected with the building earth.
Earth set
The earth set is part of the delivery and includes a
length of 0.6m

AMETEK CTS CDN 118A series
Operating manual V 1.00 11 / 26
4.4.
Test setup for 1.2 µs / 50 µs impulses
The energy transfer from the surge generator to the EUT is considered
to be a constant which independs from the number of lines in the cable,
equivalent to a coupling impedance of about 40 Ω. This equivalent cou-
pling impedance is split between the lines in the cable. For this reason,
the coupling resistor value used on each line in a pair is a multiple of 40
Ω. This rule applies for cables with up to 8-line (4-pair). The CDN shall
be selected to match the number of lines/pairs existing in the cable.
Rc for 4 lines: 4 x 40 Ω = 160 Ω (25 Ω +135 Ω)
4.4.1.
Test setup with 4 lines Network CDN 118A-Cx-4-1
4 Data line setup:
Each of the 4 lines has an impedance of= 160 Ω
All four lines are connected by using a coupling device
(CD, see chapter 8.2. Accessories)
2 Data line setup:
Two lines are switched in parallel. Each of the 2 lines has
an impedance of= 80Ω(160 Ω// 160 Ω)
L1 = (L1’// L3’)
L2 = (L2’// L4’)
- Line 1 and Line 2 coupled with a coupling device (CD) to the EUT output.
- Lines L1 is parallel with L3
- Lines L2 is parallel with L4

AMETEK CTS CDN 118A series
Operating manual V 1.00 12 / 26
4.5.
Test setup for 10µs / 700µs impulses
Due to the nature of the wiring used for unshielded outdoor symmetrical
communication lines (twisted pairs), the coupling is always in common
mode. The coupling decoupling schematic is shown in Figure A.4. (IEC
61000-4-5 Ed 3.0)
Coupling via arrestors (GDT) or Avalanche breaking diodes (ABD) is the
preferred coupling method for unshielded outdoor symmetrical commu-
nication lines. The coupling network also has the task of splitting the
surge current into multiple pairs in multi-conductor cables. The internal
generator matching resistor Rm2 (25 Ω) is replaced by the Rc = 25 Ωin
the CDN 118A coupling / decoupling network.
The suggested coupling and decoupling network design and component
values may not be suitable for high speed networks as the wanted data
transmission may be degraded.
Figure A4 IEC 61000-4-5 Ed3.0
4.5.1.
Test setup with 4 lines Network CDN 118A-Cx-4-1
4 Dataline setup: Two symmetrical lines (2 pairs)
Each of the 4 lines has an impedance of= 25 Ω
Bridge (grey): The 25 Ωimpedance results by shorting
the 135 Ωresistors.
Bridge (CD): Connection for the built-in coupling
device (GDT/ABD) for coupling to lines
L1 to L4.
2 Data line setup: One symmetrical lines (1 pair)
Bridge (grey): The 25 Ωimpedance results by shorting
the 135 Ωresistors of lienes L1 and L2.
Bridge (CD): Connection for the built-in (GDT/ABD) for
coupling to lines L1 and L2.

AMETEK CTS CDN 118A series
Operating manual V 1.00 13 / 26
4.5.2.
Diagram CDN 118A-series
Diagram CDN 118A-Cx-4-1

AMETEK CTS CDN 118A series
Operating manual V 1.00 14 / 26
5.
Technical data
5.1.
CDN 118A series
CDN 118A-C4-4-1
CDN 118A-C6-4-1
Testlevel
Max. test voltage
4800V 1,2/50s or 10/700s
6600V 1,2/50s or 10/700s
Number of lines
4
4
Decoupling
L = 20mH
L = 20mH
Residual voltage (decoupled side)
1.2 µs / 50 µs
85 V
10 µs / 700 µs
80 V
EUT signal
EUT line voltage
50 V or 250 V depends on DPM model
EUT current
1 A
Signal Bandwith
Coil up to 100 kHz with 600 Ωload
Coupling 1.2 µs / 50 µs
yes
Serial resistor
4 x 160 Ω (25 Ω + 135 Ω)
4 x 160 Ω (25 Ω + 135 Ω)
Coupling elements
Gas arrestor or other coupling device with external box
Coupling 10 µs / 700 µs
yes
Serial resistor
4 x 25 Ω
Coupling elements
Gas arrestor or other coupling device with external box
Coupling ITU K20
yes
Serial resistor
4 x 25 Ω
Output
Datalines 4 lines
Bananaplugs 4 Lines L1, L2, L3, L4
General
Temperature
5 - 40 C operating
Humidity
10%...90% no condensing
Dimension (B x D x H)
448 mm x 400 mm x 154 mm

AMETEK CTS CDN 118A series
Operating manual V 1.00 15 / 26
5.2.
Weight and dimension
Model
Signal lines
Weight [kg]
Dimension
L x W x H [mm]
Housing
CDN 118A-C4-4-1
4 wires
11.2 kg
448 x 500 x 154
A
CDN 118A-C6-4-1
4 wires
11.2 kg
448 x 500 x 154
A
Housing A
=> Non relevant data for the standards can be changed by the manufacturer <=

AMETEK CTS CDN 118A series
Operating manual V 1.00 16 / 26
6.
Maintenance
6.1.
General
The coupling network is built with passive components only. The coupling network of the CDN 118A series is
absolutely maintenance free.
6.2.
Calibration and Verification
6.2.1.
Factory calibration
Every AMETEK CTS generator is entirely checked and calibrated as per international standard regulations before
delivery. A calibration certificate is issued and delivered along with a list of the equipment used for the calibration
proving the traceability of the measuring equipment. All auxiliary equipment and accessories are checked to our
internal manufacturer guidelines.
The calibration certificate and the certificate of compliance (if available) show the date of calibration.
The AMETEK CTS equipment is calibrated in the factory and marked with a calibra-
tion mark. The used measuring instruments are traceable to the Swiss Federal Office
of Metrology.
The calibration date is marked. The validity of the calibration is to the responsibility
of the user’s quality system. Neither the certificate of calibration nor the correspond-
ing label mark any due date for re-calibration.
Examples: Calibration mark
6.2.2.
Guideline to determine the calibration period of AMETEK CTS instrumentation
Our International Service Departments and our QA Manager are frequently asked about the calibration interval of
AMETEK CTS equipment.
AMETEK CTS doesn’t know each customer’s Quality Assurance Policy, nor do we know how often the equip-
ment is used and what kind of tests is performed during the life cycle of test equipment. Only the customer knows
all the details and therefore the customer needs to specify the calibration interval for his test equipment.
In reply to all these questions we like to approach this issue as follows:
AMETEK CTS make use of a solid-state semiconductor switch technique to generate high voltage transients. A
precious advantage of this technique is the absolute lack of periodical maintenance effort. In consequence,
thereof a useful calibration period must be defined based on two criteria:
- The first one is the customer’s Quality Assurance Policy. Any existent internal regulation must be applied at
highest priority. In the absence of such internal regulation the utilization rate of the test equipment must be
taken into consideration.
- Based on the experience and observation collected over the years AMETEK CTS recommends a calibration
interval of 1 year for frequently used equipment. A 2-years calibration interval is considered sufficient for
rarely used test generators in order to assure proper performance and compliance to the standard specifica-
tions.
6.2.3.
Calibration of Accessories made by passive components only
Passive components do not change their technical specification during storage. Consequently, the measured
values and the plots stay valid throughout the storage time. The date of shipment shall be considered as the date
of calibration.
6.2.4.
Periodically In-house verification
Please refer to the corresponding standard before carrying out a calibration or verification. The standard de-
scribes the procedure, the tolerances and the necessary auxiliary means. Suitable calibration adapters are
needed. To compare the verification results, AMETEK CTS suggests for refer to the waveshape and values of
the original calibration certificate.
All calibrations and verifications are always done without mains supply voltage connected to the coupling network
input.
Danger
Before starting the calibration or verification
remove the EUT Mains Supply
from the generator and from the coupling network

AMETEK CTS CDN 118A series
Operating manual V 1.00 17 / 26
6.3.
Maintenance, Adjustments, Replacement of Parts
ATTENTION
Electrical maintenance must only be performed by
qualified service technicians...
The generators do not contain any parts or components requiring special maintenance.
Electrical maintenance must only be performed by experienced and specially trained technicians. Generally,
standard maintenance requires only the periodic cleaning of the instrument, verification and calibration of certain
parameters.
•When removing the cover or other parts of the equipment, high voltage parts may become exposed. High
voltages are potentially lethal.
•For service, repair, adjustment or replacement of parts, the generator must be disconnected from all power
supply sources before covers are to be removed.
•The user is not permitted to change or modify any EM TEST generator. Only original EM TEST parts and
components shall be used for repair and service. EM TEST is not responsible for accidents or injuries caused
through the use of parts or components not sold by EM TEST...
•Maintenance and service must only be performed by qualified service technicians who are trained and famil-
iar with the dangers of servicing the EM TEST generator.
•Only fuses of correct voltage and amperage as specified by the manufacturer are to be used for replacement.
The repair of fuses is not permitted.

AMETEK CTS CDN 118A series
Operating manual V 1.00 18 / 26
7.
Calibration procedure as per IEC 61000-4-5 Ed3
7.1.
Calibration Surge impulse (1.2/50 μs –8/20 μs)
7.1.1.
General
Calibration measurements shall be performed as indicated in Table 9 of IEC 61000-4-5 Ed3.0 at the CDN rated
impulse voltage. The peak amplitude, the front time and duration shall be measured at the EUT output port.
7.1.2.
Calibration procedure for CDNs for symmetrical interconnection lines
The inputs of the DN at the auxiliary equipment (AE) shall be short-circuited to PE for the voltage and current
measurements at the EUT output port.
The residual voltage value depends on the protection requirements of the AE. Therefore, no limits are given in
this standard.
It is recommended that the open-circuit voltage between wires of different pairs is also measured. A differential
voltage between pairs can produce false failures in EUTs that are designed to operate in highly balanced net-
works. No limit has been proposed for this value as the tolerance is dependent upon the design of the EUT.
Coupling
Measuring
AE side
EUT side
Surge voltage
at EUT side
Common mode –
all lines to PE
40 Ωpath*
All lines shorted
together
Peak voltage,
front time, duration
All lines shorted
to PE
Open–circuit all
lines connected
together
Surge current
at EUT side
Common mode –
all lines to PE
40 Ωpath*
Single line
Peak current,
front time, duration
All lines shorted
to PE
All lines shorted to
PE
Residual voltage
on AE side (with pro-
tection elements)
Common mode –
all lines to PE
40 Ωpath*
Line to PE at a time
peak voltage
Open–circuit
Open–circuit
* A 40 Ωpath means that the transfer impedance is always 40 Ω. This means that for coupling to 1 pair 80 Ω
per line or 40 Ωper pair are used, for coupling to 2 pairs 160 Ωper line or 80 Ωper pair are used, for cou-
pling to 4 pairs 320 Ωper line or 160 Ωper pair are used.
Table 9 IEC 61000-4-5 Ed3.0 Summary of calibration process for CDNs for symmetrical interconnection lines

AMETEK CTS CDN 118A series
Operating manual V 1.00 19 / 26
The intention of this calibration process is to check the proper function of the components, the saturation of de-
coupling chokes, the decoupling effect of the decoupling part, the current capability and the coupling effect of the
coupling network part. The coupling method has an influence on the voltage and current wave forms. The pa-
rameters for the calibration are defined in Table 10 of IEC 61000-4-5 Ed3.0
Coupling
method
CWG
Output
voltage
a,b,c
Voc at CDN
EUT output
± 10 %
Voltage
front time Tf
Tf = 1,67 × Tr
± 30 %
Voltage
duration Td
Td = Tw
± 30 %
Isc at CDN
EUT output
± 20 %
Current
front time Tf
Tf = 1,25 × Tr
± 30 %
Current
duration Td
Td=1,18 ×Tw
± 30 %
Common mo-
de CD d
40 Ωpath
2 kV
2 kV
1,2 μs
45 μs
48 A
1,5 μs
45 μs
a
b
c
d
It is recommended to calibrate the CDN at the highest rated impulse voltage, as this will minimise the
effects of the switching noise generated by CLDs and GDTs. The value shown in the table is for a gen-
erator setting of 2 kV. In case the CDN is rated for another maximum impulse voltage, the calibration
shall be done at this maximum rated impulse voltage. The short-circuit peak current specification shall
be adapted accordingly. For example, if the maximum voltage is 4 kV, the shortcircuit current value shall
be multiplied by 2.
Coupling via gas arrestors, clamping or avalanche devices will show some switching noise on the im-
pulse wave. Working with the highest possible impulse voltage will minimise their impact on measure-
ments, however, it is recommended to neglect the switching noise for the peak values measurements.
The values shown in this table are for a CWG with ideal values. In case the CWG generates parameter
values close to the tolerances, the additional tolerances of the CDN may generate values out of toler-
ances for the CWG-CDN combination.
The coupling device (CD) can be based upon capacitors, gas arrestors, clamping devices, avalanche
devices or any method that allows the wanted data of the EUT to function correctly and at the same time
meet the impulse waveform parameters of this table.
Table 10 –Surge waveform specifications at the EUT port of the CDN for symmetrical interconnection lines
7.1.3.
Surge waveform definition on CDN for symmetrical interconnection lines
Waveform of open circuit voltage (1,2/50 μs)
Waveform of short circuit current (8/20μs)
Front time Tf [μs]
Duration Td [μs]
Open-circuit voltage
Tf = 1,67 × T = 1,2 ± 30 %
Td = Tw = 45 ± 30 %
Short-circuit current
Tf = 1,25 × Tr = 1.5 ± 20 %
Td = 1,18 × Tw = 45 ± 30 %

AMETEK CTS CDN 118A series
Operating manual V 1.00 20 / 26
7.2.
Calibration Telecom Surge impulse (10/700 μs –5/320 μs)
7.2.1.
General
Due to the nature of the wiring used for unshielded outdoor symmetrical communication lines (twisted pairs), the
coupling is always in common mode.
The coupling decoupling schematic is shown in IEC 61000-4-5 Ed.3.0 Figure A.4.
7.2.2.
Calibration procedure for CDNs for symmetrical interconnection lines
Measurements shall be performed with the impulse applied to one coupling path at a time.
The peak amplitude, the front time and impulse duration shall be measured for the CDN at the impulse voltage
under open-circuit conditions and the current under short-circuit conditions according to (Table A.4. of IEC
61000-4-5 Ed3.0).
The inputs of the decoupling network (DN) at the AE side shall be short-circuited to PE for the impulse voltage
and impulse current measurement at the EUT output port.
The residual voltage value depends on the protection requirements of the AE. Therefore, no limits are given in
this standard.
Coupling
Measuring
AE side
EUT side
Surge voltage
at EUT side
Common mode –
one pair to PE
Both lines from one
pair shorted together:
peak voltage, front
time, duration
All used lines
shorted to PE
Open-circuit, both
lines from one
pair connected
together
Surge current
at EUT side
Common mode –
one pair to PE
Both lines from one
pair shorted together:
peak current, front
time, duration
All used lines
shorted to PE
Both lines from
one pair shorted
to PE
Residual voltage
on AE side (with pro-
tection elements)
Common mode –
one pair to PE
Both lines from one
pair shorted together:
peak voltage
Open–circuit
Open–circuit
Table A.3 IEC 61000-4-5 Ed3.0–Summary of calibration process for CDNs for unshielded outdoor symmetrical communication lines