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INSTRUCTION MANUAL
LI-150C LINE IMPEDANCE STABILIZATION NETWORK
INSTRUCTION MANUAL
For
LINE IMPEDANCE STABILIZATION NETWORK
Model LI-150C
150 kHz to 30 MHz
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INSTRUCTION MANUAL
LI-150C LINE IMPEDANCE STABILIZATION NETWORK
Table of Contents
1.0 Introduction .......................................................................................................................... 3
2.0 Products Available from Com-Power................................................................................ 4
3.0 Product Safety Information ................................................................................................. 5
3.1 Product Hazard Symbols Definitions ................................................................................. 5
3.2 Incoming Inspection .......................................................................................................... 6
3.3 Package Inventory .......................................................................................................... 6
3.4 General Safety Instructions ............................................................................................. 6
4.0 Product Specifications ........................................................................................................ 9
5.0 Product Description ............................................................................................................ 10
5.1 Overview ............................................................................................................................ 10
5.2 Product Setup .................................................................................................................... 10
5.3 Front & Rear Panel Marking ............................................................................................. 11
6.0 LISN Theory ......................................................................................................................... 13
7.0 Typical Performance Data ................................................................................................ 14
8.0 Warranty ............................................................................................................................. 16
8.1 Maintenance ..................................................................................................................... 16
List of Figures
Figure 1: Single Phase connection with one set of LISN……………………………………………………………. 10
Figure 2: Three Phase connections with two sets of LISN………………………………………………………….. 11
Figure 3: Rear Panel…………………………………………………………………………………………………... 11
Figure 4: Front Panel………………………………………………………………………………………………….. 11
Figure 5: Example of equivalent LISN circuit……………………………………………………………………….. 13
Figure 6: Typical Impedance compared to ANSI C63.5 & CISPR 16-1-2 requirements…………………………. 14
Figure 7: Typical Phase compared to CISPR 16-1-2 requirements. ……………………………………………….. 14
Figure 8: Typical Isolation compared to CISPR 16-1-2requirements …………………………………………….. 15
Figure 9: Typical Insertion Loss……………………………………………………………………………………… 15
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1.0 INTRODUCTION
This manual includes descriptions of front and rear panel ports, controls and indicators;
product specifications, safety precautions, operational instructions and warranty
information and guidelines and instructions for its proper usage.
Information contained in this manual is the property of Com-Power Corporation. It is issued
with the understanding that the material may not be reproduced or copied without the
express written permission of Com-Power.
INSTRUCTION MANUAL
LI-150C LINE IMPEDANCE STABILIZATION NETWORK
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Antennas
Antenna Kits
Absorbing Clamps
Coupling/Decoupling
Networks (CDN)
Comb Generators
Current Probes
Emissions Test
Systems
Conducted Immunity
Test Systems
Impedance Stabilization
Networks (ISN)
Line Impedance Stabilization
Networks (LISN)
Antenna Masts
Near-Field
Probe Sets
Preamplifiers
Power Amplifiers
Spectrum Analyzers
Product Safety Test
Equipment
Transient Limiters
Turntables
Antenna Tripods
Telecom Test
Systems
LI-150C LINE IMPEDANCE STABILIZATION NETWORK
2.0 PRODUCTS AVAILABLE FROM COM-POWER
INSTRUCTION MANUAL
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www.com-power.com
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LI-150C LINE IMPEDANCE STABILIZATION NETWORK
3.0 PRODUCT SAFETY INFORMATION
3.1 Product Hazard Symbols Definitions
The hazard symbols appearing on the product exterior are defined below.
The yellow triangle with an exclamation mark indicates the
presence of important operating and/or maintenance (servicing)
instructions in the literature accompanying the product.
The yellow triangle with a lightning bolt indicates an alert to the
user that un-insulated dangerous voltages are present within the
product enclosure and on output connectors. These voltages may
be of sufficient magnitude to constitute a risk of electric shock to
persons.
INSTRUCTION MANUAL
The Ground symbol inside a circle indicates terminal which is
intended for connection to an external conductor for protection
against electric shock in case of a fault, or the terminal of a
protective earth (ground) electrode.
To indicate on the rating plate that the equipment is suitable for
AC current.
To indicate on the rating plate that the equipment is suitable for
direct current.
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INSTRUCTION MANUAL
LI-150C LINE IMPEDANCE STABILIZATION NETWORK
3.2 Incoming Inspection
To avoid possibility of electrical shock, do not apply power to the LISN if there is
any evidence of shipping damage. If shipping damage to the product or any of
the accessories is suspected, or if the package contents are not complete,
contact Com-Power or your Com-Power distributor.
Please check the contents of the shipment against the package inventory in
section 3.3 to ensure that you have received all applicable items.
3.3 Package Inventory
Equipment, accessories, and documents supplied with the model LI-150C LISN are
as follows:
Calibration data and Certificate traceable to NIST.
Superior Electric shrouded plugs for EUT and power connection.
Optional items
ISO-17025 calibration data and certificate.
External transient limiter model LIT-153.
3.4 General Safety Instructions
The following safety instructions have been included in compliance with safety
standard regulations. Please read them carefully.
• READ AND RETAIN INSTRUCTIONS - Read all safety and operating
instructions before operating the instrument. Retain all instructions for
future reference.
• HEED WARNINGS - Adhere to all warnings on the instrument and
operating instructions.
• FOLLOW INSTRUCTIONS - Follow all operating and use instructions.
• WATER AND MOISTURE - Do not use the instrument near water.
• VENTILATION - The instrument should be used/installed only in locations
where the flow of air through the ventilation openings is not impeded.
• MOUNTING – The instrument can be used in Horizontal or vertical
orientation as long as the ventilation holes are not obstructed and the
protective grounding is not defeated.
• HEAT - The instrument should be situated away from heat sources such as
heat registers or other instruments which produce heat.
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INSTRUCTION MANUAL
LI-150C LINE IMPEDANCE STABILIZATION NETWORK
• POWER SOURCES - Connect the instrument only to the type of power
source described in the operating instructions or as marked on the
instrument.
•GROUNDING - Take precautions to insure that the grounding of the
instrument is not defeated. Grounding conductor with adequate crosssection must be connected between a grounding conductor
connection for the measurement area and the grounding conductor
connection (grounding bolt) on the back/front panel of the LISN and the
LISN bottom plate, before applying any power to the LISN. At shutdown
or before dismantling the LISN setup, ensure that the power to LISN is
discontinued before the ground conductor connection is disconnected.
CAUTION:
The LI-150C is based on the 50Ω/50 µH artificial mains network (AMN)
circuit and component values (Figure 3) specified in ANSI C 63.4 – 2009
American National Standard for Methods of Measurement of RadioNoise Emissions from Low-Voltage Electrical and Electronic Equipment in
the Range of 9 kHz to 40 GHz
The specified minimum line to ground capacitance (1µF) induces
leakage currents in excess of the value permitted under EN 61010-1
standard – safety requirements for electrical equipment for
measurement, control and laboratory use.
In addition, the basic insulation required for a category I protection
device cannot be assured. Therefore it is imperative to provide
additional measures safeguarding against direct or indirect contact by
user.
The operator is responsible for ensuring that protection is maintained
during work with the line impedance stabilization network (LISN).
Before using the LISN, a secure ground connection must be made to the
LISN’s grounding bolt and/or the bottom metal plate (The bottom surface
of the LISN is left unpainted for effective ground connection). It must not
be removed until after the LISN has been disconnected from the mains
power supply, in order to avoid electric shock.
The safety notes in the accompanying operating instructions and on the
outside of the device must be followed at all times.
• POWER CORD PROTECTION - Place power supply cords so that they are
not likely to be walked on or pinched by items placed on them or
against them.
• CLEANING – Clean the instrument outside surfaces of the device with a
soft, lint-free cloth. If necessary, a mild detergent may be used.
• NON-USE PERIODS - Unplug the power cords of the instrument when it will
be left unused for a long period of time.
• OBJECT AND LIQUID ENTRY - Take care that objects do not fall into the
instruments and that liquids are not spilled into the enclosure through
openings.
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• DEFECTS AND ABNORMAL STRESS - Whenever it is likely that the normal
operation has been impaired, make the equipment inoperable and
secure it against further operation.
• SITTING OR CLIMBING - Do not sit or climb upon the instrument or use it as
a step or ladder.
•ENVIRONMENTAL CONDITIONS - This equipment is designed for indoor use.
Ambient temperature range during operation should be between 5° C to
40° C.
•STORAGE AND PACKAGING - The device should only be stored at a
temperature between –25 and +70 °C. During extended periods of
storage, protect the device from dust accumulation. The original
packaging should be used if the device is transported or shipped again.
If the original packaging is no longer available, the device should be
packed carefully to prevent mechanical damage.
INSTRUCTION MANUAL
LI-150C LINE IMPEDANCE STABILIZATION NETWORK
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Model:
LI-150C
Electrical
Frequency range:
150 kHz to 30 MHz
Compliant standards:
CISPR 16-1-2 Edition 2.0: 2014-03, ANSI
C63.4: 2014
Number of lines:
Two lines
Max current rating:
50 Amp AC, 35 Amp DC
Max Voltage rating:
270 VAC, 50/60 Hz (Line to Ground)/
380 VDC
Inductor type:
50 µH
EUT & Power connector:
Shrouded Superior Electric Banana
Connector
RF measurement connector:
50Ω, N type (female)
Mechanical
Dimensions of Each LISN (L x W x H):
15 x 10 x 10 inches / 38 x 25.4 x 25.4 cm
Weight of each LISN :
14 lb. /6.3 kg
Environmental
Operating Temperature
5° C to 40° C / 40° F to 104° F
4.0 PRODUCT SPECIFICATIONS
INSTRUCTION MANUAL
LI-150C LINE IMPEDANCE STABILIZATION NETWORK
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Figure 1: Single Phase connection with one set of LISN
5.0 PRODUCT DESCRIPTION
5.1 Overview
The LI-150C Line Impedance Stabilization Network is specifically designed to
provide necessary measurement platform for performing power line conducted
emissions (disturbance measurements) compliance testing as required for FCC,
CISPR, CE and other worldwide standards for commercial products. It is fully
compliant with the requirements of both CISPR 16-1-2 and ANSI C63.4.
The LI-150C performs each of the following functions during the measurement:
• provides a defined, stable impedance throughout the measurement
frequency range;
• isolates the EUT and measurement circuit from the power source, thereby
minimizing its influence on the measurements; and,
• couples the disturbance voltages to the coaxial measurement port for
connection to the measuring instrument like EMI Receiver or Spectrum
Analyzer.
INSTRUCTION MANUAL
LI-150C LINE IMPEDANCE STABILIZATION NETWORK
5.2 Product Setup
Before initiating use of LISN, ensure that,
• PE conductor is connected to ground.
• The ventilation openings are unobstructed.
• No signal or operating voltages above the permissible limits given in
specification.
• The LISN’s power input port is connected to an appropriate power source
employing properly rated mains protection, as over current protection is
not provided in the LISN.
Failure to comply with any of these points may damage the equipment and/or
pose an electrical hazard.
5.2.1 Typical connection diagrams
The LISNs can be used with single phase power sources with one set of
LISNs and also three phase power sources (requires two sets of LISNs). Given
below are the typical connection setup’s for each configuration.
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5.3.3
5.3.2
5.3.4
5.3.1
5.3.2
Figure 3: Rear Panel
Figure 4: Front Panel
Figure 2: Three Phase connections with two sets of LISN
INSTRUCTION MANUAL
LI-150C LINE IMPEDANCE STABILIZATION NETWORK
5.3 Front & Rear Panel Marking
5.3.1 Power input port
The Model LI-150C has a Superior Electric Shrouded pin receptacle for
connection to an external DC or AC input power source. The LISN is
shipped with two matching shrouded socket plug, for connection to the
input power source cables.
CAUTION
Due to the high level of earth leakage current, the device cannot be
connected to any power source protected by either a ground fault circuit
interrupter (GFCI) circuit breaker or residual current devices (RCDs).
The power source must be protected by a circuit breaker with a current
rating which is greater than or equal to the rating of the LISN.
5.3.2 Grounding bolt (GND)
The threaded bolt with hex nut marked 'GND' are found on both front and
back panel of the LISN. This bolt is used for Protective grounding
connections. In addition to this, the un-painted bottom surface of the LISN
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should be bonded directly to an earth referenced ground plane for
effective RF reference ground. In cases where no ground plane is
available, a mains isolating transformer shall be used.
Please refer Safety instructions for more information on importance of
grounding. The grounding instructions are to be followed at all times.
5.3.3 EUT power port
The LI-150C has a Superior Electric Shrouded socket receptacle to power
the equipment under test. The LISN is shipped with the matching shrouded
pin plug for making the connections to EUT power cable.
5.3.4 EMI measurement Port
The LI-150C provides a 50 Ω N-Type (female) connector to connecting the
Spectrum analyzer or EMI receiver for making conducted noise
measurements. The shielding connection of the N connector shield is
connected to the housing of the LISN and thus to ground.
Note: CISPR recommends the use of 10 dB attenuator at the output of the
LISN measurement port. Also, as the input circuitry of EMI receivers and
spectrum analyzers are extremely sensitive; it is highly recommended to use
transient limiter in line with the cable connecting the measurement port to
the measuring equipment in order to protect the input circuits from
damage by high voltage transients. Com-Power transient limiters also
incorporate both a low pass and high pass filter to attenuate out of band
signals, as well as a 10 dB attenuation pad. Both, the 10 dB attenuator and
the transient limiter are available with Com-Power.
INSTRUCTION MANUAL
LI-150C LINE IMPEDANCE STABILIZATION NETWORK
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6.0 LISN THEORY
Line Impedance Stabilization Networks provide standardized line impedance to the EUT
during conducted emissions testing which is independent of the external power line
impedance. The standardized impedance enables consistent readings for RF noise
measurements on the power line. The model LI-150C consists of two separate LISN
networks housed in separate enclosures for testing EUTs with single phase power
requirements.
In addition to providing standardized impedance, the LISN also acts as a low pass filter for
the power to equipment under test. The LISN blocks RF noise from the power line from
reaching the equipment under test, however, the power to the equipment passes
through the LISN with minimal attenuation. This filter is comprised of a single stage low
pass LC filter. The inductors (L) used in the LI-150C are air core type to eliminate the
possibility of saturation and to provide stability.
The LISN also provides a low impedance path for the RF noise from the EUT to the
measuring equipment, thereby facilitating the measurement of the EUT RF noise. The
insertion loss factors provided with every LISN network. It may be significant at low
frequencies; especially below 400 kHz. Therefore, the insertion loss correction factors
should always be considered for the highest measurement accuracy.
Example schematic of the LISN as well as the respective impedance requirements are
specified in the ANSI C63.4 and CISPR-16-1-2 standards. CISPR 16-1-2 also specifies
additional requirements for phase performance and Mains port isolation. A typical circuit
diagram of an LISN is given in figure below.
INSTRUCTION MANUAL
LI-150C LINE IMPEDANCE STABILIZATION NETWORK
Figure 5: Example of equivalent LISN circuit
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20
30
40
50
60
70
0.1 1 10 100
Impedance (ohms)
Frequency (MHz)
LISN Impedance
CISPR 16-1-2,
Ed.1.2, Tbl 4
(50uH)
Impedance
Limits (±20%)
ANSI C63.42009, Tbl B.2
(50uH)
Impedance
Limits (±20%)
-20
-10
0
10
20
30
40
50
60
70
0.1 1 10 100
Phase Angle (degrees)
Frequency (MHz)
LISN Phase
CISPR 16-1-2,
Ed.1.2, Tbl 4
(50uH) Phase
Limits (±11.5°)
7.0 TYPICAL PERFORMANCE DATA
INSTRUCTION MANUAL
LI-150C LINE IMPEDANCE STABILIZATION NETWORK
Figure 6: Typical Impedance compared to ANSI C63.5 & CISPR 16-1-2 requirements
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Figure 7: Typical Phase compared to CISPR 16-1-2 requirements.
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20
30
40
50
60
70
80
90
100
0.1 1 10 100
Isolation (dB)
Frequency (MHz)
LISN Isolation
CISPR 16-1-2
Edition 1.2
(Isolation
Limit Minimum)
0
0.2
0.4
0.6
0.8
1
0.1 1 10 100
Insertion Loss (dB)
Frequency (MHz)
LISN
Insertion Loss
INSTRUCTION MANUAL
LI-150C LINE IMPEDANCE STABILIZATION NETWORK
Figure 8: Typical Isolation compared to CISPR 16-1-2 requirements
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Figure 9: Typical Insertion Loss
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8.0 WARRANTY
Com-Power warrants to its Customers that the products it manufactures will be free from
defects in materials and workmanship for a period of three (3) years. This warranty shall
not apply to:
Transport damages during shipment from your plant.
Damages due to poor packaging.
Products operated outside their specifications.
Products Improperly maintained or modified.
Consumable items such as fuses, power cords, cables, etc.
Normal wear
Calibration
Products shipped outside the United States without the prior knowlege of Com-
Power.
In addition, Com-Power shall not be obliged to provide service under this warranty to
repair damage resulting from attempts to install, repair, service or modify the instrument
by personnel other than Com-Power service representatives.
INSTRUCTION MANUAL
LI-150C LINE IMPEDANCE STABILIZATION NETWORK
Under no circumstances does Com-Power recognize or assume liability for any loss,
damage or expense arising, either directly or indirectly, from the use or handling of this
product, or any inability to use this product separately or in combination with any other
equipment.
When requesting warranty services, it is recommended that the original packaging
material be used for shipping. Damage due to improper packaging will void warranty.
If you feel that the product is not working as intended, or is malfunctioning, please
contact Com-Power for assistance. In the case of repair or complaint, Please visit our
website www.com-power.com and fill out RMA form (http://com-
power.com/repairservicereq.asp). Our customer service personnel The RMA
number should be displayed in a prominent location on the packaging and on the
product, along with a description of the problem, and your contact information.
8.1 Maintenance
This product contain no user serviceable parts inside. If the unit does not operate
or needs calibration, please contact Com-Power Corporation. Any modifications
or repairs performed on the unit by someone other than an authorized factory
trained technician will void warranty.
The exterior surface may be cleaned with mild detergent and then be wiped with
a dry, clean, lint-free cloth. Use care to avoid liquids or other foreign objects
entering the chassis.
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