User Guide – Line Impedance Stabilization Network
1
Serial Number
EMCIS Building 77 Deokcheonro, Manan-gu,
Anyang-si, Gyeonggi-Do, Korea 14086
Website www.emcis.co.kr e-mail : [email protected]
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ELECTRO-MAGNETIC COMPATIBILITY INSTRUMENTS & SOLUTION
LISN (LN2-50N)
User’s Operating Manual
Please read this manual before usage
Please keep this manual with the equipment
User Guide – Line Impedance Stabilization Network
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EMCIS will repair this equipment free of charge if a malfunction occurs within 2 years
after shipment due to a manufacturing fault, provided that warranty is rendered void
under any or all of the following conditions.
The fault is outside the scope of the warranty conditions described in the
operation manual.
The fault is due to disoperation, misuse, or unauthorized modification or repair
of the equipment by the customer.
The fault is due to severe usage clearly exceeding normal usage
The fault is due to improper or insufficient maintenance by the customer.
The fault is due to natural disaster including fire, flooding, and earthquake, etc.
The fault is due to use of non specified peripheral equipment, peripheral parts,
consumables, etc.
The fault is due to use of non specified power supply or in non-specified
installation location.
In addition, this warranty is valid only for the original equipment Purchaser.
It is not transferable if the equipment is resold.
EMCIS will not accept liability for equipment faults due to unforeseen and
unusual circumstances, nor for faults due to mishandling by the customer.
WARRANTY
EMCIS Contact
If this equipment develops a fault, contact office of EMCIS at the address
in the operation manual, or your nearest sales or service office.
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Certificate of Compliance
Dear Sir;
We hereby certify that the products are manufactured, inspected, and tested
according to the rule and regulation of EMCIS quality control program
based on ISO9001,version 2000.
With best regards,
EMCIS Co., Ltd.
Quality Control Dept.
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Safety Symbols
Where these symbols or indications appear on the instrument r in this manual, they have the
following meanings.
Caution
Risk of hazard which cause fire or serious damage to
the instrument or other equipment. Do not proceed
until its suitable conditions are met.
Warning
Risk of hazard which cause injury to human body or danger to
Life, if a WARING appears on the instrument, and in this manual,
do not proceed until its suitable conditions are met.
Earth without guide
Earth with guide
Please read this manual before usage
Please keep this manual with the equipment
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Contents
1.0. Introduction of LISN
2.0. Specification
3.0. Packaging
4.0. Installation
5.0. Measurement
6.0. Calibration
Appendix Isolation Transformer
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1.0. Introduction of LISN
EMCIS Model Line Impedance Stabilization Network (LISN) is a channel selectable (one or two)
low pass filter network designed to isolate the equipment under test from an external power source ;
to measure conducted emission from power lines.
The LISN must maintain characteristic impedance to the EUT and isolate the EUT from unwanted
RF signals on both the DC and AC power source while allowing the necessary voltage and current
to be delivered to the EUT.
The LISN provides a 50Ω output impedance for measurement of RF emissions produced by the
EUT.
The impedance versus frequency of an LISN must match the requirements of the test specification
being applied to the EUT.
LN2-50N and EMCIS LISN attributes are defined in CISPR 16-1-2.
The most widely used LISN's present a 50Ωimpedance to the EUT. The 50Ω impedance was
selected because theoretical and empirical data have shown that the power circuitry statistically
looks like a 50Ω impedance to standard electronic equipment and RF test equipment is typically
designed for 50Ωinput. The bandwidth is typically determined by the operating frequency of
the potential victims of the EUT's conducted emissions.
The majority of conducted emissions measurements are carried out form 150 kHz to 30 MHz. This
insures that electronic equipment do not interfere with VLF, HF radio communication systems as
well as other electronic devices operating at this frequency.
EMCIS LISN has its own special parameter.
There are two type of LISN being used; One has one line connection port with line selection
switch(or without switch) and another one has two ports linking two lines simultaneously and
continuously. To cover both cases, EMCIS LISN has two group of selection button.
In performance and operation, there are no difference comparing with currently used LISN
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2.0. Specification
MODEL LN4-50N
Frequency Range 9kHz~30MHz
Power in/output Terminal Type
Artificial Hand 220pF +510Ω
Supply Line/Phase 2 / 1
Network Inductance 50Ω/50uH + 5Ω + 250uH
Coupling Capacitor 0.25uF
Max. Current 50A
Max. Voltage AC 250V
Power frequency DC~60Hz
Output mode Test, Analysis
RF output BNC 50Ω
Dimension W30 D705 H262 (mm)
Weight 30 kg
Environmental Specification
Installation Indoor usage only
Operation Temperature/Humidity +5 ~ 40°C / 20%~80% RH
Storage Temperature/Humidity -20 ~ +65°C / 20%~80% RH
EMCIS’s Own Function
Test Mode Line 1,2 (same as conventional LISN)
Analysis Mode Common-Mode and Differential-Mode
(used with EMCIS’ EMI Analyzer)
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Front Panel
① Analysis signal output terminal ② RF(Noise) signal output terminal
③ RF Line selection button ④ Analysis selection button
⑤ Output terminal cap ⑥ Artificial hand
⑦ Ground terminal ⑧ EUT power terminal
⑨ Calibration ground terminal
Rear Panel
① Input terminal CAP ② Ground terminal
③ Input terminal
Don’t use Output/Input Terminal for moving the instrument. They could be broken
easily. For moving, use grip bars on both side of the instrument.
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3.0. Packaging
When receive the products, please check the packing list and match it with actual items in the
package.
Please check the conditions of items; any damage, attachment, and looks is properly good.
Description Quantity Remark
Main body 1 set Serial No.
Manual 1 ea
Calibration Jig 1 ea CA-002-LISN
Table 1. Standard products package
# This packing list is based on standard package
Each purchased list shall be different according to the contract.
# Please contact if there are any missing parts.
4.0. Installation
Any use of the LISN without proper earth connection is strictly
Warning prohibited. Due to the high leakage current to ground inherent to
this type of equipment, it is necessary to install a supplement
protective earthing wire from the protective earth terminal on the
front(rear) panel of the LISN to an appropriate earthing point of the
power mains.
If the main line is equipped with the fault current protection switch,
recommended to use an isolation transformer between main outlet and
the LISNs.
4.1. Protective earth connection
LISN is provided with earth connectors in the rear panel. The ground connection
between the LISN and the ground plate must be as short as possible and no inductive. The
earth point should be determined by an electrician authorized to do such work by
appropriate code or law.
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4.2. Main Supply
Over current protection is not provided in the LISN
Warning LISN must be connected to a power mains which has the
properly rated mains protection installed.
Input power connection is made through the properly rated power cords meet the related
specification.
4.3. Measuring instruments connection
It is advisable to connect the input and output connectors to
Caution their proper power lines and loads before connecting to the measuring
instrument. Otherwise, it is possible to damage the mixer or
attenuators of the test instruments due to power surges or transients.
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5.0. Measurement
5.1. RF Mode
LN2-50N is connected to measuring instrument, EMI Receiver or Spectrum Analyzer
through BNC connector on the front panel.
Select RF Mode, Line1 or Line2
It is normal to choose the highest noise line for your test results.
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5.2 Analysis Mode
Based on EMCIS’ own technology, LN2-50N works with EMI ANALYZER to separate
Common-Mode noise and Differential-Mode noise.
Analysis Mode has two output ports to measure Common noise and Differential noise.
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6.0. Calibration
Before calibration, to abvoid electric shock or damage to the instruments, power off the
instrument.
LN2-50N Calibration Jig (CA-002-LISN)
Calibration Jig Connection
LISN’s calibration has to meet the impedance curve specified in CISPR 16. Because it is needed
to get the same result even in changed places or repeated tests.
LISN needs the exclusive jig for calibration.
Output BNC for measuring is terminated with 50Ω resistor and measure separately L1 and L2.
For the detailed impedance measurement, sweep measuring is needed. Calibration at a few
frequency may not show all the characteristic of LISN.
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220V
110V
110V
L
G
N
220V
220V
0V
L
G
N
Appendix Isolation Transformer
It is much recommended to check the currently used electricity and to use Isolation transformer if
the electricity is not in ‘not recommended’ condition
Required electricity condition for LISN / noise measurement
Wrong electricity in measurement and for LISN
Standard Isolation Transformer circuit
220V
L
N
110
V G
110
V
220V