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 : emcis@emcis.co.kr

- 1 -

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

2

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.

User Guide – Line Impedance Stabilization Network

3

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.

User Guide – Line Impedance Stabilization Network

4

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

User Guide – Line Impedance Stabilization Network

5

Contents

1.0. Introduction of LISN

2.0. Specification

3.0. Packaging

4.0. Installation

5.0. Measurement

6.0. Calibration

Appendix Isolation Transformer

User Guide – Line Impedance Stabilization Network

6

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

User Guide – Line Impedance Stabilization Network

7

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)

User Guide – Line Impedance Stabilization Network

8

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.

User Guide – Line Impedance Stabilization Network

9

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.

User Guide – Line Impedance Stabilization Network

10

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.

User Guide – Line Impedance Stabilization Network

11

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.

User Guide – Line Impedance Stabilization Network

12

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.

User Guide – Line Impedance Stabilization Network

13

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.

User Guide – Line Impedance Stabilization Network

14

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