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Page

 

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of

 

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INSTRUCTION

 

MANUAL

 

FOR

 

LI

215A

 

LINE

 

IMPEDANCE

 

STABILIZATION

 

NETWORK

 

(LISN)

 

 

114

 

OLINDA

 

DRIVE

 

 

BREA,

 

CALIFORNIA

 

92823

 

 

(714)

 

528

8800

 

fax

 

(714)

 

528

1992

 

 

com

power.com

 

REV043013

 

7.0

  

LISN

 

Theory

 

 

7.1

 

Overview

 

 

Line

 

Impedance

 

Stabilization

 

Networks

 

used

 

supply

 

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

215A

 

consists

 

of

 

two

 

separate

 

LISN

 

networks

 

housed

 

in

 

a

 

single

 

enclosure

 

for

 

testing

 

EUTs

 

with

 

single

 

phase

 

power

 

requirements

 

down

 

to

 

9

 

kHz.

  

 

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

 

effect.

   

This

 

filter

 

comprises

 

of

 

two

 

stage

 

low

 

pass

 

LC

 

filters.

 

Therefore,

 

there

 

are

 

two

 

capacitors

 

and

 

two

 

inductors

 

for

 

the

 

filters.

 

The

 

two

 

inductors

 

used

 

in

 

the

 

LI

215A

 

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

 

RF

 

noise.

  

The

 

insertion

 

loss

 

of

 

the

 

measured

 

noise

 

may

 

be

 

significant

 

at

 

low

 

frequency.

 

Therefore,

 

at

 

frequencies

 

below

 

400

 

kHz,

 

the

 

insertion

 

loss

 

correction

 

factor

 

must

 

be

 

compensated

 

for

 

highest

 

accuracy

 

noise

 

measurement.

 

 

The

 

schematic

 

of

 

the

 

LISN

 

as

 

well

 

as

 

line

 

impedance

 

is

 

specified

 

in

 

the

 

ANSI

 

C63.4

 

as

 

CISPR

16

1

2

 

standards.

 

A

 

typical

 

circuit

 

diagram

 

of

 

an

 

LISN

 

is

 

given

 

in

 

Figure

 

1

 

below.

 

Figure

 

1

 

 

Example

 

of

 

an

 

equivalent

 

LISN

 

circuit

 

 

 

 

Summary of Contents for LI-215A

Page 1: ...OR LI 215A LINE IMPEDANCE STABILIZATION NETWORK LISN 114 OLINDA DRIVE BREA CALIFORNIA 92823 714 528 8800 fax 714 528 1992 com power com REV043013 INSTRUCTION MANUAL For LINE IMPEDANCE STABILIZATION NETWORK Model LI 215A 9 kHz to 30 MHz ...

Page 2: ...lable from Com Power 5 4 0 Important Safety Precautions 6 5 0 Warranty 7 5 1 Maintenance 7 6 0 Front and rear panel marking 8 6 1 Power input port 8 6 2 EUT power port 8 6 3 EMI measurement Port 8 6 4 Test lead selection switch Line LI or Neutral L2 8 6 5 Grounding bolt GND 8 7 0 LISN Theory 9 7 1 Overview 9 Figure 1 Example of an equivalent LISN circuit 9 8 0 Typical Performance Data 10 Figure 2 ...

Page 3: ...ications safety precautions product maintenance and warranty information It also includes some basic guidance on properly configuring calibration test setup running test level calibrations and performing conducted emissions testing Information contained in this manual is the property of Com Power Corporation It is issued with the understanding that none of the material may be reproduced or copied ...

Page 4: ...e impedance during Electromagnetic Compatibility EMC testing in accordance with FCC CISPR and CE requirements In addition it minimizes the noise generated by equipment other than the EUT to be included in the measurement Standard items included Equipment accessories and documents supplied with the model LI 215A LISN are as follows o User s guide o AC Power cord o Calibration data and Certificate t...

Page 5: ... 50 µH Internal line termination Yes 50 Ω EUT Power Connector NEMA 5 15R receptacle Power input connector IEC 60320 Inlet RF measurement connector 50Ω N type female Operating Temperature 5 C to 40 C 40 F to 104 F Mechanical Dimensions L x W x H 17 5 x 13 x 7 5 inches 44 x 33 x 19 cm Weight 28 lb 12 5 kg This equipment is designed for indoor use only 3 1 Other equipment available from Com Power SPA...

Page 6: ...rely bolting the LISN to the ground plane Only connect EUTs with power plug with a protective earth contact should be inserted into LISN power input port The protective action must not be negated by the use of a cheater plug or an extension cord without a protective conductor Maintenance There are no user serviceable parts inside the unit User modifications to the LISNs will void warranty and may ...

Page 7: ...ility 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 seperately 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 In the case of repair or compla...

Page 8: ...l socket socket to power the equipment under test 6 3 EMI measurement Port The 50 Ω Type N connector located to the right of the EUT Power Port is for connecting the Spectrum analyzer or EMI receiver for making conducted noise measurements 6 4 Test lead selection switch Line LI or Neutral L2 This switch allows measurement of noise from each line The line that is not being measured is automatically...

Page 9: ...ks RF noise from the power line from reaching the equipment under test however the power to the equipment passes through the LISN with minimal effect This filter comprises of two stage low pass LC filters Therefore there are two capacitors and two inductors for the filters The two inductors used in the LI 215A are air core type to eliminate the possibility of saturation and to provide stability Th...

Page 10: ...com power com REV043013 8 0 Typical Performance Data Figure 2 Impedance c0mpared to CISPR 16 1 2 and ANSI 63 4 requirements Figure 3 Phase compared to CISPR 16 1 2 requirements 0 10 20 30 40 50 60 70 0 01 0 1 1 10 100 Impedance Ω Frequency MHz CISPR 16 1 2 Limit ANSI 63 4 2009 Limit 20 0 20 40 60 80 0 001 0 01 0 1 1 10 100 Phase Angle degrees Frequency MHz ...

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