Atec Solar-Electronics-LISN-Stabilization Networks User Manual download pdf

LINE IMPEDANCE STABILIZATION NETWORKS

APPLICATION

When measuring conducted radio interference

voltages from active power lines to ground, it is

essential to know the line impedance so that

repeatable tests can be made by more than one

laboratory.Artiﬁcial line impedances are speciﬁed

in MIL-STD-462, V.D.E., C.I.S.P.R., C22.4, NACSEM

5100, ANSI C63.2 and other EMI speciﬁcations.

The characteristic impedance of the five

microhenry and 50 microhenry LISNs brackets

the mean value of power line impedance which

has been measured by independent researchers.

These two inductance values in parallel with

the 50 ohms of the EMI meter fall between the

minimum and maximum line impedance values

which have been measured. The mean value

would be represented by a twenty microhenry

inductor in parallel with100 ohms.

DESCRIPTION

The Solar Electronics LISNs use a series inductor

between the test sample and the power source

to provide the impedance-versus-frequency

characteristic. A coaxial connector with d.c.

isolation is provided for connection to the

associated frequency selective EMI meter. The

power source end of the inductor is bypassed

to ground.

Due to the large current-carrying capability of

some LISNs, it is not always practical to use

a switch for changing inductance values.

Instead, some models are equipped with a high

current pin plug-and-jack combination for quickly

connecting and disconnecting a network and

substituting another.This nylon insulated pin plug

and jack arrangement is a safety feature, well

isolated from inadvertent short circuits, providing

protection to operating personnel.

Current ratings up to 200 amperes are available in

50 H styles and 500 amperes in 5 H styles. See

the chart on the following page.

When measurements are made in a shielded

room, the LISNs intended for F.C.C. applications

will also serve for V.D.E. tests. When operating on

an unfiltered power line, the V.D.E. specifications

require a filter consisting of 250 microhenry

inductor and a capacitor. This ﬁlter is included in

the 24 ampere LISN, Type 9348-50-R-24-BNC,

and the 50 ampere LISN, Type 8602-50-TS-50-N.

EMI specifications require one LISN in each

ungrounded power lead.Even though the neutral

is considered “ground,” if it is not connected to

chassis inside the unit under test, the lead must

be tested with an LISN. Therefore, use two LISNs

in d.c. or single phase a.c. applications,three LISNs

for delta-connected three phase circuits, and four

LISNs for ‘Y’ connected three phase circuits.

Explanation of Type Numbers

8602-50-TS-50-N

R.F. connector style

Current rating, amperes

Terminals: TS = T

erminal Screw

PJ = P

lug and Jack

Series inductance, microhenries

Basic model number

1 2 3 4

APPLICATION 1
DESCRIPTION 1

Summary of Contents

Page 1 - DESCRIPTION

LINE IMPEDANCE STABILIZATION NETWORKSAPPLICATIONWhen measuring conducted radio interferencevoltages from active power lines to ground, it isessential

Page 2

LINE IMPEDANCE STABILIZATION NETWORKS Current Inductance Line/Ground Voltage Case Type Number Amps H 50-60 Hz 400 Hz Size* Circuit

Page 3

LINE IMPEDANCE STABILIZATION NETWORKS (cont.) Current Inductance Line/Ground Voltage Case Type Number Amps H 50-60 Hz 400 Hz Size* C

Page 4

LINE IMPEDANCE STABILIZATION NETWORKS (cont.) Current Inductance Line/Ground Voltage Case Type Number Amps H 50-60 Hz 400 Hz Size* C

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Atec Solar-Electronics-LISN-Stabilization Networks User Manual

Browse online or download User Manual for Equipment Atec Solar-Electronics-LISN-Stabilization Networks. Atec Solar-Electronics-LISN-Stabilization Networks User Manual

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