Elektor 19869 Podręcznik użytkownika - Strona 4

Przeglądaj online lub pobierz pdf Podręcznik użytkownika dla Przyrządy pomiarowe Elektor 19869. Elektor 19869 5 stron. 150 khz – 200 mhz

Drukuj stronę

Measurement description

The network simulation "Dual DC LISN" is used to measure the conducted

interference emissions of a test object in the frequency range of 150 kHz

up to 200 MHz. The device based on the CISPR 25 / ISO 7637 standard for

automotive electrical systems. It measures the RF interferences on both

channels of such systems by using blocking inductance of 5μH.

The measurement should do in following steps:

DUT (device under test) and LISN placed on a conducted plane

›

ISN inserted between power supply and DUT

›

DUT connection should be not more than 50cm and straight above the

›

plane

Connect RF output A to analyzer for measuring the differential mode

›

noise from positive line or to output B to analyze the negative line

For measuring the common mode noise additional hardware is needed

›

Because of strict symmetrical construction to both RF-outputs it is possible

to extract both kinds of distortion DM and CM. There is a need of passive

combiner circuits (e.g. Minicircuits ZSCJ-2-2+ (DM) and ZSC-2-2+ (CM)) to

measure this on a receiver (e.g. Spectran). Other solutions are possible. A

second solution is to use an oscilloscope with dual input and mathematics

(add, FFT). The results are similar to an EMI receiver.

User manual Dual DC LISN 150 kHz – 200 MHz | Assembly of the KIT

4/5

Safety arrangement

In case of using this document and referred information (weblinks at the

end of this document) to build this device for own usage, please keep in

mind to save your own health.

Urgent advice:

Read all documents.

›

Follow the safety instructions and warnings.

›

The device is only allowed to use for measurement applications that

›

are specified. Other usage is forbidden.

Essential safety instructions

1. Please only use in inside rooms. For the power supply refer to the

technical characteristics.

2. The product may only be used by authorized technical staff. The local

or country-specific safety and accident prevention regulations must be

observed for all work.

3. During operation of the product, function-related increased

electromagnetic radiation and near fields can occur. Taking into

account the increased need for protection of unborn life, pregnant

women should be protected by suitable measures. People with

pacemakers can also be at risk from electromagnetic radiation. The

influence of electronic products outside of the operational EMC

environment should be prevented by maintaining an appropriate safety

distance or by using shielded rooms.

4. Products / components must not be operated electrically, mechanically

and / or thermally beyond their intended use.

5. To ensure proper operation, no changes may be made to the device.

6. Do not use the product under conditions in which condensation could

or has occurred in or on the product, e.g. when the product has been

moved from a cold to a warm environment.

7. Please only use neutral detergents for cleaning. Never use alcohol,

benzene or thinner.