Kyoritsu

EMI ABSORBING CLAMP 　KT-10
BOROCHURE PDF 320KB .
This EMI absorbing clamp is used with an EMI receiver to measure the RF interference power radiated from electrical equipments through the mains cable or other wirings.

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This measuring method is based on the method adopted by CISPR.
A current probe built in the clamp is  coupled to the mains cable and picks up the interference signal from equipment under test.
The output voltage from the clamp is measured with an EMI receiver and the interference power can be found from the following formula:
P = V + K
where

　P = Interference Power ( dB value with 0dB as 1pW )
　V = Measured Voltage with EMI receiver ( dB value with 0dB as 1μV )
　K = Correction Factor ( dB )

Note 1 :　The EMI receiver used with should have an input impedance of 50 ohm and its specifications should comply with CISPR requirements.

Note 2 :　This clamp has amazing decoupling performance down to lower frequency. This advantage is useful not only for EMI measurement but also for immunity measurement to reduce the influence of the interference from mains line.

Decoupling Factors (DF) based on CISPR are as follows:
　Typical DF with one clamp :   2dB at 150kHz,  13dB at 1MHz,  24dB at 30MHz
　Typical DF with two clamps :  4dB at 150kHz,  19dB at 1MHz,  39dB at 30MHz
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Specifications
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Frequency range

30〜1000 MHz

Output terminal load impedance

50Ω (input impedance of EMI receiver used)
Size of measurable mains cable

Up to 20mm diameter  (outside dimension including covering)

Dimensions

636(W) X 75(H) X 90(D) mm

Weight

5.5kg

Accessory

Coaxial cable (BNCP-3D2W-NP, 5m)
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AUXILIARY ABSORBING CLAMP 　KT-20
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This is an absorbing device used with an EMI absorbing clamp when measuring the RF interference power radiated from electrical equipments through the mains cable or other wirings.

This device realize the stable measurement by reducing the unnecessary interference for measurement coming from a mains supply side, and by improving load impedance stability at the same time.

This application is also recommended to use in the measuring method by CISPR.

This device uses the same absorbing materials (which are ferrite rings) as the materials used for EMI absorbing clamp KT-10. So, the same high quality of decoupling attenuation (Decoupling Factor) can be expected.

And installations of the cable under test are so convenient as the construction of absorbing materials is clamp-on type.

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