AFJ Instruments LT32C/10 Instrukcja obsługi - Strona 12

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SECTION C: LISN SETUP

C.1 • GENERAL

In setting-up the LISN-DUT-Receiver configuration to perform a test, please strictly adhere the

following sequence:

1. Connect the protective earth cable between the rear panel screw (indicated by the DIN

"ground" symbol ), and a suitable reference ground.

2. In case AFJ FFT 3010 EMI receiver or AFJ DDA55 Click Analyser are used, connect the LISN 15-

pin remote control connector on the receivers, to the corresponding 15-pin connector on the

LISN, via the appropriate logic signal cable supplied. In such case, totally automatic control of

the LISN can be achieved, via the instruments software interface. AFJ LISN LT32C/10 offers

current meter to read and measure Switching Operations and EUT absorption current, as per

CISPR 14-1 requirements (see Section E).

3. Connect the DUT power cord to the appropriate LISN power output.

4. Plug the LISN mains cord, into the LISN socket on the rear panel.

5. Plug the mains cord into an appropriate mains outlet (if applicable, an isolation transformer

will be interposed), different from the one used to power any other instrument.

6. Switch the LISN power-on, and power-on the test equipment.

7. Connect the AFJ FFT 3010 EMI receiver (or any other receiver / spectrum analyser) or AFJ

DDA55 Click Analyser N 50Ω coaxial input to the LISN BNC 50Ω coaxial output through

appropriate coaxial cable.

8. Important: the built-in pulse limiter and attenuator introduces 10dB attenuation during

measurement. Such attenuation shall be compensated to get proper results, so it is

recommended to insert a correction factor via the software of the measuring equipment used

together with the LISN, before starting any measuring session.

This correction factor shall be defined with reference to the Voltage Division Factor data of

the certificate of calibration of the LISN:

during conducted emission measurement with AFJ FFT 3010 EMI receiver (or any other

receiver / spectrum analyser), using the data from 9kHz to 30MHz for each phase (L1, L2,

L3 and N);

during click measurements with AFJ DDA55 Click Analyser, using the data of the four

analysis frequencies (150kHz, 500kHz, 1.4MHz and 30MHz) for each phase (L1, L2, L3 and

N).

C.2 • SELECTION OF THE CONDUCTOR UNDER TEST

The "CONDUCTOR UNDER TEST" (L1, L2, L3 and N), can be selected in manual operation of the LISN via

the relevant button on the LISN front panel.

In automatic operation, such selection is performed via or AFJ FFT 3010 EMI receiver either AFJ DDA555

Click Analyser control software.

AFJ LT32C/10 LISN - Operating Manual - rev. 3.8 / 2019-01

Distributed by:

Reliant EMC LLC

3311 Lewis Ave, Signal Hill CA 90755,

408-916-5750, www.reliantemc.com