How to choose and use the EMI tester

EMI tester can be used to test and evaluate the anti-interference ability of the electromagnetic environment where the electrical equipment is located, and it is also one of the main standards for testing product quality. Therefore, in the current market, the scope of use of such tester is also very wide. As operators and users, it is necessary to have a reasonable understanding of the selection and use of EMI tester. Next, let’s have some knowledge about this.

As for the selection method of EMI tester, the certification authority will select fully compatible EMI testing equipment. This kind of tester can provide a fully compatible test scheme: keysight EMI receiver is configured with corresponding EMI test software n6141 series, which has built-in multiple specification requirements. The EMI receiver has a preselector required for EMC full compatibility test.

Compared with the full compatibility test, the pre compatibility test is a work of the customer’s self-test. Before the electronic products to be released are sent to the EMC certification authority, the product shall be tested to see whether it meets the EMC standards. If the test fails, the customer will check the product, conduct fault analysis, positioning, improvement, etc., to ensure that the product meets the requirements of EMC specifications.

How to use EMI tester:
First, when the EMI tester measures the signal, first tune the instrument to a certain measurement frequency fi, which enters the mixer after passing through the high-frequency attenuator and the high-frequency amplifier, and mixes with the frequency f1 of the local oscillator to generate many mixed signals. Only if fo = F1 FI is obtained after the IF filter. The IF signal is detected by the envelope detector after passing through the if attenuator and if amplifier, and the IF signal is filtered to obtain the low-frequency signal a (T). A (T) is further subjected to weighted detection, and the geophone is selected as required to obtain the peak value, effective value, average value or quasi peak value of a (T). These values can be displayed on the digital tube screen after being amplified at low frequency.

Second, the EMI tester measures the signal voltage input to its terminal [1]. In order to measure the field strength or kilodisturbance current, a transducer is required. With the help of its conversion coefficient, the measured port voltage is converted into the field strength (unit: u v / m or DB V / M), current (unit: A, DB u a) or power (unit: W, dbmw). The transducer can be an antenna, a current probe, a power absorption clamp or a power supply impedance stabilization network according to the different measurement objects.

After the above introduction, I believe we have a certain understanding of the selection and use of EMI tester. LISUN Launched EMI receiver system for EMI (Electromagnetic Interference) radiation conduction or conducted emissions testing. The EMI-9KB EMI receiver is produced by the full closure structure and strong electro-conductibility material, which has high shielding effect. Due to the new technology for the EMI Test System, it solved the instrument self-EMI problem. The test results are according to the international format test report. The EMI Test System EMI-9KB fully meets CISPR15:2018, CISPR16-1, GB17743, FCC, EN55015 and EN55022.

EMI-9KB EMI Test Receiver

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

Our main products are Goniophotometer, Integrating Sphere, Spectroradiometer, Surge Generator, ESD Simulator Guns, EMI Receiver, EMC Test Equipment, Electrical Safety Tester, Environmental Chamber, Temperature Chamber, Climate Chamber, Thermal Chamber, Salt Spray Test, Dust Test Chamber, Waterproof Test, RoHS Test (EDXRF), Glow Wire Test and Needle Flame Test.

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