EMC radiation test

Radiation measurement test Electromagnetic radiation test is the most common type of test. The radiation emission test is measured for the emission electromagnetic field generated in the measured equipment. In order to cover the frequency range of the entire interested, several different antennas may be required. The measurement of the strong value of the radiation launch field is as follows. 1. Keep an antenna to maintain an appropriate distance from a devices. Typically, this distance depends on the test standard of 3 meters, 10 meters or 30 meters. 2. Place the antenna on the product to be tested. This includes a bored direction and polarization (polarity). 3. Use low VSWR, low-loss coaxial cable connect the output of the receiving antenna to the input of the receiving system (spectrum analyzer) for the measurement field. Enter the impedance receiving system, both the received antenna should match 50. If most antennas are EMI / EMC antennas, most antennas have been matched with this impedance, and most of the receiving systems should be the same. If this is not this, the reading will need to correct the impedance without match. 4. Select the frequency of interest on the receiving system. Make sure the receiving antenna provides accurate measurements at this frequency. This includes ensuring that the antenna can receive signals of the frequency of interest within the design frequency range provided by the manufacturer, and ensure that the antenna has been properly calibrated at this frequency. 5. Measure the RF voltage VA of the reference receiving system. The unit should be referred to 1 minivolt, decibel branch, if the unit is absolutely metapultto (depending on the receiving system used), they should be converted. The conversion factor is as follows, but more information on the conversion (and other useful formulas associated with RF). VA (DBV) = 20Log 10 [VA (V)] 6. Once the reading is converted to DB microvolve (DBV), it can be added to the antenna coefficient to determine the field strength. Calibration or newly purchased antenna with an antenna coefficient. If you don't know the antenna coefficient of the antenna, you can use a typical value to approximate the field strength, but in development, this is unacceptable for formal consistency testing. Field strength (DBV / M) = RF voltage (DBV) + antenna coefficient (db / m) EA (DBV / M) = VA (DBV) + AF (db / m) Remember to include all losses of the cable between the antenna and the receiving system and any gain when using the pre-placed amplifier. The above formula, including cable loss and preamplifier gain, nowcomes ... EA (DBV / M) = VA (DBV) + AF (DB / M) + Cable (DB) + G Pre-amplifier (DB)

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