Difference between revisions of "Does RadiMation support the linearity check described in the EN 61000-4-3 standard"

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(New page: The EN 61000-4-3 standard describes how Radiated Immunity tests should be performed. In this standard it is also described how the calculation of a Uniform Field Area should be per...)
 
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# Open the results of the substitution test, open the forward power graph, and copy the data of the forward power to the clipboard.
 
# Open the results of the substitution test, open the forward power graph, and copy the data of the forward power to the clipboard.
 
# Paste the forward power of the substitution test into the Microsoft Excel worksheet (for example on cell E1)
 
# Paste the forward power of the substitution test into the Microsoft Excel worksheet (for example on cell E1)
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# Compare the data of the forward power of the calibration and the forward power during the substitution. The forward power of the substitution should be 5.1 dB lower then the forward power of the calibration file.
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# Compare the data of the forward power of the calibration and the forward power during the substitution. The forward power of the substitution should be 5.1 dB lower then the forward power of the calibration file. The comparison is very easy, by inserting the formula '=B2-E2' in cell I2. The formula can then be copied down for all other frequencies.
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# The [[EN 61000-4-3]] standard assumes that the amplifier  
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# The [[EN 61000-4-3]] standard assumes that the amplifier is not in saturation if the difference between the forward power values is within +3.1 dB to +5.1 dB.
  
  
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Another possibility to ensure that the amplifier is not used in saturation, is to limit the generated power of the amplifier to the 1 dB compression point. The [[amplifier limitation]] feature of {{RadiMation}} can be used to limit the generated power of the amplifier.
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The standard des
 
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for the tests contains a description of the uniform field, which specifies that at least 12 of the 16 calibration points should be within a -0 dB to +6 dB tolerance. A bigger tolerance (from -0 dB to +10 dB) is allowed for a maximum of 3% of the calibration frequencies.
 
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The Uniform Field Area calculation, first normalizes the power levels of all the frequencies in the selected calibration point calibration files, to the electrical field strength for which the Uniform Field Area is calculated. Every calibration file, has small deviations in the measured field strength on each frequency. It is for example possible that a 10.4 V/m (with a forward power of 56.3 dBm) is measured during the calibration of a 10 V/m field strength. This small deviation is normalized to exactly 10 V/m, by adjusting the forward power level to 56.0 dBm (more exact: 55,95933321 dBm). It is necessary to normalize the forward power levels because the differences (0.35 dB in this example) can have it's influence in the reduction of the calibration points.
 
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The 2006 version of the standard describes a method for the reduction of the calibration points, which is exactly the same as the method that is described in the 2002, Amendment 1 version of the standard.
 
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RadiMation® performs this calculation method as it is described in the standard. There is no difference in the calculation of the 2002, Amendment 1 and the calculation of the 2006 version. RadiMation® will perform the Uniform Field Area calculation exactly the same for both these versions.
 
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The 2006 version of the standard also specifies that the calibration should be performed on a field strength that is at least 1.8 times higher than the field strength that will be used during the substitution test. It is also stated that it has to be ensured that the amplifier is not used in a range in which it is saturated. The standard suggests that this can best be achieved by one of the following procedures:
 
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    * Use the final calibration result file, to perform a signal generator level substitution test on a field strength level that is 1.8 times lower than the calibrated field strength. The forward power of the calibration file, and the forward power during the substution test should then be within 3.1 dB to 5.1 dB difference.
 
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    * Determine the 1 dB compression point of the amplifier, and ensure that the amplifier is not used above the determined 1 dB compression point. However due to impedance mismatches during the compression point calibration and the field strength calibration, this 1 dB compression point calibration is still no 100% guarantee that the amplifier is not used without saturation. In this case it is accepted that the 2 dB compression point of the amplifier is used as the maximum forward power level of the amplifier during the field strength calibration.  
 
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[[Category:RadiMation]]
 
[[Category:RadiMation]]
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[[Category:Report generator]]
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[[Category:RadiMation FAQ]]

Revision as of 16:12, 14 January 2009

The EN 61000-4-3 standard describes how Radiated Immunity tests should be performed. In this standard it is also described how the calculation of a Uniform Field Area should be performed. In the 2006 version of the EN 61000-4-3 standard, it is also described that it should be ensured that the amplifier is used in a range in which it is not in saturation. Does RadiMation® support the linearity check as it is described in the EN 61000-4-3, 2006 version?


The EN 61000-4-3 specifies that the calibrations in the Uniform Field Area should be performed on electrical field strength that is at least 1.8 times higher than the field strength that will be used during the substitution test. To be able to perform substitution tests on 10 V/m, it is thus necessary that the calibrations are performed on 18 V/m. The Uniform Field Area calculation can be performed as it is described in Chapter 12. After the the complete calculation has been performed, and a final calibration file has been created, it has to be ensured that the amplifier will not be used in saturation.

The easiest way to confirm that the amplifier is not used in saturation, is:

  1. Configure a Radiated Immunity substitution test with the calibration file that was the result of the Uniform Field Area calculation. Ensure that the substitution test is configured with the correct settings:
    • use the signal generator calibration method.
    • level to an electrical field strength that is 1.8 times lower than the field strength that was calibrated. This will result in a 5.1 dB lower signal generator power.
    • use the same frequency range and frequency steps, as was used during the calibration.
  2. Start the substitution test and wait until it is finished.
  3. Now the forward power that is used during the substitution test, and the forward power during the calibration should be compared. It is the most easiest to do this in Microsoft Excel. Start Microsoft Excel, and create an empty sheet.
  4. Open the calibration file that was the result of the Uniform Field Area calculation.
  5. Open the forward power graph, and copy the data of the forward power to the clipboard.
  6. Paste the forward power of the calibration file into the Microsoft Excel worksheet (for example on cell A1)
  7. Open the results of the substitution test, open the forward power graph, and copy the data of the forward power to the clipboard.
  8. Paste the forward power of the substitution test into the Microsoft Excel worksheet (for example on cell E1)
  9. Compare the data of the forward power of the calibration and the forward power during the substitution. The forward power of the substitution should be 5.1 dB lower then the forward power of the calibration file. The comparison is very easy, by inserting the formula '=B2-E2' in cell I2. The formula can then be copied down for all other frequencies.
  10. The EN 61000-4-3 standard assumes that the amplifier is not in saturation if the difference between the forward power values is within +3.1 dB to +5.1 dB.


Another possibility to ensure that the amplifier is not used in saturation, is to limit the generated power of the amplifier to the 1 dB compression point. The amplifier limitation feature of RadiMation® can be used to limit the generated power of the amplifier.

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