EMCExplorer-SAAS principles

EMCExplorer-SAAS is based on the following facts and situations:

1.Perform spectrum analysis of a product signal can only acknowledge the EMI strength of a specific frequency, but cannot tell when the EMI occurs and where the location is.

2.The EMI of a specific frequency is not time continuous, it occurs at a particular moment corresponding to a particular point of a signal waveform.

3.The peak value of a specific frequency EMI doesn’t exist continuously on the circuit board; it occurs only on a particular place of the board near to one of the signal waveform test points.

EMCExplorer-SAAS is based on our following research results:

1.Perform a wavelet analysis on a signal can expose where the EMI of a specific frequency is on the signal waveform, change that part of waveform can adjust the EMI level.

2.Perform spectrum analysis to a group of  signals and compare EMI levels of a specific frequency can find out which signal has higher EMI level at that specific frequency, and the point where the signal is tested from is the position where the higher EMI level of a specific frequency occurs on the board.

3.Different wave forms of signals produce different electromagnetic interference which can be heard and identified by human ears by means of our innovative technology "Method for Auscultating Inaudible Signals".

Basic Principles of EMCExplorer-SAAS (A guide to product EMC compliance):

Assume EMC standard lab test shows a equipment’s EMI value of specific frequency exceed the standard, the EUT (Equipment Under Test) can’t achieve the EMC compliance.

1.Measure a group of signal from evenly distributed test points on EUT's circuit board by an oscilloscope and upload the data together with a photo of the EUT to Cloud, to create the user’s workspace on Cloud.

2.Set the signal tested at the power input port of the EUT (one which failed the EMC standard lab test ) as “Reference Signal", and evaluate the EMC status of "Reference Signal" by "EMI evaluation" of this system, and calibrate the "EMI evaluation" results with the test results of the EMC standard lab test;

3.Calculate and compare spectrum of uploaded signals, find out a signal ("signal A") which has the highest EMI level at a specific frequency and is located on a position ("position A") of the board, modify the board around the position A (adjust capacitance, inductance or resistance; modify wiring diagram; replace the IC devices, etc.), then redo the measurement of the signal at the power input port of the EUT by an oscilloscope and re-upload the data, redo the EMI evaluation of the data by "EMI analysis", and compare the results with the "EMI analysis" results of "Reference Signal "  to see whether the EMI level at the specific frequency is reduced or not; if it is reduced, it means the modification is heading in the right direction , otherwise, rollback the modification and try other solutions; going on until the EMI level is largely reduced. Or

4.Perform wavelet analysis to the signal A, to find out a point ("point A") on waveform of the signal where the EMI of the specific frequency belongs to.

5.Monitor the waveform of signal at point A continuously by an oscilloscope and change the circuit board parameter (adjust capacitance, inductance, resistance; modify wiring diagram; replace the IC devices, etc.) until the waveform at point A becomes smooth.

6.Redo the measurement of the signal at the power input port of the EUT by an oscilloscope and re-upload the data, redo the EMI evaluation of the data by "EMI analysis", and compare the results with the "EMI analysis" results of "Reference Signal ". If the comparison results show the EUT‘s EMI level is below EMC standard limitation line, send the EUT to the EMC testing lab for a confirmation test and get EMC certification; otherwise, go back to step 5 or step 3.

Assume EMC standard lab test shows a equipment already achieves EMC compliance, our purpose is to determine after any modification or improvement was made, the EUT still remain compliance with EMC standard, the processing will be more simpler:

1.Have the original equipment as “reference EUT”, and set the signal tested at the power input port of the “reference EUT” as “Reference Signal, RS";

2.Have the modified equipment as “EUT”, and set the signal tested at the power input port of the “ EUT” as “Signal Under Analysis, SUA";

3.Evaluate the EMC status of RS and SUA by "EMI evaluation" of this system. If all peak values of the SUA spectrum are equal to or lower than corresponding peak values of the RS spectrum, the modified equipment is still EMC compliance. Or

4.if a peak value of SUA spectrum is higher than the corresponding peak value of RS spectrum, modification on the SUA for EMI reduction is required until all peak values of the SUA spectrum are equal to or lower than corresponding peak values of the RS spectrum.