For sake of checking that a loop current actually exist, a monitoring current probe is added, near the injection probe.
But when monitoring the injected current, do not try re-adjusting the current for maintaining the calibration value. Let the bundle current establish by itself, depending on the actual impedance of the cable-to-ground loop.
- Exes and Ohs.
- Planet Analog - EMC Basics #8: An introduction to troubleshooting EMI problems (con't) -.
- EMI and signal integrity for PCB design - EE Publishers.
- Wine of Battle.
What counts is that the induced open-voltage keeps the value that was set during calibration. EMI problems occuring in the field are a difficult challenge. This is a case where there is very little possibility, if at all, for modifying the equipment. Reasons for this are multiple:.
In many cases, we have found that rushing to a problem site because the user is pressing you may induce two mistakes:. Thus you will bring whatever is necessary to complement the instrumentation available on site. Does it have power line filters, with CM and DM elements? Are they bonded to a chassis or a grounded metal plate, and correctly mounted no input and output wires entangled together?
Examine all of them. Are there some power and signal bundles running thightly close to each other, or near to other power cables carrying large currents? If so, where and how are the shields grounded? Are they in metal raceways, with continuous metal-to-metal bonding all along? By this, we mean that the problem is always present or repeats within a reasonable observation period, such as it can be probed and quantified: If it has been checked that the equipment is in otherwise good condition, a continuously occuring problem is a blessing of sorts, since it eases-up the search for the source and the subsequent fixes.
A procedure is recommended on Fig. Once if the source has been identified, the likely coupling path s can be identified by a quick measurement of the Common Mode HF currents at the following locations:. Make sure that the culprit source is functionning when you make your measurement.
Upon the results of this CM current survey on all cables, a further investigation can lead to identify the cable s that is the likely coupling path for the problem. Brand new book, sourced directly from publisher. Dispatch time is working days from our warehouse. Book will be sent in robust, secure packaging to ensure it reaches you securely. Language: English. Brand new Book. Seller Inventory APC Book Description Condition: New. Seller Inventory n. Book Description Shipping may be from multiple locations in the US or from the UK, depending on stock availability.
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Practical Aspects of EMI Protection - Maxim
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Practical tips for troubleshooting EMI issues
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