Above: EMI Diagnostic Measurement Setup: Spectrum Analyzer, Preamplifier, Close-Field Probe
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Do-It-Yourself Loop (H-Field) Probes -- a few examples
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How to make a simple loop probe
Above: A DIY loop probe. Get Electronic
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How to make a “Mini” loop probe
Above: Bend center conductor of a thin coax cable into
a small loop and solder it to the braid. Then cover with silicon sealer.
Loop Probes you can buy
Above: Commercial probes are available many Internet
sources. EMC probes allow the accurate measurement of magnetic and electric
fields. They are useful for EMC troubleshooting, field strength measurement, and troubleshooting of RF circuits.
How to Map Hot (trouble) Spots on PCBs (printed circuit boards)
Above: LEFT: (top)1/2 inch magnetic field probe (used for course measurements) and (bottom) “Micro” magnetic field probe (used for fine measurements); RIGHT:
Hot spots found on a common PC motherboard: examples include various crystal
oscillators, processor chips; cable harmonics, PLL (phase lock loops), etc.
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Easy-to-Perform Precompliance Testing and Troubleshooting | A Current Probe used to Measure a Cable's Common-Mode Currents |  |