ETS-Lindgren 7405 E & H Near Field Probe Set - Manual (Page 41)

www.ets-lindgren.com Common Diagnostic Techniques 41
 Reducing the signal voltage swing: This will be ineffective when the
radiating potential is developed deep in the circuitry, not at the output
signal driver. At times the radiating potential will be built up on the
power or ground system through the additive effects of a number of
gates. Therefore, suppression of any one of these gates in isolation will
not yield much signal reduction.
 Shielding the entire loop: A problem arises when deciding where to
ground the shield. The radiating potential is on signal ground, but if you
tie the shield to signal ground, you ultimately add more radiating
antenna to the system.
 Filtering the signal line: A problem arises when deciding where to
ground the filter. Using signal ground will be ineffective because the
filter will float with the radiating potential.