Chapter 1 1-7
Installing Your Analyzer
STEP 5. Install Ferrite Cores
STEP 5. Install Ferrite Cores
CISPR 11 is an international regulation that specifies the maximum level of frequency
emissions that can originate from an electronic device. The regulation is designed to
minimize the interference that one electronic device may have with another.
Frequency emissions can occur when cables are connected to an electronic device. To
minimize this, try to use high-quality cables with built-in molded ferrite cores, with the
core closest to the PNA. If cables with built-in cores cannot be found, use one of the
clamp-on ferrite cores that are included with the PNA.
It is especially important to use these cores on cables that are connected to the following
PNA connectors:
• Parallel Port (rear panel)
• Serial Port (rear panel)
• VGA (rear panel)
• Probe power (front panel)
The core should snap closed to grip the cable firmly, but without damaging the cable.
Attach the core to the cable as close as possible to the PNA connector end. Cable ties are
included to help ensure that the ferrite cores remain in place.
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