Keysight Technologies C Series - About Electromagnetic Interference (EMI) Measurements; EMI Measurement Features (Option 361)

Keysight N9915-90020 User’s Guide 343
Electromagnetic Interference (EMI) Measurements – Option 361
About Electromagnetic Interference (EMI) Measurements
About Electromagnetic Interference (EMI) Measurements
EMI mode enables you to make the following types measurements:
— Radiated – wireless EMI signals
— Conducted – emissions from wires or other conducted paths.
Some measurement parameters are auto-coupled and are not user-settable.
EMI Measurement Features (Option 361)
The EMI Resolution bandwidth is auto-coupled to keep frequency range
with the selected CISPR band. If the Start or Stop frequencies are
changed, the FieldFox displays a reminder message about the CISPR band
limits.
Example of CISPR messages: “CISPR band StartFreq limited to
30000000" and “CISPR band StopFreq limited to 300000000".
In the CISPR Band Scan measurement, the Span can be changed. (Exception:
CISPR Zoom Scan cannot change the Span.) As the SPAN changes, the resultant
trace point quantity also changes proportionally, since every FFT spectral sample
measured undergoes detection by the FieldFox firmware and becomes part of the
trace (Maximum points == 75001). Learn more, see
“CISPR (International
Special Committee on Radio Interference) Control” on page 331
.
When selected, CISPR Band and Zoom Scan measurements use one of the
5 CISPR band frequency ranges to set the frequency range (Start and
Stop) on the FieldFox. CISPR Zoom Scan selects a limited fix span (<entire
band range). Learn more, see
“Resolution Bandwidth (Res BW)” on
page 336
and “How to set Frequency Range and Frequency Context” on
page 329
.
Hint!
With any of the EMI measurement settings described in this section, you
can toggle Zero Span and back (i.e., back to your previous measurement)
using the “Zero / Last Span” softkey. Learn more, see
“How to set
Frequency Range and Frequency Context” on page 329
.
For EMI measurements mode, this section defines the four trace state
choices for the Fast SA Scan trace display states and for CISPR Band
Scan, CISPR Zoom Scan, and APD Statistics choices, it defines the 4th
trace display state choices. Learn more, see
“How to set the EMI Traces”
on page 339
.