Keysight Technologies C Series - Attenuation Control; CISPR (International Special Committee on Radio Interference) Control

Keysight N9915-90020 User’s Guide 331
Electromagnetic Interference (EMI) Measurements – Option 361
EMI Measurements Mode Settings
Attenuation Control
Learn more, refer to “Attenuation Control” on page 161.
CISPR (International Special Committee on Radio Interference)
Control
This section describes the FieldFox EMI measurement mode’s instrument
controls for evaluating pre-compliance EMI of the equipment under test.
After EMI mode is selected or after a Mode Preset, the Measure menu is
displayed. Two primary controls are available:
CISPR band and Measurement – there are 5 CISPR bands (A/ B/ C/ D/ E)
which, when selected, automatically set the instrument to a CISPR defined
frequency range and CISPR defined measurement bandwidth. Learn more, see
“Resolution Bandwidth (Res BW)” on page 336.
For this section, refer to
Figure 12-1 on page 333, Figure 12-2 on page 334,
Figure 12-4 on page 335, and Figure 12-5 on page 335.
This section contains:
—
“How to Set the EMI Measurement Settings (Fast SA Scan, CISPR Band
Scan, CISPR Zoom Scan, and APD Statistics)” on page 331
— “How to set a CISPR Band” on page 333
Learn more, see “How to set the EMI Traces” on page 339.
How to Set the EMI Measurement Settings (Fast SA Scan, CISPR Band
Scan, CISPR Zoom Scan, and APD Statistics)
Screen defaults to Log sweep, but you can toggle using Freq/Dist > Zero/Last
Span. Learn more, see “Frequency Range” on page 328 and “How to set the
EMI Traces” on page 339
.
Point quantities are not manually controllable within CISPR Band Scans or
CISPR Zoom Scans. Rather, they are automatically derived from the
bandwidths and Spans being used. CISPR Band E requires the most points
to achieve the full band scan, but in all cases, total point quantity will not
be allowed to exceed 75001. For manually coupled EMI Resolution BW,
this hard limit on point quantity results in Span limitations (e.g., If the 9
kHz BW is used in CISPR band E, the hard point limit will cause the Span to
be limited far short of the expected 17 GHz full range of CISPR band E).