Keysight Technologies C Series - Page 332

332 Keysight N9915-90020 User’s Guide
Electromagnetic Interference (EMI) Measurements – Option 361
EMI Measurements Mode Settings
—Press Measure 1 > Measurement [Fast SA Scan] then choose:
— Fast SA Scan – (Default) Sets the Fast SA Scan. Fast SA Scan applies
peak detection and is used to do a quick verification of your EMI
measurement setup check similar to a normal SA speed sweep.
Pk
annotation is displayed when enabled.
—
CISPR Band Scan – Sets the primary EMI measurement which:
sweeps over the specified CISPR band frequency range, uses CISPR
defined specific EMI 6 dB Resolution bandwidths ((200 Hz, 9 kHz,
and 120 kHz), and 1 MHz impulse bandwidth), with 3 specific
detectors (Positive Peak, EMI Average, or Quasi Peak) which can be
independently set per Trace. Individual trace annotation is displayed
for the three traces (P, Q, and A). See also,
“How to set the EMI
Traces” on page 339
.
—
CISPR Zoom Scan – When set, behaves the same as CISPR Band
Scan, except it represents the minimum Span setting, for any EMI
resolution bandwidth selected, where the RF tuning can remain
stationary (i.e., like Zero Span). While in CISPR Zoom Scan, you
cannot change the Span, because it is meant to provide the fastest
updates of the CISPR bandwidths and Detectors while targeting a
specific RF frequency within the current CISPR band (i.e.,
A/B/C/D/E). Individual trace annotation is displayed for the three
traces (P, Q, and A) and
ZSpan is displayed in the lower right side of
the display. See also,
“How to set the EMI Traces” on page 339.
—
APD Statistics – Sets a measurement that evaluates pulses
statistically. APD statistics is essentially a Zero Span measurement of
the Center Frequency. APD statistics uses a specific APD 6 dB
resolution bandwidth (APD Res BW) to measure the power level
detected while creating a histogram of those power levels over the
APD Dwell Time. Next APD Statistics uses that histogram data to
create a set of values to define that probability that the signal power
is above a certain level (CCDF == complementary cumulative density
function). The graphical axis changes radically, to reveal that
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
.