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Electromagnetic Interference (EMI) Measurements – Option 361
EMI Measurements Mode Settings
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
page 326
page
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
Frequency Range and Frequency Context" on page
— Press Measure 1 >
322
and
"How to set Frequency Range and Frequency Context" on
319.
Measurement [Fast SA Scan]
—
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.
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,
Traces" on page
328.
—
CISPR Zoom Scan
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
the display. See also,
—
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
"Resolution Bandwidth (Res BW)" on
– When set, behaves the same as CISPR Band
ZSpan
is displayed in the lower right side of
"How to set the EMI Traces" on page
Keysight N9938-90006 User's Guide
"How to set
319.
then choose:
Pk
"How to set the EMI
328.
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