17 | Keysight | InfiniiVision 6000 X-Series Oscilloscopes - Data Sheet
New Standard for Price Performance: Bandwidth, Visualization, and Integration
Integration (Continued)
Spectrum analysis and Multi-domain analysis:
Enhanced color FFT function with peak search
The enhanced color FFT takes your experience of oscilloscope-
based spectrum analysis to the next level.
– Color grade immediately shows you the frequency and
amplitude distributions of your signal.
– The frequency peak search eliminates tedious cursor
measurements.
– The peak search event lister provides frequency and
amplitude information for up to 11 peaks, sorting them in the
order of the frequency or the amplitude.
– Set frequencies in “start and stop” or “center and span.”
– FFT max hold, min hold, and frequency average plots are also
available through the math functions. Displays up to four
functions simultaneously.
Figure 36. Enhanced color FFT with an automatic peak search and FFT
histogram turned on. Min/max hold and average FFT also available.
Multi-domain time correlated measurements with
Gated FFT
The new problem solving feature called “gated FFT” lets you
time correlate the analog, digital, and frequency domain to aid in
analysis and debug. When the gated FFT is on, the oscilloscope
goes into zoom mode. The FFT analysis shown in the zoomed
(bottom) window is taken from the period of time indicated by
the zoom box in the main (top) window. Touch and move/flick the
zoom box through the acquisition to investigate how the spectrum
components change over time, correlating the RF phenomenon
with the analog and digital signals.
Figure 37a shows the Gated FFT correlating the turn-on of a PLL
with an associated SPI command and the spectrum contents
at a given time (the boxed area in the top/main window). By
moving the Gated FFT zoom box, you can quickly see the
spectrum contents at another time slot. Note, unlike the scopes
with the RF input, you can actually see the RF signal in the time
domain (channel 4 magenta trace) to quickly grasp its amplitude
information as well.
Figure 37a. Gated FFT time correlating the PLL voltage, SPI command
and spectrum content at a given time span.
Figure 37b shows the Gated FFT correlating the FSK frequency
hop from 400 kHz to 3.2 MHz and its related I2C command. Again,
the Gated FFT revealed the relationship of the hopping signal to
the control command (I2C).
Figure 37b. Gated FFT time correlating the FSK frequency hopping with
an I2C command (write 7 at 0x71 data 10).
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