3000T Datasheet, PDF (14/40 Pages) Keysight Technologies – InfiniiVision 3000T X-Series Oscilloscopes

14 | Keysight | InfiniiVision 3000T X-Series Oscilloscopes - Data Sheet
Solve: Dedicated Frequency/Spectrum Analysis Allows you to Time-Correlate
Analog, Digital, and frequency Domain Signals in a Single Instrument
Viewing the frequency content of waveforms is greatly simplified by a dedicated FFT
button and level adjustment knobs. Pop up keypads make inputting start, stop, span and
center frequency easy. And the new problem solving feature called “gated FFT”, unique
in this class of instrument, lets you time correlate the analog, digital, and frequency
domain to aid in analysis and debug. In addition, there are new capabilities for peak
searching, max and min hold and averaging of FFTs to increase dynamic range.
When 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. In the gated FFT mode, touch and flick the zoom box through
the acquisition to investigate how the FFT analysis changes over time, correlating the RF
phenomenon with the analog and digital phenomenon.
Figure 21a through 21d show a simple gated FFT example observing a RF signal
frequency transition from 400 MHz to 200 MHz, time correlated to both the SPI
controlling signal (digital) and a VCO enable signal (analog). Note, you can also visualize
the RF signal itself in the time domain to gain additional insight such as a gap in the RF
time domain waveform.
Figure 21a. Triggered on a SPI command, the RF signal is still at 400 MHz Figure 21b. No RF activities in this zoomed time.
as indicated in the frequency peak search result lister.
Figure 21c. Start observing the RF signal at 200 MHz. You can validate
this from the RF analog waveform as well.
Figure 21d. RF signal settled down at 200 MH as indicated in the search
lister.