Quick Reference 2
Keysight InfiniiVision DSOX1204A/G Oscilloscopes User's Guide 73
Frequency Response Analysis
On G-suffix oscilloscope models (that have a a built-in waveform generator), the
Frequency Response Analysis (FRA) feature controls the built-in waveform
generator to sweep a sine wave across a range of frequencies while measuring the
input to and output from a device under test (DUT). At each frequency, gain (A)
and phase are measured and plotted on a frequency response Bode chart.
When the frequency response analysis completes, you can move a marker across
the chart to see the measured gain and phase values at each frequency point. You
can also adjust the chart's scale and offset settings for the gain and phase plots.
Table 22 Frequency Response Analysis Features
Feature Front Panel Key/Softkey Location (see built-in help for more information)
Frequency Response
Analysis (FRA)
enable/disable
[Analyze] > Features, Entry knob to select Frequency Response Analysis, push Entry knob to
enable or disable
Channels probing DUT
input V and output V
[Analyze] > Setup > Sources > Input V
[Analyze] > Setup > Sources > Output V
Frequency sweep min
and max values
[Analyze] > Setup > Min/Max Freq, Entry knob
Waveform generator
amplitude and
expected output load
[Analyze] > Setup > Amplitude, Entry knob
[Analyze] > Setup > Output Load (50
Ω, High-Z)
Points per decade [Analyze] > Setup > Pts Per Decade (10, 20, 30, 40, 50)
Run the analysis [Analyze] > Run Analysis
Frequency Response Analysis automatically changes the acquisition mode during the sweep to
provide a good balance between a clean signal and high throughput at each frequency. For most
frequencies, averaging is enabled with a varying number of averages.
Adjust scale and offset
of Bode plots
[Analyze] > Chart > Gain/Phase Scale/Offset, Entry knob
Gain, Phase, or both
plots in chart
[Analyze] > Chart > Trace (Gain, Phase, both)
Autoscale gain and
phase plots
[Analyze] > Chart > Autoscale
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