Keysight InfiniiMax III+ Series, User Manual

Page: 109 / 162

Performance Plots
6
InfiniiMax III+ Series Probes User’s Guide 109
Figure 85 Step Response of Corrected System
Since the corrected system response has flat magnitude and phase, the step
response is very flat and has equal pre-shoot and over-shoot. The flat phase will
not distort the phase of the signal under test and therefore provides the truest
reproduction of the signal. The reflection at 1.5 ns (twice the electrical length of
the probe head) is very small indicating that the probe amplifier input termination
is good.
The measure of the quality of a probe system is how well it reproduces the signal
at the probe tip on the oscilloscope screen. Figure 86 on page 110 shows the step
response of the 6.6 GHz BW signal in red, and blue shows how well the probe
system reproduces that step. The BW of the signal being measured is as high as it
can be while limiting the measured rise time error to about 3%.