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6
Performance Plots
InfiniiMax III+ Probe System Responses
InfiniiMax III+ high-bandwidth active probes for use with Infiniium real-time
oscilloscopes utilize DSP correction filters to enhance the accuracy of
measurements. InfiniiMax III+ probe amplifiers store their unique s parameters in
on board memory for the scope to readout when needed. Probe heads are simple
passive devices and, with careful manufacture, their s-parameters don't vary
significantly so they are stored as nominal s-parameters in the oscilloscope.
When a probe is connected to an oscilloscope channel and the proper probe head
is selected, the oscilloscope calculates a DSP correction filter that includes the
probe head, probe amplifier, and oscilloscope channel. This provides the maximum
measurement accuracy for the complete probe and scope channel system.
Since there are so many different probe amplifiers and probe head combinations, it
is not reasonable to show the responses of all these combinations and the
responses would all be very much the same because they are all corrected to same
target system response. The target system response is a flat magnitude, flat phase
response high order low-pass filter that maximizes measurement accuracy.
Figure 84
N2836A solder-In probe head used with an N2832A 13 GHz InfiniiMax III+ probe
amplifier.
Figure 84 Corrected System Frequency Response (N2836A Solder-In Head and N2832A
108
shows an example of corrected system frequency response of an
Figure 85
on page 109 shows the step response of the corrected system.
Amplifier)
InfiniiMax III+ Series Probes User's Guide
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