Specifications
10
Analysis tools: PrecisionProbe (option 001)
Turn your 90000 X-Series oscilloscope into a time-domain transmissometry (TDT) and
quickly characterize and compensate any input into your scope.
PrecisionProbe technology turns
your oscilloscope into the ultimate
characterization tool. Not only can you
do the normal de-embedding through
InfiniiSim, PrecisionProbe allows quick
characterization of your entire probe
system (including cables and switches)
without the need for extra equipment.
PrecisionProbe takes advantage of the
fast “cal output” signal on the 90000
X-Series to characterize and compen-
sate for loss on the measurement
system.
PrecisionProbe technology:
• Properly creates custom probe
transfer function =VOut / VIn
• Properly characterizes probed
system transfer function such that
VOut / VInc = VOut / VSrc
• Removes unwanted S21 cable
insertion loss
PCI Express measurement comparisons
Root complex device Eye height (mV) Eye height PrecisionProbe Gain
2.5 GT/s_12 GHz 517.19 553.94 7.1%
5 GT/s_12 GHz_3.5 dB 312.22 348.19 11.5%
5 GT/s_12 GHz_6 dB 341.1 376 10.2%
5 GT/s_16 GHz_3.5 dB 306.6 348.33 13.6%
5 GT/s_16 GHz_6 dB 344.4 374.41 8.7%
8 GT/s_12 GHz_P7 96.83 103.09 6.5%
8 GT/s_12 GHz_P8 100.16 108.33 8.2%
8 GT/s_16 GHz_P7 96.92 106.01 9.4%
8 GT/s_16 GHz_P8 100.24 108.24 8.0%
By characterizing and compensating for cable loss on the cable connected to the PCI
Express test fixture, the designer was able to gain between 6.5% and 13.6% margin
that would have been lost otherwise.
Now every probe and cable in the system
can have the exact same frequency
response – probe to probe or cable to
cable – without measurement variation
caused by probe variation. Now you can
properly characterize custom probes.
In addition to characterizing the cables,
PrecisionProbe allows for immediate use
on the same instrument. PrecisionProbe
saves you time and money while increas-
ing your measurement accuracy.
When you combine InfiniiMax probes
with switches between the amplifier and
the probe head, PrecisionProbe allows
for full correction and automation of
each probe’s path. Full automation is
then available to allow for quick swap-
ping of the inputs via Infiniium’s compli-
ance framework. For increased accuracy,
purchase PrecisionProbe Advanced for
faster edge speeds and true differential
measurements.
Agilent’s uses Indium Phosphide to
procuce a sub 12 ps edge perfect for
characterizing cable and probe frequency
response