Keysight Technologies E5400-Pro Series, User Manual

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Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 57
Operating the E5402A, E5405B, and E5406A-Pro Series Probes 4
Step Inputs
Maintaining signal fidelity to the logic analyzer is critical if the analyzer is
to accurately capture data. One measure of a system's signal fidelity is to
compare V
in
to V
out
for various step inputs. For the following graphs, V
in
is
the signal at the logic analyzer probe tip. Eye Scan was used to measure
V
out
, the signal seen by the logic analyzer. The measurements were made
on a mid-bus connection to a 50 Ω transmission line load terminated at the
receiver. These measurements show the logic analyzer's response while
using the E5402A, E5405B, and E5406A-pro series soft touch probes.
Figure 35 Step input measurement schematic (E5402A, E5405B, and E5406A)
The following plots were made on a Keysight 54750A oscilloscope and a
Keysight 16760A logic analyzer using a Keysight 8133A pulse generator
with various rise time converters.
E5382A
Probe
Z0=50
Ω
Rterm
Driver Receiver
Rsource
Step
output
50
Ω
Z0=50
Ω
50
Ω
Logic
Analyzer
w/ EyeScan
Oscilloscope
2.5GHz BW
incl. probe
54701A
Probe