21
Operating the Probe
130 ohm Resistive Signal Pin (orange) and Solder-down Ground Lead
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 measured by double probing with an Agilent 54701A
probe into an Agilent 54750A oscilloscope (total 2.5 GHz BW). Eye Scan is 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 130
Ω
resistive signal pin (orange) and solder-down ground lead
configuration.
Step input measurement schematic
The following graphs demonstrate the logic analyzer's probe response to
different rise times. These graphs are included for you to gain insight into the
expected performance of the different recommended configurations.
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
Summary of Contents for E5382A
Page 4: ...4 Contents ...
Page 5: ...1 General Information ...
Page 13: ...2 Operating the Probe ...
