Keysight Technologies E5400-Pro Series, User Manual

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54 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide
4 Operating the E5402A, E5405B, and E5406A-Pro Series Probes
Time Domain Transmission (TDT)
All probes have a loading effect on the circuit when they come in contact
with the circuit. Time domain transmission (TDT) measurements are useful
for understanding the probe loading effects as seen at the target receiver.
The following TDT measurements were made mid-bus on a 50 Ω
transmission line load terminated at the receiver. These measurements
show how the E5402A, E5405B, and E5406A-pro series soft touch probes
affect an ideal step seen by the receiver for various rise times.
Figure 30 TDT measurement schematic (E5402A, E5405B, and E5406A)
The following plots were made on a Keysight 54750A oscilloscope using
TDT.
50
mV p
er
di
vi
sion
500 ps per division
with probe
without probe