Agilent Technologies InfiniiVision 6000 Series User Manual page 341

6000 Series Oscilloscope User's Guide
Figure 49 DC and Low-Frequency Probe Equivalent Circuit
250 W
1 pF
Figure 50 High-Frequency Probe Equivalent Circuit
The impedance plots for the two models are shown in these
figures. By comparing the two plots, you can see that both the
series tip resistor and the cable's characteristic impedance
extend the input impedance significantly. The stray tip
capacitance, which is generally small (1 pF), sets the final break
point on the impedance chart.
8.5 pF 100 kW
7.5 pF
100 kW
Reference 8
150 W
341