N2808A Datasheet, PDF (5/13 Pages) Keysight Technologies – PrecisionProbe for the 9000 Series

05 | Keysight | N2808A PrecisionProbe for the 9000 Series - Data Sheet
PrecisionProbe Correction (Probes)
Two methods exist for correcting probe responses,
Vout/Vin and Vout/Vsource
Vout/Vin correction
Vout/Vin characterizes the output of the probe as a function
of the input at the probe tips. Defining the response this way
allows you to evaluate the probe’s accuracy in reproducing the
actual signal present in your system with the probe attached.
This correction is known as Vout/Vin, which is what you’d see
with a real band limited probe that has finite input impedance.
PrecisionProbe corrects the “Vout/Vin” response to be flat with
frequency and phase to your defined bandwidth limit. It does not
correct the loading effects of the probe. It should be noted that
Keysight’ s probe frequency response corrections are typically
defined using Vout/Vin.
Vout/Vsource correction
The second way to correct probes is an estimate known as Vout/
Vsource, this method corrects the probe as “what would be there
if the probe were not present.” There are oscilloscope and probe
manufacturers that design their probes and DSP correction
software to display what the waveform “would have been” in
the absence of the probe. One drawback of defining the probe’s
response in this manner is that if the probe’s loading causes your
circuit to lose some timing or amplitude margin, you probably
want to know that when you make a measurement. Vout/Vsource
compensation will hide these effects from you. PrecisionProbe
also gives you the freedom to choose this method of correction,
which can be effective if probing at the transmitter.
Figure 6. A probe that has perfect transfer function shows an exact copy of a signal at the input. A probe that has a perfect system response shows the
signal at the input of probe boosted by the estimate amount of loading due to the probe.