This product is no longer in stock
To make accurate power loss measurements, you must perform current and voltage channel deskew using the DF2001A deskew fixture. The channel deskew procedure calibrates the time delay between current and voltage probes. This step is certainly important since a small delay in the timing of the voltage and current traces can cause a large error in the instantaneous power reading.
The deskew accuracy is a function of the electrical characteristics of the voltage and current probes as well as the rise time of the signal under test. In general, higher bandwidth probes will allow better rise time fidelity and better deskew resolution.
You need to perform the deskew procedure once initially, and you should re-run the procedure when any part of the hardware setup changes (for example, a different probe, different oscilloscope channel, etc.) or when the ambient temperature changes.