product id: 72811
For accurate power measurements, it is extremely important to equalize the time delay between voltage and current probes. The U1880A deskew fixture allows you to drive both your voltage and current probes with the same pulse signal. Probe deskew can then be performed with the power measurements application software, or may be performed manually on the oscilloscope.
A power measurement is simply a point-by-point multiplication of the voltage and current waveforms measured by the voltage and current probes. To make accurate power measurement and calculation, it is extremely important to equalize the time delay between the voltage and current probes using a procedure known as deskewing. This step is critically important since a small offset in the timing of the voltage and current traces can cause a large error in the instantaneous power reading. To deskew a pair of probes, drive both voltage and current probes with the same pulse signal using the U1880A deskew fixture. With only a single click on the menu, deskewing is automatically performed and its values are saved in the power measurement software, so the next time you launch the power measurement application, you can use the saved deskew values or perform the deskewing again.
The deskew accuracy is a function of the electrical characteristics of the voltage and current probes as well as the risetime of the signal under test. In general, higher bandwidth probes will allow for better risetime fidelity and better deskew resolution. Keysight's N2790A to N2793A differential probes are recommended for most applications.
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