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SDS2000X HD Series Digital Oscilloscope User Manual
2 3 6 i n t . s i g l e n t . c o m
Switching Loss
Switch loss analysis can be used to calculate the power dissipated in the switching period.
Deskew Calibration
A relatively small skew can cause a large measurement error of switching loss, especially during the
on phase when the voltage is close to zero and the non-on phase when the current is close to zero.
This is a typical oscilloscope dynamic range limitation when trying to measure weak voltage and (or)
current in the presence of relatively large switching voltage and (or) current.
To correct the skew between the oscilloscope channels or probes, the deskew procedure should be
performed once initially, and re-run when any part of the hardware setup changes (for example, a
different probe, different oscilloscope channel, etc.) or when the ambient temperature changes. The
deskew procedures by using the DF2001A deskew fixture are as follows:
A. Demagnetize and zero-adjust the current probe
B. Set up connections to the DF2001A deskew fixture
Small Loop Large Loop
Available current
probes
CP4020 (100 kHz,20 Arms)
CP4050 (1 MHz,50 Arms)
CP4070 (150 kHz,70 Arms)
CP4070A (300 kHz,70 Arms)
CP5030 (50 MHz,30 Arms)
CP5030 (100 MHz,30 Arms)
CP5150 (12 MHz,150 Arms)
CP5500 (5 MHz,500 Arms)
High-voltage
differential probe
sense points
J7: signal terminal
J6: earth terminal
J3: signal terminal
J4: earth terminal
a. Connect D+ and D- of the high-voltage differential probe to J7 and J6
b. Connect the current probe to the loop with the direction of the arrow indicating the
direction of the current flow
c. Make sure the switch S1 on the deskew fixture is set to the appropriate side of the
fixture (either “small loop” or “large loop”)
d. Connect the deskew fixture to a USB port on your oscilloscope or a PC using a USB
cable. The USB port supplies power to the deskew fixture
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