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SIGLENT
SDS2000X User Manual 171
To Perform Channel Deskew
To make accurate power loss measurements, current and voltage channel deskew using
the DF2001A deskew fixture must be performed. The channel deskew procedure
calibrates the time delay between the current and voltage probes. This step is critical . 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.
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.
To deskew, perform the following steps:
1. First, demagnetize and zero-adjust the current probe.
2. Set up connections to the DF2001A deskew fixture:
Small Loop
Large Loop
Available current
probes
CP4020(100KHz,20Arms)
CP4050 (1MHz,50Arms)
CP4070 (150kHz,70Arms)
CP4070A(300kHz,70Arms)
CP5030 (50MHz,30Arms)
CP5030A (100MHz,30Arms)
CP5150(12MHz,150Arms)
CP5500 (5MHz,500Arms)
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 the deskew fixture.
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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