Deskew - Wolfspeed SPEEDVAL KIT HALF-BRIDGE MOD-MB-HB-0900V-40A User Manual

A. Deskew
Deskewing is critical to making accurate double pulse measurements. Taking double
pulse measurements on a setup that has not been properly deskewed can result in errors
of more than 100%. Figure 31 shows the connections for deskewing the setup.
I. Deskew Setup
Select A Control Option
1. External Function Generator
 Connect function generator to "LS IN" BNC connector
 Set the two 3-pin jumpers near the BNC connectors to the "BNC" setting
2. Control Card
 Plug a control card into the control card slot. Ensure firmware has been loaded
per instructions in user guide.
 Connect control card to PC to operate the program
 Set the two 3-pin jumpers near the BNC connectors to the "CTRLR" setting
II. Deskew Procedure

This test is necessary to perform before running DPT to ensure V
channels are time-aligned in order to get accurate switching loss measurements.
 Ensure the power daughter card has been configured per the user guide to use a high-
resistance current shunt or two-stage CT in order to get accurate results.
PRD-06829 REV. 1, December 2022
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SpeedVal Kit™ and Wolfspeed logo is a trademark of Wolfspeed, Inc. Other trademarks, product and company names
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sponsorship or association.
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IGURE PEED AL IT
SpeedVal Kit™ Half-Bridge User Guide
D
ONNECTIONS FOR ESKEW
and I scope
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