Wolfspeed SPEEDVAL KIT HALF-BRIDGE MOD-MB-HB-0900V-40A User Manual page 52

F 53: P
IGURE OWER
3. No current waveform
 If utilizing the CT method for measuring I
plug that passes the current through one of the recommended high-bandwidth current
transformers. See section 5.4 for further instructions.
 If using the high-resistance shunt method, verify that the MMCX to BNC adapter is
connected to the I
4. Distorted gate waveforms seen on oscilloscope.
On occasion, V or gate waveforms may appear distorted (Figure 54). There are several
GS
connections in the gate measurement path. If one is not solidly connected, it may result in
distorted gate waveforms. Check the following:

X10 oscilloscope probe tip to BNC coupling
 Probe BNC coupling to 6" BNC to MMCX adapter
 6" MMCX adapter to power daughter card MMCX test point
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
are the property of their respective owners and do not imply specific product and/or vendor endorsement,
sponsorship or association.
D C W
AUGHTER ARD AVEFORMS
DS
test point on the power daughter card.
DS
V
GS
F 54: D
IGURE ISTORTED
SpeedVal Kit™ Half-Bridge User Guide
O D P
PTIMIZED FOR OUBLE
, confirm that connector CON11 is mated with a
V W
GS AVEFORM
T
ULSE ESTING
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