Keysight Technologies B1505A User Manual page 238

Measurement Examples
Gate Charge Measurement
The result of the Qg (JESD24-2 High Id + JESD24-2 High Vds) shows the gate
charge characteristics extracted from the high current and high voltage measurement
results.
For the Qg (R Load High Id + JESD24-2) and Qg (High Vds + JESD24-2), you can
also observe the switching waveforms as shown below.
1. Click the Results button at the lower position of the main screen to show the
pull-down menu, and then select Filter > Expand Application Test Results to
activate this function.
2. Select a measurement result of the Qg (High Id Switching) or Qg (High Vds
Switching) in the list of the Results. And then, right-click it to open the pop-up
menu, and select the Display Data. The switching waveforms are displayed in
the Data Display window.
Adjusting the Measurement Condition
The charging interval on the gate charge characteristics increases in proportion to
the switching speed. If the charge interval is too long, decrease the gate current Ig.
5-20 Keysight B1505A User's Guide, Edition 12