Keysight Technologies B1505A User Manual page 230

Measurement Examples
Gate Charge Measurement
Preparing Measurement Setup
Used Application Test: Qg (R Load High Id + High Vds+ JESD24-2)
1. Set the InCaseOfError parameter to Continue to prevent an abort of the
automatic test execution when an error occurs on a device test. You can set this
in the Extended Setup dialog box opened by the Extended Setup ... button.
2. Specify an approximate expected total gate charge value to the QgMaxXAxis
parameter and specify an expected threshold voltage to the VgsTh parameter.
3. Specify the On current to the IdOn parameter according to your switching
condition. For the VdsOff parameter, specify the upper limit value to
automatically search for the load voltage when the On current flows to the active
DUT.
4. Specify the measurement range of the gate voltage using the VgsOff and VgsOn
parameters.
Performing the Measurement
1. Click the Repeat button. This opens the Repeat Measurement Setup
dialog box.
2. Specify the prober driver programs to be used to the Start Procedure, Iteration
Procedure, and Final Procedure fields, and then check the Automatically fill in
Device ID.
3. Uncheck the Counter Reaching to in the Repeat Stop Condition area.
4. Click the Run button to start the repeat measurement.
Checking the Measurement Result
After each measurement, the gate charge characteristics will be displayed on the
Data Display window. After all measurements, you can view each measurement
result on the Data Display window.
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.
5-12 Keysight B1505A User's Guide, Edition 12